CVE-2026-72196fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass
- 8.4HighCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass In log_replay()'s analysis pass, after find_dp() returns a valid DIR_PAGE_ENTRY for the (target_attr, target_vcn) tuple, the copy_lcns block walks lrh->lcns_follow further entries: t16 = le16_to_cpu(lrh->lcns_follow); for (i = 0; i < t16; i++) { size_t j = (size_t)(le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn)); dp->page_lcns[j + i] = lrh->page_lcns[i]; } find_dp() only validates that target_vcn falls within [dp->vcn, dp->vcn + dp->lcns_follow), i.e., that the FIRST cluster is covered. The walk through the further entries is not bounded against dp->lcns_follow. For a malformed LRH where target_vcn = dp->vcn + dp->lcns_follow - 1 and lrh->lcns_follow > 1, the i > 0 writes overflow the dp's allocated page_lcns[] array. Add the missing j + lrh->lcns_follow <= dp->lcns_follow guard. Reproduced under UML+KASAN on mainline 8d90b09e6741 as a slab-out-of-bounds write of size 8 from log_replay+0x68d4 on the mount path. This is distinct from Pavitra Jha's 2026-05-02 patch ("fs/ntfs3: validate lcns_follow in log_replay conversion", <[email protected]>) which addresses the separate version-0 dirty-page-table conversion path's memmove(&dp->vcn, ...) call. The two fixes are complementary; both should land. [[email protected]: clang-formatted the changes, fixed conflicts]
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Affected products
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 9b3d8cc9d54fcded4de51b2b1026ae7182512077
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 9b7c28d8c61bdb041936222a09a708531a1c2921
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 0f13e823bf86bd1800168ea0bb5bca8b8500a81c
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < d240cd98f5f7b65c90f6b2b6abe3232ccdc405ab
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 49c86dae0c0ccb8d98ddcdc46987259389c816dd
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 5e7b598660cfa8e5af172cf4c65cffc126333307
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/9b3d8cc9d54fcded4de51b2b1026ae7182512077 (opens in a new tab)
- https://git.kernel.org/stable/c/9b7c28d8c61bdb041936222a09a708531a1c2921 (opens in a new tab)
- https://git.kernel.org/stable/c/0f13e823bf86bd1800168ea0bb5bca8b8500a81c (opens in a new tab)
- https://git.kernel.org/stable/c/d240cd98f5f7b65c90f6b2b6abe3232ccdc405ab (opens in a new tab)
- https://git.kernel.org/stable/c/49c86dae0c0ccb8d98ddcdc46987259389c816dd (opens in a new tab)
- https://git.kernel.org/stable/c/5e7b598660cfa8e5af172cf4c65cffc126333307 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-58954 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-72196)Record last updated .