CVE-2025-23131dlm: prevent NPD when writing a positive value to event_done
- 5.5MediumCVSS base score
- 0.19%Exploitation in 30 daysEPSS · top 91% 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: dlm: prevent NPD when writing a positive value to event_done do_uevent returns the value written to event_done. In case it is a positive value, new_lockspace would undo all the work, and lockspace would not be set. __dlm_new_lockspace, however, would treat that positive value as a success due to commit 8511a2728ab8 ("dlm: fix use count with multiple joins"). Down the line, device_create_lockspace would pass that NULL lockspace to dlm_find_lockspace_local, leading to a NULL pointer dereference. Treating such positive values as successes prevents the problem. Given this has been broken for so long, this is unlikely to break userspace expectations.
Timeline
ID reserved
By Linux
- 3 months later
· 3 months later
Published
- 19 months later
· 19 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 |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 8511a2728ab82cab398e39d019f5cf1246021c1c – < a1c41aebb184d9228a440dcb6761224e65b0e49a
- affected 8511a2728ab82cab398e39d019f5cf1246021c1c – < ee28d99d789b077565cbe0377374d1e826c64d93
- affected 8511a2728ab82cab398e39d019f5cf1246021c1c – < c7837e2c96559663c33f43da403d9cf3cf77cfa7
- affected 8511a2728ab82cab398e39d019f5cf1246021c1c – < 7109d69bec6edce546dc870e66bd2b668a3d5549
- affected 8511a2728ab82cab398e39d019f5cf1246021c1c – < 10b7a59814765d18d43555c9cef4eb3048b7e8a3
- affected 8511a2728ab82cab398e39d019f5cf1246021c1c – < b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c
- affected 8511a2728ab82cab398e39d019f5cf1246021c1c – < 8e2bad543eca5c25cd02cbc63d72557934d45f13
- affected 2.6.31
- unaffected < 2.6.31
- unaffected 5.10.260 – ≤ 5.10.*
- unaffected 5.15.211 – ≤ 5.15.*
- unaffected 6.1.177 – ≤ 6.1.*
- unaffected 6.6.144 – ≤ 6.6.*
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.14.2 – ≤ 6.14.*
- unaffected 6.15 – ≤ *
References
References8
- https://git.kernel.org/stable/c/a1c41aebb184d9228a440dcb6761224e65b0e49a (opens in a new tab)
- https://git.kernel.org/stable/c/ee28d99d789b077565cbe0377374d1e826c64d93 (opens in a new tab)
- https://git.kernel.org/stable/c/c7837e2c96559663c33f43da403d9cf3cf77cfa7 (opens in a new tab)
- https://git.kernel.org/stable/c/7109d69bec6edce546dc870e66bd2b668a3d5549 (opens in a new tab)
- https://git.kernel.org/stable/c/10b7a59814765d18d43555c9cef4eb3048b7e8a3 (opens in a new tab)
- https://git.kernel.org/stable/c/b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c (opens in a new tab)
- https://git.kernel.org/stable/c/8e2bad543eca5c25cd02cbc63d72557934d45f13 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (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-2025-11172 (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-2025-23131)Record last updated .