{"cve":"CVE-2026-31716","nvd":{"published":"2026-05-01T14:16:21.743","modified":"2026-06-17T10:34:17.913","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate rec->used in journal-replay file record check\n\ncheck_file_record() validates rec->total against the record size but\nnever validates rec->used.  The do_action() journal-replay handlers read\nrec->used 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->used 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->used 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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-787"],"references":["https://git.kernel.org/stable/c/0112e6279420d4005b3d57af36fb45c01b8d0116","https://git.kernel.org/stable/c/0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b","https://git.kernel.org/stable/c/1393a467a9607e62123806de7d4c3a3e54e396a9","https://git.kernel.org/stable/c/4b1613d7e2deda831a97e427d1ea586e50fe1be5","https://git.kernel.org/stable/c/8e64d33198b5a0fb14a452708bad844f94f03b2c"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:33:09.003606135+00:00"},"epss":{"cve":"CVE-2026-31716","score":0.00128,"percentile":0.02458,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}