{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-21852", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.779Z", "datePublished": "2025-03-12T09:42:07.175Z", "dateUpdated": "2025-03-24T15:41:23.733Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-03-24T15:41:23.733Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Add rx_skb of kfree_skb to raw_tp_null_args[].\n\nYan Zhai reported a BPF prog could trigger a null-ptr-deref [0]\nin trace_kfree_skb if the prog does not check if rx_sk is NULL.\n\nCommit c53795d48ee8 (\"net: add rx_sk to trace_kfree_skb\") added\nrx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL.\n\nLet's add kfree_skb to raw_tp_null_args[] to let the BPF verifier\nvalidate such a prog and prevent the issue.\n\nNow we fail to load such a prog:\n\n libbpf: prog 'drop': -- BEGIN PROG LOAD LOG --\n 0: R1=ctx() R10=fp0\n ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21\n 0: (79) r3 = *(u64 *)(r1 +24)\n func 'kfree_skb' arg3 has btf_id 5253 type STRUCT 'sock'\n 1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1)\n ; bpf_printk(\"sk: %d, %d\\n\", sk, sk->__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24\n 1: (69) r4 = *(u16 *)(r3 +16)\n R3 invalid mem access 'trusted_ptr_or_null_'\n processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\n -- END PROG LOAD LOG --\n\nNote this fix requires commit 838a10bd2ebf (\"bpf: Augment raw_tp\narguments with PTR_MAYBE_NULL\").\n\n[0]:\nBUG: kernel NULL pointer dereference, address: 0000000000000010\n PF: supervisor read access in kernel mode\n PF: error_code(0x0000) - not-present page\nPGD 0 P4D 0\nPREEMPT SMP\nRIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\nCall Trace:\n <TASK>\n ? __die+0x1f/0x60\n ? page_fault_oops+0x148/0x420\n ? search_bpf_extables+0x5b/0x70\n ? fixup_exception+0x27/0x2c0\n ? exc_page_fault+0x75/0x170\n ? asm_exc_page_fault+0x22/0x30\n ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\n bpf_trace_run4+0x68/0xd0\n ? unix_stream_connect+0x1f4/0x6f0\n sk_skb_reason_drop+0x90/0x120\n unix_stream_connect+0x1f4/0x6f0\n __sys_connect+0x7f/0xb0\n __x64_sys_connect+0x14/0x20\n do_syscall_64+0x47/0xc30\n entry_SYSCALL_64_after_hwframe+0x4b/0x53"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/btf.c"], "versions": [{"version": "c53795d48ee8f385c6a9e394651e7ee914baaeba", "lessThan": "f579afacd0a66971fc8481f30d2d377e230a8342", "status": "affected", "versionType": "git"}, {"version": "c53795d48ee8f385c6a9e394651e7ee914baaeba", "lessThan": "4dba79c1e7aad6620bbb707b6c4459380fd90860", "status": "affected", "versionType": "git"}, {"version": "c53795d48ee8f385c6a9e394651e7ee914baaeba", "lessThan": "5da7e15fb5a12e78de974d8908f348e279922ce9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/btf.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "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/f579afacd0a66971fc8481f30d2d377e230a8342"}, {"url": "https://git.kernel.org/stable/c/4dba79c1e7aad6620bbb707b6c4459380fd90860"}, {"url": "https://git.kernel.org/stable/c/5da7e15fb5a12e78de974d8908f348e279922ce9"}], "title": "net: Add rx_skb of kfree_skb to raw_tp_null_args[].", "x_generator": {"engine": "bippy-5f407fcff5a0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8FC6C994-91D3-44C1-95E0-C930D07CFE85", "versionEndExcluding": "6.12.17", "versionStartIncluding": "6.11", "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\nnet: Add rx_skb of kfree_skb to raw_tp_null_args[].\n\nYan Zhai reported a BPF prog could trigger a null-ptr-deref [0]\nin trace_kfree_skb if the prog does not check if rx_sk is NULL.\n\nCommit c53795d48ee8 (\"net: add rx_sk to trace_kfree_skb\") added\nrx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL.\n\nLet's add kfree_skb to raw_tp_null_args[] to let the BPF verifier\nvalidate such a prog and prevent the issue.\n\nNow we fail to load such a prog:\n\n libbpf: prog 'drop': -- BEGIN PROG LOAD LOG --\n 0: R1=ctx() R10=fp0\n ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21\n 0: (79) r3 = *(u64 *)(r1 +24)\n func 'kfree_skb' arg3 has btf_id 5253 type STRUCT 'sock'\n 1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1)\n ; bpf_printk(\"sk: %d, %d\\n\", sk, sk->__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24\n 1: (69) r4 = *(u16 *)(r3 +16)\n R3 invalid mem access 'trusted_ptr_or_null_'\n processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\n -- END PROG LOAD LOG --\n\nNote this fix requires commit 838a10bd2ebf (\"bpf: Augment raw_tp\narguments with PTR_MAYBE_NULL\").\n\n[0]:\nBUG: kernel NULL pointer dereference, address: 0000000000000010\n PF: supervisor read access in kernel mode\n PF: error_code(0x0000) - not-present page\nPGD 0 P4D 0\nPREEMPT SMP\nRIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\nCall Trace:\n <TASK>\n ? __die+0x1f/0x60\n ? page_fault_oops+0x148/0x420\n ? search_bpf_extables+0x5b/0x70\n ? fixup_exception+0x27/0x2c0\n ? exc_page_fault+0x75/0x170\n ? asm_exc_page_fault+0x22/0x30\n ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\n bpf_trace_run4+0x68/0xd0\n ? unix_stream_connect+0x1f4/0x6f0\n sk_skb_reason_drop+0x90/0x120\n unix_stream_connect+0x1f4/0x6f0\n __sys_connect+0x7f/0xb0\n __x64_sys_connect+0x14/0x20\n do_syscall_64+0x47/0xc30\n entry_SYSCALL_64_after_hwframe+0x4b/0x53"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: Add rx_skb of kfree_skb to raw_tp_null_args[]. Yan Zhai reported a BPF prog could trigger a null-ptr-deref [0] in trace_kfree_skb if the prog does not check if rx_sk is NULL. Commit c53795d48ee8 (\"net: add rx_sk to trace_kfree_skb\") added rx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL. Let's add kfree_skb to raw_tp_null_args[] to let the BPF verifier validate such a prog and prevent the issue. Now we fail to load such a prog: libbpf: prog 'drop': -- BEGIN PROG LOAD LOG -- 0: R1=ctx() R10=fp0 ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21 0: (79) r3 = *(u64 *)(r1 +24) func 'kfree_skb' arg3 has btf_id 5253 type STRUCT 'sock' 1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1) ; bpf_printk(\"sk: %d, %d\\n\", sk, sk-&gt;__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24 1: (69) r4 = *(u16 *)(r3 +16) R3 invalid mem access 'trusted_ptr_or_null_' processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0 -- END PROG LOAD LOG -- Note this fix requires commit 838a10bd2ebf (\"bpf: Augment raw_tp arguments with PTR_MAYBE_NULL\"). [0]: BUG: kernel NULL pointer dereference, address: 0000000000000010 PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 0 P4D 0 PREEMPT SMP RIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d Call Trace: ? __die+0x1f/0x60 ? page_fault_oops+0x148/0x420 ? search_bpf_extables+0x5b/0x70 ? fixup_exception+0x27/0x2c0 ? exc_page_fault+0x75/0x170 ? asm_exc_page_fault+0x22/0x30 ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d bpf_trace_run4+0x68/0xd0 ? unix_stream_connect+0x1f4/0x6f0 sk_skb_reason_drop+0x90/0x120 unix_stream_connect+0x1f4/0x6f0 __sys_connect+0x7f/0xb0 __x64_sys_connect+0x14/0x20 do_syscall_64+0x47/0xc30 entry_SYSCALL_64_after_hwframe+0x4b/0x53 "}], "id": "CVE-2025-21852", "lastModified": "2025-03-13T16:30:07.307", "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": "2025-03-12T10:15:17.927", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4dba79c1e7aad6620bbb707b6c4459380fd90860"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5da7e15fb5a12e78de974d8908f348e279922ce9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f579afacd0a66971fc8481f30d2d377e230a8342"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: Add rx_skb of kfree_skb to raw_tp_null_args[].", "id": "2351614", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2351614"}, "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-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: Add rx_skb of kfree_skb to raw_tp_null_args[].\nYan Zhai reported a BPF prog could trigger a null-ptr-deref [0]\nin trace_kfree_skb if the prog does not check if rx_sk is NULL.\nCommit c53795d48ee8 (\"net: add rx_sk to trace_kfree_skb\") added\nrx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL.\nLet's add kfree_skb to raw_tp_null_args[] to let the BPF verifier\nvalidate such a prog and prevent the issue.\nNow we fail to load such a prog:\nlibbpf: prog 'drop': -- BEGIN PROG LOAD LOG --\n0: R1=ctx() R10=fp0\n; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21\n0: (79) r3 = *(u64 *)(r1 +24)\nfunc 'kfree_skb' arg3 has btf_id 5253 type STRUCT 'sock'\n1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1)\n; bpf_printk(\"sk: %d, %d\\n\", sk, sk->__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24\n1: (69) r4 = *(u16 *)(r3 +16)\nR3 invalid mem access 'trusted_ptr_or_null_'\nprocessed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\n-- END PROG LOAD LOG --\nNote this fix requires commit 838a10bd2ebf (\"bpf: Augment raw_tp\narguments with PTR_MAYBE_NULL\").\n[0]:\nBUG: kernel NULL pointer dereference, address: 0000000000000010\nPF: supervisor read access in kernel mode\nPF: error_code(0x0000) - not-present page\nPGD 0 P4D 0\nPREEMPT SMP\nRIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\nCall Trace:\n<TASK>\n? __die+0x1f/0x60\n? page_fault_oops+0x148/0x420\n? search_bpf_extables+0x5b/0x70\n? fixup_exception+0x27/0x2c0\n? exc_page_fault+0x75/0x170\n? asm_exc_page_fault+0x22/0x30\n? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d\nbpf_trace_run4+0x68/0xd0\n? unix_stream_connect+0x1f4/0x6f0\nsk_skb_reason_drop+0x90/0x120\nunix_stream_connect+0x1f4/0x6f0\n__sys_connect+0x7f/0xb0\n__x64_sys_connect+0x14/0x20\ndo_syscall_64+0x47/0xc30\nentry_SYSCALL_64_after_hwframe+0x4b/0x53"], "name": "CVE-2025-21852", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "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-2025-21852\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21852\nhttps://lore.kernel.org/linux-cve-announce/2025031213-CVE-2025-21852-b942@gregkh/T"], "threat_severity": "Moderate"}