{"id":"CVE-2026-31716","summary":"fs/ntfs3: validate rec-\u003eused in journal-replay file record check","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate rec-\u003eused in journal-replay file record check\n\ncheck_file_record() validates rec-\u003etotal against the record size but\nnever validates rec-\u003eused.  The do_action() journal-replay handlers read\nrec-\u003eused from disk and use it to compute memmove lengths:\n\n  DeleteAttribute:    memmove(attr, ..., used - asize - roff)\n  CreateAttribute:    memmove(..., attr, used - roff)\n  change_attr_size:   memmove(..., used - PtrOffset(rec, next))\n\nWhen rec-\u003eused is smaller than the offset of a validated attribute, or\nlarger than the record size, these subtractions can underflow allowing\nus to copy huge amounts of memory in to a 4kb buffer, generally\nconsidered a bad idea overall.\n\nThis requires a corrupted filesystem, which isn't a threat model the\nkernel really needs to worry about, but checking for such an obvious\nout-of-bounds value is good to keep things robust, especially on journal\nreplay\n\nFix this up by bounding rec-\u003eused correctly.\n\nThis is much like commit b2bc7c44ed17 (\"fs/ntfs3: Fix slab-out-of-bounds\nread in DeleteIndexEntryRoot\") which checked different values in this\nsame switch statement.","modified":"2026-05-18T05:59:54.201548308Z","published":"2026-05-01T13:56:11.263Z","related":["CGA-x5g9-8q3v-w998","openSUSE-SU-2026:10793-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31716.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0112e6279420d4005b3d57af36fb45c01b8d0116"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4b1613d7e2deda831a97e427d1ea586e50fe1be5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f79d0403ea20a81bc29105bba54fbcab54e8c403"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f90b8a1798b750755a9e9aee66678f0a1820bbaf"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31716.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31716"},{"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":"f90b8a1798b750755a9e9aee66678f0a1820bbaf"},{"fixed":"4b1613d7e2deda831a97e427d1ea586e50fe1be5"},{"fixed":"0112e6279420d4005b3d57af36fb45c01b8d0116"},{"fixed":"f79d0403ea20a81bc29105bba54fbcab54e8c403"},{"fixed":"0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31716.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.6.136"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.84"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.25"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31716.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"}]}