{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64432", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.787Z", "datePublished": "2026-07-25T08:51:07.791Z", "dateUpdated": "2026-08-17T04:55:33.145Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:55:33.145Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns\n\nIn the analysis pass of $LogFile journal replay, log_replay() copies\nLCNs from each action log record into an existing Dirty Page Table\n(DPT) entry without bounding the destination index. A crafted NTFS\nimage with DPT entry lcns_follow=1 and an action log record with\nlcns_follow=2 produces a kernel slab out-of-bounds write at mount\ntime:\n\n BUG: KASAN: slab-out-of-bounds in log_replay+0x654c/0xdb60\n Write of size 8 at addr ffff8880095e1040 by task mount\n\nTwo attacker-controlled fields can drive j+i past the allocated\npage_lcns[] array:\n\n 1. dp->lcns_follow (capacity) can be smaller than lrh->lcns_follow.\n 2. lrh->target_vcn may be smaller than dp->vcn, making the u64\n subtraction wrap to a huge size_t.\n\nValidate target VCN delta and per-record LCN count against the\nDPT entry capacity, bail via the existing out: cleanup label with\n-EINVAL.\n\nThis mirrors the bounds-check pattern added in commit b2bc7c44ed17\n(\"fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot\")\nand commit 0ca0485e4b2e (\"fs/ntfs3: validate rec->used in\njournal-replay file record check\")." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable journal-replay code is reached by mounting a crafted local block-device or loop-backed NTFS image, not through network traffic.\nAC:L - Crafted DPT and action records deterministically trigger the out-of-bounds write without a race or conditions beyond attacker control.\nPR:N - Although direct mounting requires initial-namespace CAP_SYS_ADMIN, an unprivileged attacker can provide the crafted volume for a privileged victim to mount and therefore needs no privileges.\nUI:R - A victim must attach, select, or mount the attacker-supplied NTFS volume; replay occurs during that mount even when read-only.\nS:U - The corruption and resulting impacts occur within the host kernel's existing security authority, without crossing a virtualization or other scope boundary.\nC:H - The attacker controls a sequential kernel slab out-of-bounds write that can corrupt adjacent objects and plausibly enable kernel code execution and arbitrary memory disclosure.\nI:H - The attacker-controlled 64-bit overwrite can corrupt kernel objects, pointers, or control data, making arbitrary modification and control-flow hijacking defensible.\nA:H - The reproduced slab out-of-bounds write can cause an immediate kernel oops or panic, and malformed volumes can trigger it repeatedly when mounted." } ] } ], "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": "964c3fae1dfc49dde5468eace940f199cda234e9", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "3aa96956ca2200674e2a8f9c23ec6ecd45e5010f", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "946046841013ebac8492ef49651c53638d7a9a6a", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "c6f9e804f73ef809529865fbc7256dd189ff8c33", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "cf28fc1658463d768657cf1c27a83980d4ba7ef2", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "f433acc85b86f327d03ba8b03a33c105c51053de", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "57382ec6ac63b63dce2789e835fded28b698ae79", "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": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/964c3fae1dfc49dde5468eace940f199cda234e9" }, { "url": "https://git.kernel.org/stable/c/3aa96956ca2200674e2a8f9c23ec6ecd45e5010f" }, { "url": "https://git.kernel.org/stable/c/946046841013ebac8492ef49651c53638d7a9a6a" }, { "url": "https://git.kernel.org/stable/c/c6f9e804f73ef809529865fbc7256dd189ff8c33" }, { "url": "https://git.kernel.org/stable/c/cf28fc1658463d768657cf1c27a83980d4ba7ef2" }, { "url": "https://git.kernel.org/stable/c/f433acc85b86f327d03ba8b03a33c105c51053de" }, { "url": "https://git.kernel.org/stable/c/57382ec6ac63b63dce2789e835fded28b698ae79" } ], "title": "fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns", "x_generator": { "engine": "bippy-1.2.0" } } } }