CVE-2024-40951

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Since ocfs2 hasn't set\nbh->b_assoc_map, it will trigger NULL pointer dereference when calling\ninto ocfs2_abort_trigger().\n\nActually this was pointed out in history, see commit 74e364ad1b13. But\nI've made a mistake when reviewing commit 8887b94d9322 and then\nre-introduce this regression.\n\nSince we cannot revive bdev in buffer head, so fix this issue by\ninitializing all types of ocfs2 triggers when fill super, and then get the\nspecific ocfs2 trigger from ocfs2_caching_info when access journal.\n\n[joseph.qi@linux.alibaba.com: v2]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ocfs2: corrige la desreferencia del puntero NULL en ocfs2_abort_trigger() bdev->bd_super se ha eliminado y el commit 8887b94d9322 cambia el uso de bdev->bd_super a b_assoc_map->host->i_sb. Dado que ocfs2 no ha configurado bh->b_assoc_map, activar\u00e1 la desreferencia del puntero NULL al llamar a ocfs2_abort_trigger(). En realidad, esto se se\u00f1al\u00f3 en la historia, consulte el commit 74e364ad1b13. Pero comet\u00ed un error al revisar el commit 8887b94d9322 y luego reintroducir esta regresi\u00f3n. Dado que no podemos reactivar bdev en el encabezado del b\u00fafer, solucione este problema inicializando todos los tipos de activadores de ocfs2 cuando complete el super, y luego obtenga el activador de ocfs2 espec\u00edfico de ocfs2_caching_info cuando acceda al diario. [joseph.qi@linux.alibaba.com:v2] Enlace: https://lkml.kernel.org/r/20240602112045.1112708-1-joseph.qi@linux.alibaba.com"}], "id": "CVE-2024-40951", "lastModified": "2026-06-17T07:46:56.377", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-40951", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:03:58.522422Z", "version": "2.0.3"}}]}, "published": "2024-07-12T13:15:17.420", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67bcecd780609f471260a8c83fb0ae15f27734ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/685d03c3795378fca6a1b3d43581f7f1a3fc095f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb63357ef229fae061ce7ce2839d558681c42f1a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67bcecd780609f471260a8c83fb0ae15f27734ce"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/685d03c3795378fca6a1b3d43581f7f1a3fc095f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb63357ef229fae061ce7ce2839d558681c42f1a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger()", "id": "2297535", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2297535"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/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:\nocfs2: fix NULL pointer dereference in ocfs2_abort_trigger()\nbdev->bd_super has been removed and commit 8887b94d9322 change the usage\nfrom bdev->bd_super to b_assoc_map->host->i_sb. Since ocfs2 hasn't set\nbh->b_assoc_map, it will trigger NULL pointer dereference when calling\ninto ocfs2_abort_trigger().\nActually this was pointed out in history, see commit 74e364ad1b13. But\nI've made a mistake when reviewing commit 8887b94d9322 and then\nre-introduce this regression.\nSince we cannot revive bdev in buffer head, so fix this issue by\ninitializing all types of ocfs2 triggers when fill super, and then get the\nspecific ocfs2 trigger from ocfs2_caching_info when access journal.\n[joseph.qi@linux.alibaba.com: v2]", "A flaw was found in the Linux kernel. The resolved OCFS2 vulnerability involved a NULL pointer dereference in `ocfs2_abort_trigger()`. The issue arose after `dev ->bd_super` was removed and replaced by `b_assoc_map->host->i_sb`, leading to errors since OCFS2 did not set `bh->b_assoc_map.`"], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-40951", "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": "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": "2024-07-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-40951\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-40951\nhttps://lore.kernel.org/linux-cve-announce/2024071222-CVE-2024-40951-677c@gregkh/T"], "statement": "Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.", "threat_severity": "Moderate"}

{}