CVE-2026-31597

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31597", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.121Z", "datePublished": "2026-04-24T14:42:22.655Z", "dateUpdated": "2026-08-05T12:23:41.347Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:23:41.347Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY\n\nfilemap_fault() may drop the mmap_lock before returning VM_FAULT_RETRY,\nas documented in mm/filemap.c:\n\n \"If our return value has VM_FAULT_RETRY set, it's because the mmap_lock\n may be dropped before doing I/O or by lock_folio_maybe_drop_mmap().\"\n\nWhen this happens, a concurrent munmap() can call remove_vma() and free\nthe vm_area_struct via RCU. The saved 'vma' pointer in ocfs2_fault() then\nbecomes a dangling pointer, and the subsequent trace_ocfs2_fault() call\ndereferences it -- a use-after-free.\n\nFix this by saving ip_blkno as a plain integer before calling\nfilemap_fault(), and removing vma from the trace event. Since\nip_blkno is copied by value before the lock can be dropped, it\nremains valid regardless of what happens to the vma or inode\nafterward."}], "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 path is reached by local user memory-management operations on an OCFS2 regular file mapping, via mmap/page fault and concurrent unmap. It is not directly reachable from network packets or adjacent/physical interfaces.\nAC:L - The attacker can control the relevant mmap, page fault, and munmap activity from their own process or cooperating threads. The VM_FAULT_RETRY window is a normal retry path where filemap_fault() may drop mmap_lock, so the race is attacker-repeatable.\nPR:L - A basic local user with permission to open and mmap a file on an already-mounted OCFS2 filesystem can reach ocfs2_fault(); no kernel capability is needed for the fault/unmap path. Mounting OCFS2 itself is privileged, but a reasonable OCFS2 deployment already has the filesystem mounted.\nUI:N - Exploitation does not require a separate victim action after the attacker has local access. The attacker triggers the mmap, page fault, and munmap operations directly.\nS:U - The vulnerability is in kernel filesystem/MM handling and impacts the same kernel security authority. This is standard local kernel compromise/DoS territory, not a cross-scope VM or sandbox boundary by itself.\nC:H - This is a kernel heap use-after-free of a vm_area_struct after mmap_lock can be dropped and the VMA freed. Under the stated kernel guidance, use-after-free bugs are scored High for confidentiality because freed object reuse can enable kernel memory disclosure.\nI:H - Although the observed KASAN report is a UAF read, it is still a dangling kernel heap object use in attacker-influenced VMA lifetime/reuse conditions. Under the stated guidance and uncertainty rule, UAF memory corruption is scored High for integrity.\nA:H - The bug has a demonstrated KASAN slab-use-after-free in ocfs2_fault() and can crash/oops the kernel. Kernel crash availability impact is High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/mmap.c", "fs/ocfs2/ocfs2_trace.h"], "versions": [{"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "36539c4d536f851a3b346a6ebb27b51bc3d77a94", "status": "affected", "versionType": "git"}, {"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "35c2c05261d6f6d84aaa1355afa201d507943e76", "status": "affected", "versionType": "git"}, {"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "3f5e74b5db9353b01ed50f4de84e75b755f8fbc2", "status": "affected", "versionType": "git"}, {"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "6f072daefcab1d84ce37c073645615f63be91006", "status": "affected", "versionType": "git"}, {"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "4cf2768a0291a0cdd0dae801ea0eafa3878a349d", "status": "affected", "versionType": "git"}, {"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "d45ff441b416d4aa1af72b1db23d959601c04da2", "status": "affected", "versionType": "git"}, {"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "76a602fdbb78dd05b2da06f74a988cebc97e82d0", "status": "affected", "versionType": "git"}, {"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "925bf22c1b823e231b1baea761fe8a1512e442f2", "status": "affected", "versionType": "git"}, {"version": "614a9e849ca6ea24843795251cb30af525d5336b", "lessThan": "7de554cabf160e331e4442e2a9ad874ca9875921", "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/ocfs2/mmap.c", "fs/ocfs2/ocfs2_trace.h"], "versions": [{"version": "2.6.39", "status": "affected"}, {"version": "0", "lessThan": "2.6.39", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.1", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "2.6.39", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.6.136"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.12.83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", 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"https://git.kernel.org/stable/c/d45ff441b416d4aa1af72b1db23d959601c04da2"}, {"url": "https://git.kernel.org/stable/c/76a602fdbb78dd05b2da06f74a988cebc97e82d0"}, {"url": "https://git.kernel.org/stable/c/925bf22c1b823e231b1baea761fe8a1512e442f2"}, {"url": "https://git.kernel.org/stable/c/7de554cabf160e331e4442e2a9ad874ca9875921"}], "title": "ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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The saved 'vma' pointer in ocfs2_fault() then\nbecomes a dangling pointer, and the subsequent trace_ocfs2_fault() call\ndereferences it -- a use-after-free.\n\nFix this by saving ip_blkno as a plain integer before calling\nfilemap_fault(), and removing vma from the trace event. Since\nip_blkno is copied by value before the lock can be dropped, it\nremains valid regardless of what happens to the vma or inode\nafterward."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nocfs2: correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en ocfs2_fault() cuando VM_FAULT_RETRY\n\nfilemap_fault() puede liberar el mmap_lock antes de devolver VM_FAULT_RETRY, como se documenta en mm/filemap.c:\n\n\u2019Si nuestro valor de retorno tiene VM_FAULT_RETRY establecido, es porque el mmap_lock puede ser liberado antes de realizar E/S o por lock_folio_maybe_drop_mmap().\u2019\n\nCuando esto sucede, un munmap() concurrente puede llamar a remove_vma() y liberar el vm_area_struct a trav\u00e9s de RCU. El puntero \u2019vma\u2019 guardado en ocfs2_fault() entonces se convierte en un puntero colgante, y la subsiguiente llamada a trace_ocfs2_fault() lo desreferencia - - un uso despu\u00e9s de liberaci\u00f3n.\n\nSolucione esto al guardar ip_blkno como un entero simple antes de llamar a filemap_fault(), y eliminando vma del evento de traza. Dado que ip_blkno se copia por valor antes de que el bloqueo pueda ser liberado, permanece v\u00e1lido independientemente de lo que suceda con el vma o el inodo despu\u00e9s."}], "id": "CVE-2026-31597", "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"}]}, "published": "2026-04-24T15:16:37.457", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35c2c05261d6f6d84aaa1355afa201d507943e76"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/36539c4d536f851a3b346a6ebb27b51bc3d77a94"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3f5e74b5db9353b01ed50f4de84e75b755f8fbc2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cf2768a0291a0cdd0dae801ea0eafa3878a349d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f072daefcab1d84ce37c073645615f63be91006"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/76a602fdbb78dd05b2da06f74a988cebc97e82d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7de554cabf160e331e4442e2a9ad874ca9875921"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/925bf22c1b823e231b1baea761fe8a1512e442f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d45ff441b416d4aa1af72b1db23d959601c04da2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY", "id": "2461484", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461484"}, "csaw": false, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel's OCFS2 (Oracle Cluster File System version 2) component. A local attacker could exploit a use-after-free vulnerability when `filemap_fault()` drops the `mmap_lock` before returning `VM_FAULT_RETRY`. This allows a concurrent `munmap()` operation to free a `vm_area_struct`, leading to `ocfs2_fault()` dereferencing a dangling pointer. This issue can result in system instability or crashes."], "name": "CVE-2026-31597", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31597\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31597\nhttps://lore.kernel.org/linux-cve-announce/2026042417-CVE-2026-31597-79cd@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[614a9e849ca6ea24843795251cb30af525d5336b,6f072daefcab1d84ce37c073645615f63be91006)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[614a9e849ca6ea24843795251cb30af525d5336b,4cf2768a0291a0cdd0dae801ea0eafa3878a349d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[614a9e849ca6ea24843795251cb30af525d5336b,d45ff441b416d4aa1af72b1db23d959601c04da2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[614a9e849ca6ea24843795251cb30af525d5336b,76a602fdbb78dd05b2da06f74a988cebc97e82d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[614a9e849ca6ea24843795251cb30af525d5336b,925bf22c1b823e231b1baea761fe8a1512e442f2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[614a9e849ca6ea24843795251cb30af525d5336b,7de554cabf160e331e4442e2a9ad874ca9875921)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.39"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.39)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.136,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.83,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.24,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.14,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.1,7.0.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-04-27T19:00:15.637622+00:00", "updated": "2026-04-29T21:45:20.744300+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}