CVE-2026-31453

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Background inode\nreclaim or the dquot shrinker can free the log item while the AIL lock\nis not held, and the tracepoints in the switch statement dereference\nthe log item after iop_push() returns.\n\nFix this by capturing the log item type, flags, and LSN before calling\nxfsaild_push_item(), and introducing a new xfs_ail_push_class trace\nevent class that takes these pre-captured values and the ailp pointer\ninstead of the log item pointer."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable XFS AIL push path is reached through local filesystem activity on a mounted XFS filesystem, via syscalls such as ioctl/setattr, create/unlink, writes, and reclaim-triggering workload. It is not reachable directly over a network, adjacent, or physical interface.\nAC:L - A local attacker can generate dirty/reclaimable inode or dquot log items and induce reclaim or pressure while xfsaild pushes the AIL. The race is between attacker-influenced filesystem workload and kernel background paths, so under the higher-severity rule this is low complexity.\nPR:L - An unprivileged local user with ordinary access to files on an existing XFS mount can feed the AIL with log items and trigger reclaim behavior. Mounting XFS itself needs elevated privileges, but exploiting an already-mounted writable XFS filesystem does not require init-namespace root.\nUI:N - No victim interaction is required once the attacker has local access to the XFS filesystem. The vulnerable xfsaild work runs asynchronously in the kernel.\nS:U - The vulnerability affects the kernel and filesystem state within the same local security authority. It does not cross a virtualization, IOMMU, or separate security-scope boundary.\nC:H - This is a kernel use-after-free of XFS log-item memory after push callbacks can free the object. Under the required scoring guidance, use-after-free conditions are treated as high confidentiality impact because reclaimed object contents can enable kernel memory disclosure.\nI:H - The freed log-item memory can be reclaimed and attacker-influenced before kernel dereference, giving a plausible path to stronger heap exploitation primitives. Under the required scoring guidance, kernel use-after-free conditions are scored as high integrity impact.\nA:H - The bug is a KASAN-confirmed slab use-after-free in xfsaild and can crash or panic the kernel. Kernel crashes are high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/xfs/xfs_trace.h", "fs/xfs/xfs_trans_ail.c"], "versions": [{"version": "90c60e16401248a4900f3f9387f563d0178dcf34", "lessThan": "c8a2ab339b88d10fc34a3318c92f07d8a467019d", "status": "affected", "versionType": "git"}, {"version": "90c60e16401248a4900f3f9387f563d0178dcf34", "lessThan": "7121b22b0bac89394cc4c6a54b5aebc15347bdf5", "status": "affected", "versionType": "git"}, {"version": "90c60e16401248a4900f3f9387f563d0178dcf34", "lessThan": "c4d603e8e58a3bf35480135ccca2b4f7238abda5", "status": "affected", "versionType": "git"}, {"version": "90c60e16401248a4900f3f9387f563d0178dcf34", "lessThan": "95fb5d643cc70959baa54cd17f52f80ffc3295e7", "status": "affected", "versionType": "git"}, {"version": "90c60e16401248a4900f3f9387f563d0178dcf34", "lessThan": "451c6329d9afa45862c36fe6677eb7750db60617", "status": "affected", "versionType": "git"}, {"version": "90c60e16401248a4900f3f9387f563d0178dcf34", "lessThan": "79ef34ec0554ec04bdbafafbc9836423734e1bd6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/xfs/xfs_trace.h", "fs/xfs/xfs_trans_ail.c"], "versions": [{"version": "5.9", "status": "affected"}, {"version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.6.131"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.12.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c8a2ab339b88d10fc34a3318c92f07d8a467019d"}, {"url": "https://git.kernel.org/stable/c/7121b22b0bac89394cc4c6a54b5aebc15347bdf5"}, {"url": "https://git.kernel.org/stable/c/c4d603e8e58a3bf35480135ccca2b4f7238abda5"}, {"url": "https://git.kernel.org/stable/c/95fb5d643cc70959baa54cd17f52f80ffc3295e7"}, {"url": "https://git.kernel.org/stable/c/451c6329d9afa45862c36fe6677eb7750db60617"}, {"url": "https://git.kernel.org/stable/c/79ef34ec0554ec04bdbafafbc9836423734e1bd6"}], "title": "xfs: avoid dereferencing log items after push callbacks", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31453", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:09:37.370268Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T18:35:49.200Z"}}]}}

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It is not reachable directly over a network, adjacent, or physical interface.\nAC:L - A local attacker can generate dirty/reclaimable inode or dquot log items and induce reclaim or pressure while xfsaild pushes the AIL. The race is between attacker-influenced filesystem workload and kernel background paths, so under the higher-severity rule this is low complexity.\nPR:L - An unprivileged local user with ordinary access to files on an existing XFS mount can feed the AIL with log items and trigger reclaim behavior. Mounting XFS itself needs elevated privileges, but exploiting an already-mounted writable XFS filesystem does not require init-namespace root.\nUI:N - No victim interaction is required once the attacker has local access to the XFS filesystem. The vulnerable xfsaild work runs asynchronously in the kernel.\nS:U - The vulnerability affects the kernel and filesystem state within the same local security authority. It does not cross a virtualization, IOMMU, or separate security-scope boundary.\nC:H - This is a kernel use-after-free of XFS log-item memory after push callbacks can free the object. Under the required scoring guidance, use-after-free conditions are treated as high confidentiality impact because reclaimed object contents can enable kernel memory disclosure.\nI:H - The freed log-item memory can be reclaimed and attacker-influenced before kernel dereference, giving a plausible path to stronger heap exploitation primitives. Under the required scoring guidance, kernel use-after-free conditions are scored as high integrity impact.\nA:H - The bug is a KASAN-confirmed slab use-after-free in xfsaild and can crash or panic the kernel. 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Background inode\nreclaim or the dquot shrinker can free the log item while the AIL lock\nis not held, and the tracepoints in the switch statement dereference\nthe log item after iop_push() returns.\n\nFix this by capturing the log item type, flags, and LSN before calling\nxfsaild_push_item(), and introducing a new xfs_ail_push_class trace\nevent class that takes these pre-captured values and the ailp pointer\ninstead of the log item pointer."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.168", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.131", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.80", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.21", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.11", "versionStartIncluding": "5.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:42.104Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31453", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:35:49.200Z", "dateReserved": "2026-03-09T15:48:24.091Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-22T13:53:47.577Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Background inode\nreclaim or the dquot shrinker can free the log item while the AIL lock\nis not held, and the tracepoints in the switch statement dereference\nthe log item after iop_push() returns.\n\nFix this by capturing the log item type, flags, and LSN before calling\nxfsaild_push_item(), and introducing a new xfs_ail_push_class trace\nevent class that takes these pre-captured values and the ailp pointer\ninstead of the log item pointer."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxfs: evitar la desreferenciaci\u00f3n de elementos de registro despu\u00e9s de las devoluciones de llamada de \u2019push\u2019\n\nDespu\u00e9s de que xfsaild_push_item() llama a iop_push(), el elemento de registro puede haber sido liberado si el bloqueo AIL se liber\u00f3 durante el \u2019push\u2019. La recuperaci\u00f3n de inodos en segundo plano o el reductor de dquot pueden liberar el elemento de registro mientras el bloqueo AIL no est\u00e1 retenido, y los puntos de rastreo en la instrucci\u00f3n \u2019switch\u2019 desreferencian el elemento de registro despu\u00e9s de que iop_push() regresa.\n\nEsto se soluciona capturando el tipo de elemento de registro, las banderas y el LSN antes de llamar a xfsaild_push_item(), e introduciendo una nueva clase de evento de rastreo xfs_ail_push_class que toma estos valores pre-capturados y el puntero ailp en lugar del puntero del elemento de registro."}], "id": "CVE-2026-31453", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31453", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:09:37.370268Z", "version": "2.0.3"}}]}, "published": "2026-04-22T14:16:39.653", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/451c6329d9afa45862c36fe6677eb7750db60617"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7121b22b0bac89394cc4c6a54b5aebc15347bdf5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/79ef34ec0554ec04bdbafafbc9836423734e1bd6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95fb5d643cc70959baa54cd17f52f80ffc3295e7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c4d603e8e58a3bf35480135ccca2b4f7238abda5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c8a2ab339b88d10fc34a3318c92f07d8a467019d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: xfs: avoid dereferencing log items after push callbacks", "id": "2460731", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460731"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's XFS filesystem. This vulnerability arises when log items are accessed after their memory has been freed, specifically during certain push callbacks if the Allocation Information List (AIL) lock is released. This memory corruption can lead to a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-31453", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31453\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31453\nhttps://lore.kernel.org/linux-cve-announce/2026042248-CVE-2026-31453-6c3f@gregkh/T"], "threat_severity": "Moderate"}

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