{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89617", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.735Z", "datePublished": "2026-09-11T19:45:16.737Z", "dateUpdated": "2026-10-19T08:49:49.792Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:49.792Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate dirty page table on log replay\n\nEach DIR_PAGE_ENTRY ends in a page_lcns[] array whose length is the on-disk\nlcns_follow field. check_rstbl() validates the table bookkeeping but never\nchecks that this array fits in the entry, so a crafted lcns_follow lets the\nv0->v1 conversion memmove and later replay passes run off the entry.\n\nAdd check_dp_table() to reject, right after check_rstbl(), any entry larger\nthan its size claims via struct_size() (the same expression used to allocate\nthese entries, so the check is overflow-safe by construction). All consumers\ncan then trust lcns_follow as the real capacity. This covers every\npage_lcns[] access whose index is bounded by the entry itself (the\nconversion memmove, the HotFix store via find_dp(), and the self-bounded\nscan loops). Accesses whose index comes from the log record need a separate\nbound and are handled in a follow-up patch." } ], "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 - log_replay() is reached only from ntfs_fill_super via ntfs_loadlog_and_replay while mounting a local NTFS block device; the dirty-page table is parsed from on-disk $LogFile, not from ksmbd, nfsd, or any received-packet path.\nAC:L - The attacker fully controls DIR_PAGE_ENTRY.lcns_follow and the restart table in a crafted $LogFile, so a value larger than the entry size reliably drives the v0 conversion memmove, HotFix store, and lcns_follow-bounded scan loops off the entry with no race or uncontrollable layout.\nPR:L - Triggering log replay requires mounting the malicious NTFS image (CAP_SYS_ADMIN). Unprivileged users can cause that mount via user+mount namespaces, loop-backed images, or common desktop/Android helpers (udisks/gvfs/USB automount) without init-namespace root.\nUI:N - No separate victim action is required: the attacker mounts their own crafted NTFS image (or causes automount of media they supply) and log replay runs automatically in ntfs_fill_super before any further file access.\nS:U - Corruption is confined to kernel heap during NTFS journal replay in the same kernel security authority; it is a local privilege-escalation/memory-safety issue, not a VM, IOMMU, or sandbox escape.\nC:H - Crafted lcns_follow makes DeleteDirtyClusters, HotFix, and dirty-page scan loops read page_lcns[] far past the kmemdup'd DIR_PAGE_ENTRY, disclosing adjacent kernel heap; that OOB read plus heap corruption yields arbitrary disclosure primitives.\nI:H - HotFix writes attacker-controlled LCNs and DeleteDirtyClusters zeros page_lcns[j] for j < the forged lcns_follow, overflowing the restart-table heap object into neighboring kmalloc data and enabling arbitrary kernel writes or control-flow hijack.\nA:H - Out-of-bounds heap access during mount-time log replay corrupts slab metadata or adjacent objects, causing kernel oops/panic, and a huge lcns_follow can also hang the mount path in a multi-billion-iteration scan." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/fslog.c" ], "versions": [ { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "0e07ea2fc45a7b4757ef7bf1f692cc0180a08323", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "1e90b1703ee1a04cd3e9e399353fc536f5f3ba10", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "d23155634a4bc1183e761d5eb2c043b2e693cc98", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "1200c2779c43b62656ccbb67df9468a7a9af2484", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "0908da07c23be4f94b99dfd9a94765525f0fe4bd", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "006cb7713dec10368e699abc4367e5faa334c9a5", "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/ntfs3/fslog.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "5.15", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0e07ea2fc45a7b4757ef7bf1f692cc0180a08323" }, { "url": "https://git.kernel.org/stable/c/1e90b1703ee1a04cd3e9e399353fc536f5f3ba10" }, { "url": "https://git.kernel.org/stable/c/d23155634a4bc1183e761d5eb2c043b2e693cc98" }, { "url": "https://git.kernel.org/stable/c/1200c2779c43b62656ccbb67df9468a7a9af2484" }, { "url": "https://git.kernel.org/stable/c/2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56" }, { "url": "https://git.kernel.org/stable/c/0908da07c23be4f94b99dfd9a94765525f0fe4bd" }, { "url": "https://git.kernel.org/stable/c/006cb7713dec10368e699abc4367e5faa334c9a5" } ], "title": "fs/ntfs3: validate dirty page table on log replay", "x_generator": { "engine": "bippy-1.2.0" } } } }