{"id":"CVE-2026-64432","summary":"fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns","details":"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-\u003elcns_follow (capacity) can be smaller than lrh-\u003elcns_follow.\n  2. lrh-\u003etarget_vcn may be smaller than dp-\u003evcn, 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-\u003eused in\njournal-replay file record check\").","modified":"2026-07-28T04:03:05.202504269Z","published":"2026-07-25T08:51:07.791Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64432.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3aa96956ca2200674e2a8f9c23ec6ecd45e5010f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/57382ec6ac63b63dce2789e835fded28b698ae79"},{"type":"WEB","url":"https://git.kernel.org/stable/c/946046841013ebac8492ef49651c53638d7a9a6a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/964c3fae1dfc49dde5468eace940f199cda234e9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c6f9e804f73ef809529865fbc7256dd189ff8c33"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf28fc1658463d768657cf1c27a83980d4ba7ef2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f433acc85b86f327d03ba8b03a33c105c51053de"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64432.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64432"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b46acd6a6a627d876898e1c84d3f84902264b445"},{"fixed":"964c3fae1dfc49dde5468eace940f199cda234e9"},{"fixed":"3aa96956ca2200674e2a8f9c23ec6ecd45e5010f"},{"fixed":"946046841013ebac8492ef49651c53638d7a9a6a"},{"fixed":"c6f9e804f73ef809529865fbc7256dd189ff8c33"},{"fixed":"cf28fc1658463d768657cf1c27a83980d4ba7ef2"},{"fixed":"f433acc85b86f327d03ba8b03a33c105c51053de"},{"fixed":"57382ec6ac63b63dce2789e835fded28b698ae79"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64432.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64432.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}