{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43365", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.005Z", "datePublished": "2026-05-08T14:21:18.405Z", "dateUpdated": "2026-08-05T12:27:29.220Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:27:29.220Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix undersized l_iclog_roundoff values\n\nIf the superblock doesn't list a log stripe unit, we set the incore log\nroundoff value to 512. This leads to corrupt logs and unmountable\nfilesystems in generic/617 on a disk with 4k physical sectors...\n\nXFS (sda1): Mounting V5 Filesystem ff3121ca-26e6-4b77-b742-aaff9a449e1c\nXFS (sda1): Torn write (CRC failure) detected at log block 0x318e. Truncating head block from 0x3197.\nXFS (sda1): failed to locate log tail\nXFS (sda1): log mount/recovery failed: error -74\nXFS (sda1): log mount failed\nXFS (sda1): Mounting V5 Filesystem ff3121ca-26e6-4b77-b742-aaff9a449e1c\nXFS (sda1): Ending clean mount\n\n...on the current xfsprogs for-next which has a broken mkfs. xfs_info\nshows this...\n\nmeta-data=/dev/sda1 isize=512 agcount=4, agsize=644992 blks\n = sectsz=4096 attr=2, projid32bit=1\n = crc=1 finobt=1, sparse=1, rmapbt=1\n = reflink=1 bigtime=1 inobtcount=1 nrext64=1\n = exchange=1 metadir=1\ndata = bsize=4096 blocks=2579968, imaxpct=25\n = sunit=0 swidth=0 blks\nnaming =version 2 bsize=4096 ascii-ci=0, ftype=1, parent=1\nlog =internal log bsize=4096 blocks=16384, version=2\n = sectsz=4096 sunit=0 blks, lazy-count=1\nrealtime =none extsz=4096 blocks=0, rtextents=0\n = rgcount=0 rgsize=268435456 extents\n = zoned=0 start=0 reserved=0\n\n...observe that the log section has sectsz=4096 sunit=0, which means\nthat the roundoff factor is 512, not 4096 as you'd expect. We should\nfix mkfs not to generate broken filesystems, but anyone can fuzz the\nondisk superblock so we should be more cautious. I think the inadequate\nlogic predates commit a6a65fef5ef8d0, but that's clearly going to\nrequire a different backport." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 8.2, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - Although direct mounting XFS is local/admin-only, the vulnerable XFS log write path is reachable through network-facing services such as nfsd or ksmbd when they export an affected XFS filesystem. A remote client can trigger ordinary create/write/metadata operations that reach XFS transaction logging.\nAC:L - There is no race or fragile memory-layout requirement; once the affected log geometry exists, normal metadata/log traffic reliably uses the undersized roundoff. The attacker only needs to cause filesystem activity that commits XFS transactions.\nPR:N - In the highest reasonable deployment, an anonymous or guest writable network export/upload path backed by XFS lets a remote attacker trigger the path without host privileges. If the export requires credentials this would be PR:L, but the higher-severity reasonable case is unauthenticated write access.\nUI:N - No additional victim action is required after the affected filesystem is mounted/exported. The attacker can trigger log writes by issuing normal remote file operations.\nS:U - The impact remains within the same kernel/filesystem security authority. This is not a VM escape, IOMMU bypass, or cross-scope sandbox escape.\nC:N - The bug corrupts XFS log sizing/alignment and recovery state, but does not expose kernel memory or filesystem contents. I found no read primitive or information disclosure path.\nI:L - The issue can corrupt the XFS journal/on-disk filesystem state, but the corruption is not an attacker-controlled arbitrary write. This supports limited integrity impact rather than full integrity compromise.\nA:H - Corrupt logs can make the filesystem fail log recovery and become unmountable, which is a high availability impact for root, server, or shared storage deployments. The failure can deny access to the affected filesystem and dependent services." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/xfs/xfs_log.c" ], "versions": [ { "version": "a6a65fef5ef8d0a6a0ce514eb66b2f3dfa777b48", "lessThan": "5afae524f83d6a18517298491a5624cb0eae5029", "status": "affected", "versionType": "git" }, { "version": "a6a65fef5ef8d0a6a0ce514eb66b2f3dfa777b48", "lessThan": "2ecda4b83749c1fef0c9dea4fd5e8b513aba3e40", "status": "affected", "versionType": "git" }, { "version": "a6a65fef5ef8d0a6a0ce514eb66b2f3dfa777b48", "lessThan": "41e91dff2d3974730b5ee50daa8e27ec254cbf91", "status": "affected", "versionType": "git" }, { "version": "a6a65fef5ef8d0a6a0ce514eb66b2f3dfa777b48", "lessThan": "e88ce9f0536f3b2149afb70625cfc4bd74a4ac6d", "status": "affected", "versionType": "git" }, { "version": "a6a65fef5ef8d0a6a0ce514eb66b2f3dfa777b48", "lessThan": "446a1f5bb64ba38adb93cb043ff0f7b85e8937ca", "status": "affected", "versionType": "git" }, { "version": "a6a65fef5ef8d0a6a0ce514eb66b2f3dfa777b48", "lessThan": "5e7148402dfc4a5b7894d8e97b15e5c2e70924aa", "status": "affected", "versionType": "git" }, { "version": "a6a65fef5ef8d0a6a0ce514eb66b2f3dfa777b48", "lessThan": "52a8a1ba883defbfe3200baa22cf4cd21985d51a", "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_log.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.9", "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": "5.14", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.19.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5afae524f83d6a18517298491a5624cb0eae5029" }, { "url": "https://git.kernel.org/stable/c/2ecda4b83749c1fef0c9dea4fd5e8b513aba3e40" }, { "url": "https://git.kernel.org/stable/c/41e91dff2d3974730b5ee50daa8e27ec254cbf91" }, { "url": "https://git.kernel.org/stable/c/e88ce9f0536f3b2149afb70625cfc4bd74a4ac6d" }, { "url": "https://git.kernel.org/stable/c/446a1f5bb64ba38adb93cb043ff0f7b85e8937ca" }, { "url": "https://git.kernel.org/stable/c/5e7148402dfc4a5b7894d8e97b15e5c2e70924aa" }, { "url": "https://git.kernel.org/stable/c/52a8a1ba883defbfe3200baa22cf4cd21985d51a" } ], "title": "xfs: fix undersized l_iclog_roundoff values", "x_generator": { "engine": "bippy-1.2.0" } } } }