CVE-2026-31716: Linux kernel · fs/ntfs3: validate rec->used in journal-replay file record check
Affects Linux kernelSource GCVE Database
Not known to be exploited · CVSS 7.8 High.
Data as of 11 Nov 2026, 23:24 UTC
Thin evidence
One scorer or none| CNA (Linux) | CVSS 3.1 | 7.8 |
|---|
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 1 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.
Description
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate rec->used in journal-replay file record check check_file_record() validates rec->total against the record size but never validates rec->used. The do_action() journal-replay handlers read rec->used from disk and use it to compute memmove lengths: DeleteAttribute: memmove(attr, ..., used - asize - roff) CreateAttribute: memmove(..., attr, used - roff) change_attr_size: memmove(..., used - PtrOffset(rec, next)) When rec->used is smaller than the offset of a validated attribute, or larger than the record size, these subtractions can underflow allowing us to copy huge amounts of memory in to a 4kb buffer, generally considered a bad idea overall. This requires a corrupted filesystem, which isn't a threat model the kernel really needs to worry about, but checking for such an obvious out-of-bounds value is good to keep things robust, especially on journal replay Fix this up by bounding rec->used correctly. This is much like commit b2bc7c44ed17 ("fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot") which checked different values in this same switch statement.
References
- git.kernel.org/stable/c/8e64d33198b5a0fb14a452708bad844f94f03b2c (opens in a new tab)
- git.kernel.org/stable/c/1393a467a9607e62123806de7d4c3a3e54e396a9 (opens in a new tab)
- git.kernel.org/stable/c/f90b8a1798b750755a9e9aee66678f0a1820bbaf (opens in a new tab)
- git.kernel.org/stable/c/4b1613d7e2deda831a97e427d1ea586e50fe1be5 (opens in a new tab)
- git.kernel.org/stable/c/0112e6279420d4005b3d57af36fb45c01b8d0116 (opens in a new tab)
- git.kernel.org/stable/c/f79d0403ea20a81bc29105bba54fbcab54e8c403 (opens in a new tab)
- git.kernel.org/stable/c/0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b (opens in a new tab)