{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-21866", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.781Z", "datePublished": "2025-03-12T09:42:22.587Z", "dateUpdated": "2025-03-24T15:41:37.018Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-03-24T15:41:37.018Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC\n\nErhard reported the following KASAN hit while booting his PowerMac G4\nwith a KASAN-enabled kernel 6.13-rc6:\n\n BUG: KASAN: vmalloc-out-of-bounds in copy_to_kernel_nofault+0xd8/0x1c8\n Write of size 8 at addr f1000000 by task chronyd/1293\n\n CPU: 0 UID: 123 PID: 1293 Comm: chronyd Tainted: G W 6.13.0-rc6-PMacG4 #2\n Tainted: [W]=WARN\n Hardware name: PowerMac3,6 7455 0x80010303 PowerMac\n Call Trace:\n [c2437590] [c1631a84] dump_stack_lvl+0x70/0x8c (unreliable)\n [c24375b0] [c0504998] print_report+0xdc/0x504\n [c2437610] [c050475c] kasan_report+0xf8/0x108\n [c2437690] [c0505a3c] kasan_check_range+0x24/0x18c\n [c24376a0] [c03fb5e4] copy_to_kernel_nofault+0xd8/0x1c8\n [c24376c0] [c004c014] patch_instructions+0x15c/0x16c\n [c2437710] [c00731a8] bpf_arch_text_copy+0x60/0x7c\n [c2437730] [c0281168] bpf_jit_binary_pack_finalize+0x50/0xac\n [c2437750] [c0073cf4] bpf_int_jit_compile+0xb30/0xdec\n [c2437880] [c0280394] bpf_prog_select_runtime+0x15c/0x478\n [c24378d0] [c1263428] bpf_prepare_filter+0xbf8/0xc14\n [c2437990] [c12677ec] bpf_prog_create_from_user+0x258/0x2b4\n [c24379d0] [c027111c] do_seccomp+0x3dc/0x1890\n [c2437ac0] [c001d8e0] system_call_exception+0x2dc/0x420\n [c2437f30] [c00281ac] ret_from_syscall+0x0/0x2c\n --- interrupt: c00 at 0x5a1274\n NIP: 005a1274 LR: 006a3b3c CTR: 005296c8\n REGS: c2437f40 TRAP: 0c00 Tainted: G W (6.13.0-rc6-PMacG4)\n MSR: 0200f932 <VEC,EE,PR,FP,ME,IR,DR,RI> CR: 24004422 XER: 00000000\n\n GPR00: 00000166 af8f3fa0 a7ee3540 00000001 00000000 013b6500 005a5858 0200f932\n GPR08: 00000000 00001fe9 013d5fc8 005296c8 2822244c 00b2fcd8 00000000 af8f4b57\n GPR16: 00000000 00000001 00000000 00000000 00000000 00000001 00000000 00000002\n GPR24: 00afdbb0 00000000 00000000 00000000 006e0004 013ce060 006e7c1c 00000001\n NIP [005a1274] 0x5a1274\n LR [006a3b3c] 0x6a3b3c\n --- interrupt: c00\n\n The buggy address belongs to the virtual mapping at\n [f1000000, f1002000) created by:\n text_area_cpu_up+0x20/0x190\n\n The buggy address belongs to the physical page:\n page: refcount:1 mapcount:0 mapping:00000000 index:0x0 pfn:0x76e30\n flags: 0x80000000(zone=2)\n raw: 80000000 00000000 00000122 00000000 00000000 00000000 ffffffff 00000001\n raw: 00000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n f0ffff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n f0ffff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >f1000000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n ^\n f1000080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n f1000100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n ==================================================================\n\nf8 corresponds to KASAN_VMALLOC_INVALID which means the area is not\ninitialised hence not supposed to be used yet.\n\nPowerpc text patching infrastructure allocates a virtual memory area\nusing get_vm_area() and flags it as VM_ALLOC. But that flag is meant\nto be used for vmalloc() and vmalloc() allocated memory is not\nsupposed to be used before a call to __vmalloc_node_range() which is\nnever called for that area.\n\nThat went undetected until commit e4137f08816b (\"mm, kasan, kmsan:\ninstrument copy_from/to_kernel_nofault\")\n\nThe area allocated by text_area_cpu_up() is not vmalloc memory, it is\nmapped directly on demand when needed by map_kernel_page(). There is\nno VM flag corresponding to such usage, so just pass no flag. That way\nthe area will be unpoisonned and usable immediately."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/powerpc/lib/code-patching.c"], "versions": [{"version": "37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1", "lessThan": "97de5852058a299ba447cd9782fe96488d30108b", "status": "affected", "versionType": "git"}, {"version": "37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1", "lessThan": "f8d4c5b653c1bc0df56e15658bbf64fc359adc4e", "status": "affected", "versionType": "git"}, {"version": "37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1", "lessThan": "6847b3e40bb963e57b61d1cc6fe84cb37b9d3d4c", "status": "affected", "versionType": "git"}, {"version": "37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1", "lessThan": "c905a3053518212a1017e50bd2be3bee59305bb0", "status": "affected", "versionType": "git"}, {"version": "37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1", "lessThan": "2d542f13d26344e3452eee77613026ce9b653065", "status": "affected", "versionType": "git"}, {"version": "37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1", "lessThan": "8d06e9208184b2851fa79a3a39d6860320c8bdf8", "status": "affected", "versionType": "git"}, {"version": "37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1", "lessThan": "2e6c80423f201405fd65254e52decd21663896f3", "status": "affected", "versionType": "git"}, {"version": "37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1", "lessThan": "d262a192d38e527faa5984629aabda2e0d1c4f54", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/powerpc/lib/code-patching.c"], "versions": [{"version": "4.13", "status": "affected"}, {"version": "0", "lessThan": "4.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.291", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.235", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.179", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.130", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.80", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.17", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.5", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/97de5852058a299ba447cd9782fe96488d30108b"}, {"url": "https://git.kernel.org/stable/c/f8d4c5b653c1bc0df56e15658bbf64fc359adc4e"}, {"url": "https://git.kernel.org/stable/c/6847b3e40bb963e57b61d1cc6fe84cb37b9d3d4c"}, {"url": "https://git.kernel.org/stable/c/c905a3053518212a1017e50bd2be3bee59305bb0"}, {"url": "https://git.kernel.org/stable/c/2d542f13d26344e3452eee77613026ce9b653065"}, {"url": "https://git.kernel.org/stable/c/8d06e9208184b2851fa79a3a39d6860320c8bdf8"}, {"url": "https://git.kernel.org/stable/c/2e6c80423f201405fd65254e52decd21663896f3"}, {"url": "https://git.kernel.org/stable/c/d262a192d38e527faa5984629aabda2e0d1c4f54"}], "title": "powerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC", "x_generator": {"engine": "bippy-5f407fcff5a0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B1EDAFBE-4006-4FC2-936C-E204A5C8D988", "versionEndExcluding": "6.1.130", "versionStartIncluding": "4.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A93F3655-6FAF-43B0-8541-A212998F05B8", "versionEndExcluding": "6.6.80", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "15370AEE-6D1C-49C3-8CB7-E889D5F92B6F", "versionEndExcluding": "6.12.17", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "72E69ABB-9015-43A6-87E1-5150383CFFD9", "versionEndExcluding": "6.13.5", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*", "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*", "matchCriteriaId": "66619FB8-0AAF-4166-B2CF-67B24143261D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC\n\nErhard reported the following KASAN hit while booting his PowerMac G4\nwith a KASAN-enabled kernel 6.13-rc6:\n\n BUG: KASAN: vmalloc-out-of-bounds in copy_to_kernel_nofault+0xd8/0x1c8\n Write of size 8 at addr f1000000 by task chronyd/1293\n\n CPU: 0 UID: 123 PID: 1293 Comm: chronyd Tainted: G W 6.13.0-rc6-PMacG4 #2\n Tainted: [W]=WARN\n Hardware name: PowerMac3,6 7455 0x80010303 PowerMac\n Call Trace:\n [c2437590] [c1631a84] dump_stack_lvl+0x70/0x8c (unreliable)\n [c24375b0] [c0504998] print_report+0xdc/0x504\n [c2437610] [c050475c] kasan_report+0xf8/0x108\n [c2437690] [c0505a3c] kasan_check_range+0x24/0x18c\n [c24376a0] [c03fb5e4] copy_to_kernel_nofault+0xd8/0x1c8\n [c24376c0] [c004c014] patch_instructions+0x15c/0x16c\n [c2437710] [c00731a8] bpf_arch_text_copy+0x60/0x7c\n [c2437730] [c0281168] bpf_jit_binary_pack_finalize+0x50/0xac\n [c2437750] [c0073cf4] bpf_int_jit_compile+0xb30/0xdec\n [c2437880] [c0280394] bpf_prog_select_runtime+0x15c/0x478\n [c24378d0] [c1263428] bpf_prepare_filter+0xbf8/0xc14\n [c2437990] [c12677ec] bpf_prog_create_from_user+0x258/0x2b4\n [c24379d0] [c027111c] do_seccomp+0x3dc/0x1890\n [c2437ac0] [c001d8e0] system_call_exception+0x2dc/0x420\n [c2437f30] [c00281ac] ret_from_syscall+0x0/0x2c\n --- interrupt: c00 at 0x5a1274\n NIP: 005a1274 LR: 006a3b3c CTR: 005296c8\n REGS: c2437f40 TRAP: 0c00 Tainted: G W (6.13.0-rc6-PMacG4)\n MSR: 0200f932 <VEC,EE,PR,FP,ME,IR,DR,RI> CR: 24004422 XER: 00000000\n\n GPR00: 00000166 af8f3fa0 a7ee3540 00000001 00000000 013b6500 005a5858 0200f932\n GPR08: 00000000 00001fe9 013d5fc8 005296c8 2822244c 00b2fcd8 00000000 af8f4b57\n GPR16: 00000000 00000001 00000000 00000000 00000000 00000001 00000000 00000002\n GPR24: 00afdbb0 00000000 00000000 00000000 006e0004 013ce060 006e7c1c 00000001\n NIP [005a1274] 0x5a1274\n LR [006a3b3c] 0x6a3b3c\n --- interrupt: c00\n\n The buggy address belongs to the virtual mapping at\n [f1000000, f1002000) created by:\n text_area_cpu_up+0x20/0x190\n\n The buggy address belongs to the physical page:\n page: refcount:1 mapcount:0 mapping:00000000 index:0x0 pfn:0x76e30\n flags: 0x80000000(zone=2)\n raw: 80000000 00000000 00000122 00000000 00000000 00000000 ffffffff 00000001\n raw: 00000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n f0ffff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n f0ffff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >f1000000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n ^\n f1000080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n f1000100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n ==================================================================\n\nf8 corresponds to KASAN_VMALLOC_INVALID which means the area is not\ninitialised hence not supposed to be used yet.\n\nPowerpc text patching infrastructure allocates a virtual memory area\nusing get_vm_area() and flags it as VM_ALLOC. But that flag is meant\nto be used for vmalloc() and vmalloc() allocated memory is not\nsupposed to be used before a call to __vmalloc_node_range() which is\nnever called for that area.\n\nThat went undetected until commit e4137f08816b (\"mm, kasan, kmsan:\ninstrument copy_from/to_kernel_nofault\")\n\nThe area allocated by text_area_cpu_up() is not vmalloc memory, it is\nmapped directly on demand when needed by map_kernel_page(). There is\nno VM flag corresponding to such usage, so just pass no flag. That way\nthe area will be unpoisonned and usable immediately."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/code-patching: Se corrige el impacto de KASAN al no marcar el \u00e1rea de parcheo de texto como VM_ALLOC Erhard inform\u00f3 el siguiente impacto de KASAN al iniciar su PowerMac G4 con un kernel 6.13-rc6 habilitado para KASAN: ERROR: KASAN: vmalloc-out-of-bounds in copy_to_kernel_nofault+0xd8/0x1c8 Write of size 8 at addr f1000000 by task chronyd/1293 CPU: 0 UID: 123 PID: 1293 Comm: chronyd Tainted: G W 6.13.0-rc6-PMacG4 #2 Tainted: [W]=WARN Hardware name: PowerMac3,6 7455 0x80010303 PowerMac Call Trace: [c2437590] [c1631a84] dump_stack_lvl+0x70/0x8c (unreliable) [c24375b0] [c0504998] print_report+0xdc/0x504 [c2437610] [c050475c] kasan_report+0xf8/0x108 [c2437690] [c0505a3c] kasan_check_range+0x24/0x18c [c24376a0] [c03fb5e4] copy_to_kernel_nofault+0xd8/0x1c8 [c24376c0] [c004c014] patch_instructions+0x15c/0x16c [c2437710] [c00731a8] bpf_arch_text_copy+0x60/0x7c [c2437730] [c0281168] bpf_jit_binary_pack_finalize+0x50/0xac [c2437750] [c0073cf4] bpf_int_jit_compile+0xb30/0xdec [c2437880] [c0280394] bpf_prog_select_runtime+0x15c/0x478 [c24378d0] [c1263428] bpf_prepare_filter+0xbf8/0xc14 [c2437990] [c12677ec] bpf_prog_create_from_user+0x258/0x2b4 [c24379d0] [c027111c] do_seccomp+0x3dc/0x1890 [c2437ac0] [c001d8e0] system_call_exception+0x2dc/0x420 [c2437f30] [c00281ac] ret_from_syscall+0x0/0x2c --- interrupt: c00 at 0x5a1274 NIP: 005a1274 LR: 006a3b3c CTR: 005296c8 REGS: c2437f40 TRAP: 0c00 Tainted: G W (6.13.0-rc6-PMacG4) MSR: 0200f932 CR: 24004422 XER: 00000000 GPR00: 00000166 af8f3fa0 a7ee3540 00000001 00000000 013b6500 005a5858 0200f932 GPR08: 00000000 00001fe9 013d5fc8 005296c8 2822244c 00b2fcd8 00000000 af8f4b57 GPR16: 00000000 00000001 00000000 00000000 00000000 00000001 00000000 00000002 GPR24: 00afdbb0 00000000 00000000 00000000 006e0004 013ce060 006e7c1c 00000001 NIP [005a1274] 0x5a1274 LR [006a3b3c] 0x6a3b3c --- interrupt: c00 The buggy address belongs to the virtual mapping at [f1000000, f1002000) created by: text_area_cpu_up+0x20/0x190 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:00000000 index:0x0 pfn:0x76e30 flags: 0x80000000(zone=2) raw: 80000000 00000000 00000122 00000000 00000000 00000000 ffffffff 00000001 raw: 00000000 page dumped because: kasan: bad access detected Memory state around the buggy address: f0ffff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0ffff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 &gt;f1000000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ f1000080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f1000100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== f8 corresponds to KASAN_VMALLOC_INVALID, lo que significa que el \u00e1rea no est\u00e1 inicializada, por lo tanto, no se supone que se use todav\u00eda. La infraestructura de parches de texto de Powerpc asigna un \u00e1rea de memoria virtual usando get_vm_area() y la marca como VM_ALLOC. Pero esa marca est\u00e1 destinada a usarse para vmalloc() y la memoria asignada por vmalloc() no se supone que se use antes de una llamada a __vmalloc_node_range() que nunca se llama para esa \u00e1rea. Esto pas\u00f3 desapercibido hasta el commit e4137f08816b (\"mm, kasan, kmsan: instrument copy_from/to_kernel_nofault\"). El \u00e1rea asignada por text_area_cpu_up() no es memoria vmalloc; se asigna directamente cuando map_kernel_page() la necesita. No hay ninguna marca de m\u00e1quina virtual que corresponda a dicho uso, as\u00ed que simplemente no se debe pasar ninguna. De esta forma, el \u00e1rea no se ver\u00e1 afectada y estar\u00e1 disponible de inmediato."}], "id": "CVE-2025-21866", "lastModified": "2025-03-13T21:13:14.300", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-03-12T10:15:19.800", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d542f13d26344e3452eee77613026ce9b653065"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2e6c80423f201405fd65254e52decd21663896f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6847b3e40bb963e57b61d1cc6fe84cb37b9d3d4c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d06e9208184b2851fa79a3a39d6860320c8bdf8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97de5852058a299ba447cd9782fe96488d30108b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c905a3053518212a1017e50bd2be3bee59305bb0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d262a192d38e527faa5984629aabda2e0d1c4f54"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f8d4c5b653c1bc0df56e15658bbf64fc359adc4e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: powerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC", "id": "2351623", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2351623"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["In the Linux kernel, the following vulnerability has been resolved:\npowerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC\nErhard reported the following KASAN hit while booting his PowerMac G4\nwith a KASAN-enabled kernel 6.13-rc6:\nBUG: KASAN: vmalloc-out-of-bounds in copy_to_kernel_nofault+0xd8/0x1c8\nWrite of size 8 at addr f1000000 by task chronyd/1293\nCPU: 0 UID: 123 PID: 1293 Comm: chronyd Tainted: G W 6.13.0-rc6-PMacG4 #2\nTainted: [W]=WARN\nHardware name: PowerMac3,6 7455 0x80010303 PowerMac\nCall Trace:\n[c2437590] [c1631a84] dump_stack_lvl+0x70/0x8c (unreliable)\n[c24375b0] [c0504998] print_report+0xdc/0x504\n[c2437610] [c050475c] kasan_report+0xf8/0x108\n[c2437690] [c0505a3c] kasan_check_range+0x24/0x18c\n[c24376a0] [c03fb5e4] copy_to_kernel_nofault+0xd8/0x1c8\n[c24376c0] [c004c014] patch_instructions+0x15c/0x16c\n[c2437710] [c00731a8] bpf_arch_text_copy+0x60/0x7c\n[c2437730] [c0281168] bpf_jit_binary_pack_finalize+0x50/0xac\n[c2437750] [c0073cf4] bpf_int_jit_compile+0xb30/0xdec\n[c2437880] [c0280394] bpf_prog_select_runtime+0x15c/0x478\n[c24378d0] [c1263428] bpf_prepare_filter+0xbf8/0xc14\n[c2437990] [c12677ec] bpf_prog_create_from_user+0x258/0x2b4\n[c24379d0] [c027111c] do_seccomp+0x3dc/0x1890\n[c2437ac0] [c001d8e0] system_call_exception+0x2dc/0x420\n[c2437f30] [c00281ac] ret_from_syscall+0x0/0x2c\n--- interrupt: c00 at 0x5a1274\nNIP: 005a1274 LR: 006a3b3c CTR: 005296c8\nREGS: c2437f40 TRAP: 0c00 Tainted: G W (6.13.0-rc6-PMacG4)\nMSR: 0200f932 <VEC,EE,PR,FP,ME,IR,DR,RI> CR: 24004422 XER: 00000000\nGPR00: 00000166 af8f3fa0 a7ee3540 00000001 00000000 013b6500 005a5858 0200f932\nGPR08: 00000000 00001fe9 013d5fc8 005296c8 2822244c 00b2fcd8 00000000 af8f4b57\nGPR16: 00000000 00000001 00000000 00000000 00000000 00000001 00000000 00000002\nGPR24: 00afdbb0 00000000 00000000 00000000 006e0004 013ce060 006e7c1c 00000001\nNIP [005a1274] 0x5a1274\nLR [006a3b3c] 0x6a3b3c\n--- interrupt: c00\nThe buggy address belongs to the virtual mapping at\n[f1000000, f1002000) created by:\ntext_area_cpu_up+0x20/0x190\nThe buggy address belongs to the physical page:\npage: refcount:1 mapcount:0 mapping:00000000 index:0x0 pfn:0x76e30\nflags: 0x80000000(zone=2)\nraw: 80000000 00000000 00000122 00000000 00000000 00000000 ffffffff 00000001\nraw: 00000000\npage dumped because: kasan: bad access detected\nMemory state around the buggy address:\nf0ffff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\nf0ffff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n>f1000000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n^\nf1000080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\nf1000100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n==================================================================\nf8 corresponds to KASAN_VMALLOC_INVALID which means the area is not\ninitialised hence not supposed to be used yet.\nPowerpc text patching infrastructure allocates a virtual memory area\nusing get_vm_area() and flags it as VM_ALLOC. But that flag is meant\nto be used for vmalloc() and vmalloc() allocated memory is not\nsupposed to be used before a call to __vmalloc_node_range() which is\nnever called for that area.\nThat went undetected until commit e4137f08816b (\"mm, kasan, kmsan:\ninstrument copy_from/to_kernel_nofault\")\nThe area allocated by text_area_cpu_up() is not vmalloc memory, it is\nmapped directly on demand when needed by map_kernel_page(). There is\nno VM flag corresponding to such usage, so just pass no flag. That way\nthe area will be unpoisonned and usable immediately."], "name": "CVE-2025-21866", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-03-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21866\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21866\nhttps://lore.kernel.org/linux-cve-announce/2025031218-CVE-2025-21866-11c0@gregkh/T"], "threat_severity": "Low"}