CVE-2026-74401dlm: fix add msg handle in send_queue ordered
- 9.8CriticalCVSS base score
- 0.70%Exploitation in 30 daysEPSS · top 46% 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: fix add msg handle in send_queue ordered In a benchmark scenario triggering a lot of requests that triggers a lot of DLM messages on the network it can be that the mh->seq is not ordered according the oldest seq number. This ordering is required by dlm_receive_ack as "before(mh->seq, seq)" will stop to check for older sequence numbers that are ordered in the tail of "node->send_queue". The side effects of not having it correct ordered regarding "before(mh->seq, seq)" are refcounting issues and use-after free. I only was able to reproduce this issue in a experimental DLM branch and a user space DLM benchmark that uses io_uring. After changing this I don't experienced any refcounting with the sending buffer issues anymore.
Timeline
ID reserved
By Linux
Published
- 3 months later
· 3 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 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.70% · top 46% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 489d8e559c6596eb08e16447d9830bc39afbe54e – < 482606fea302d8bab86901d7426c3716980d99a8
- affected 489d8e559c6596eb08e16447d9830bc39afbe54e – < ae9e534e502a0f48c12baf83608c5de0ff0eab11
- affected 489d8e559c6596eb08e16447d9830bc39afbe54e – < 6369619f1b665f12d8c99cc6ff733c64eb08b22e
- affected 489d8e559c6596eb08e16447d9830bc39afbe54e – < 712714f818d83373847874ab0f8e426be79296cf
- affected 489d8e559c6596eb08e16447d9830bc39afbe54e – < 4d45250b1d22960f86d83245be188b16e456218b
- affected 489d8e559c6596eb08e16447d9830bc39afbe54e – < d2248cb70c070f8f04762872772e155b59016f17
- affected 5.14
- unaffected < 5.14
- unaffected 6.1.191 – ≤ 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/482606fea302d8bab86901d7426c3716980d99a8 (opens in a new tab)
- https://git.kernel.org/stable/c/ae9e534e502a0f48c12baf83608c5de0ff0eab11 (opens in a new tab)
- https://git.kernel.org/stable/c/6369619f1b665f12d8c99cc6ff733c64eb08b22e (opens in a new tab)
- https://git.kernel.org/stable/c/712714f818d83373847874ab0f8e426be79296cf (opens in a new tab)
- https://git.kernel.org/stable/c/4d45250b1d22960f86d83245be188b16e456218b (opens in a new tab)
- https://git.kernel.org/stable/c/d2248cb70c070f8f04762872772e155b59016f17 (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-2026-59548 (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-2026-74401)Record last updated .