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As the above comment in the code says, this is very\nunlikely to happen, but it's wrong anyway so let's fix it.\n\nI hit this issue because of a different bug that caused tx_queue to be\nNULL. If that happens, this is the error message that we get here:\n BUG: unable to handle kernel NULL pointer dereference at 0000000000000020\n [...]\n RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sfc: corrige la desreferencia del puntero nulo en efx_hard_start_xmit Intentar obtener el canal de la variable tx_queue aqu\u00ed es incorrecto porque solo podemos estar aqu\u00ed si tx_queue es NULL, por lo que no debemos desreferenciarlo. Como dice el comentario anterior en el c\u00f3digo, es muy poco probable que esto suceda, pero de todos modos est\u00e1 mal, as\u00ed que solucion\u00e9moslo. Encontr\u00e9 este problema debido a un error diferente que provoc\u00f3 que tx_queue fuera NULL. Si eso sucede, este es el mensaje de error que recibimos aqu\u00ed: ERROR: no se puede manejar la desreferencia del puntero NULL del kernel en 0000000000000020 [...] RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]"}], "id": "CVE-2022-48648", "lastModified": "2025-01-14T14:52:07.293", "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": "2024-04-28T13:15:07.290", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a242eb2913a4aa3d6fbdb86559f27628e9466f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8547c7bfc0617e7184e4da65b9b96681fcfe9998"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b3b41d4d95d3822b2e459ecbc80d030ea6aec5e7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b3b952168ee1f220ba729fa100fd9d5aa752eb03"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a242eb2913a4aa3d6fbdb86559f27628e9466f3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8547c7bfc0617e7184e4da65b9b96681fcfe9998"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b3b41d4d95d3822b2e459ecbc80d030ea6aec5e7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b3b952168ee1f220ba729fa100fd9d5aa752eb03"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: sfc: fix null pointer dereference in efx_hard_start_xmit", "id": "2277814", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2277814"}, "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:\nsfc: fix null pointer dereference in efx_hard_start_xmit\nTrying to get the channel from the tx_queue variable here is wrong\nbecause we can only be here if tx_queue is NULL, so we shouldn't\ndereference it. As the above comment in the code says, this is very\nunlikely to happen, but it's wrong anyway so let's fix it.\nI hit this issue because of a different bug that caused tx_queue to be\nNULL. If that happens, this is the error message that we get here:\nBUG: unable to handle kernel NULL pointer dereference at 0000000000000020\n[...]\nRIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]", "A potential NULL pointer dereference was found in efx_hard_start_xmit in the Linux kernel. This issue may lead to a crash."], "name": "CVE-2022-48648", "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": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48648\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48648\nhttps://lore.kernel.org/linux-cve-announce/2024042857-CVE-2022-48648-eaf8@gregkh/T"], "threat_severity": "Moderate"}