{"id":"CVE-2026-64432","title":"fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns","summary":"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 rec…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 964c3fae1dfc49dde5468eace940f199cda234e9","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 3aa96956ca2200674e2a8f9c23ec6ecd45e5010f","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 946046841013ebac8492ef49651c53638d7a9a6a","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < c6f9e804f73ef809529865fbc7256dd189ff8c33","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < cf28fc1658463d768657cf1c27a83980d4ba7ef2","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < f433acc85b86f327d03ba8b03a33c105c51053de","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 57382ec6ac63b63dce2789e835fded28b698ae79","Linux 5.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:40:33.822171Z"},"published":"2026-07-25","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:35.241Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64432","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"}],"tags":["cve.org"],"epss":0.00135,"epssPercentile":0.02637,"ingestedAt":"2026-10-16T17:24:46.819Z","slug":"CVE-2026-64432","body":"## Overview\n\nIn 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\").\n\n## Affected\n\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 964c3fae1dfc49dde5468eace940f199cda234e9`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 3aa96956ca2200674e2a8f9c23ec6ecd45e5010f`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 946046841013ebac8492ef49651c53638d7a9a6a`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < c6f9e804f73ef809529865fbc7256dd189ff8c33`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < cf28fc1658463d768657cf1c27a83980d4ba7ef2`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < f433acc85b86f327d03ba8b03a33c105c51053de`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 57382ec6ac63b63dce2789e835fded28b698ae79`\n- `Linux 5.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}