{"id":"CVE-2026-64533","revision":null,"records":[{"revision":"39bee7a2ec804f57921ed9e74bb606b7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64533","aliases":[],"title":"fs/ntfs3: validate lcns_follow in log_replay conversion","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate lcns_follow in log_replay conversion\n\nlog_replay() converts DIR_PAGE_ENTRY_32 records into DIR_PAGE_ENTRY\nrecords when replaying version 0 restart tables.\n\nDuring this conversion, the memmove() length is derived directly from\nthe on-disk lcns_follow field:\n\n\tmemmove(&dp->vcn, &dp0->vcn_low,\n\t\t2 * sizeof(u64) +\n\t\t\t\tle32_to_cpu(dp->lcns_follow) * sizeof(u64));\n\ncheck_rstbl() validates restart table structure, but does not constrain\nper-entry lcns_follow values relative to the entry size. A malformed\nfilesystem image can provide an oversized lcns_follow value, causing\nthe conversion memmove() to access memory beyond the bounds of the\nallocated restart table buffer.\n\nThe same field is later used to bound iteration over page_lcns[],\nso validating lcns_follow during conversion also prevents downstream\nout-of-bounds access from the same malformed metadata.\n\nCompute the maximum valid lcns_follow from the already-validated\nrestart table entry size and reject entries that exceed this bound.\nReuse the existing t16/t32 scratch variables already declared in\nlog_replay() to avoid introducing new declarations.\n\n[almaz.alexandrovich@paragon-software.com: fixed the conflicts]","state":0,"publishedAt":"2026-07-27T06:32:33.74+00:00","modifiedAt":"2026-10-19T20:48:38.72+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/ntfs3/fslog.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"ca343a99806b4fc8e27c48f08be3445c5fcd1445\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"ddfc8683e1a627dbf1b83bacf8961443dd654258\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"57c071e2c4f30b9c6f5aacb6679aab1269fbae99\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"159f694d682e4215b3822ae31ed3a4631628fe55\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"7adb38279812c9c06b0e3fa7382f4d7887f3fa2d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"32b9f8733feb241627fa5f564b1a99b5cae974c5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"6a4c53a2e26a865565bd6a460961e8d6fcb32329\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/ntfs3/fslog.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.15\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.15\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ca343a99806b4fc8e27c48f08be3445c5fcd1445","https://git.kernel.org/stable/c/ddfc8683e1a627dbf1b83bacf8961443dd654258","https://git.kernel.org/stable/c/57c071e2c4f30b9c6f5aacb6679aab1269fbae99","https://git.kernel.org/stable/c/159f694d682e4215b3822ae31ed3a4631628fe55","https://git.kernel.org/stable/c/7adb38279812c9c06b0e3fa7382f4d7887f3fa2d","https://git.kernel.org/stable/c/32b9f8733feb241627fa5f564b1a99b5cae974c5","https://git.kernel.org/stable/c/6a4c53a2e26a865565bd6a460961e8d6fcb32329"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64533","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64533","identifiers":["CVE-2026-64533"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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