{ "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", "versionEndExcluding": "6.18.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.19.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "7.0.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/36539c4d536f851a3b346a6ebb27b51bc3d77a94" }, { "url": "https://git.kernel.org/stable/c/35c2c05261d6f6d84aaa1355afa201d507943e76" }, { "url": "https://git.kernel.org/stable/c/3f5e74b5db9353b01ed50f4de84e75b755f8fbc2" }, { "url": "https://git.kernel.org/stable/c/6f072daefcab1d84ce37c073645615f63be91006" }, { "url": "https://git.kernel.org/stable/c/4cf2768a0291a0cdd0dae801ea0eafa3878a349d" }, { "url": "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" } } } }