Critical 9.8Published Aug 15, 2026

CVE-2026-74401dlm: fix add msg handle in send_queue ordered

Updated under an hour ago (Oct 26, 2026, 10:40 PM ET)

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 489d8e559c6596eb08e16447d9830bc39afbe54e before ae9e534e502a0f48c12baf83608c5de0ff0eab11; from 489d8e559c6596eb08e16447d9830bc39afbe54e before 6369619f1b665f12d8c99cc6ff733c64eb08b22e; from 489d8e559c6596eb08e16447d9830bc39afbe54e before 712714f818d83373847874ab0f8e426be79296cf; 489d8e559c6596eb08e16447d9830bc39afbe54e builds before 4d45250b1d22960f86d83245be188b16e456218b; from 489d8e559c6596eb08e16447d9830bc39afbe54e before d2248cb70c070f8f04762872772e155b59016f17	CNA record

References

References

https://git.kernel.org/stable/c/ae9e534e502a0f48c12baf83608c5de0ff0eab11
https://git.kernel.org/stable/c/6369619f1b665f12d8c99cc6ff733c64eb08b22e
https://git.kernel.org/stable/c/712714f818d83373847874ab0f8e426be79296cf
https://git.kernel.org/stable/c/4d45250b1d22960f86d83245be188b16e456218b
https://git.kernel.org/stable/c/d2248cb70c070f8f04762872772e155b59016f17

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.