CVE-2026-74401Critical· 9.8▾ MidnightIn 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 th…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.7%
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.
Linux >= 489d8e559c6596eb08e16447d9830bc39afbe54e < ae9e534e502a0f48c12baf83608c5de0ff0eab11Linux >= 489d8e559c6596eb08e16447d9830bc39afbe54e < 6369619f1b665f12d8c99cc6ff733c64eb08b22eLinux >= 489d8e559c6596eb08e16447d9830bc39afbe54e < 712714f818d83373847874ab0f8e426be79296cfLinux >= 489d8e559c6596eb08e16447d9830bc39afbe54e < 4d45250b1d22960f86d83245be188b16e456218bLinux >= 489d8e559c6596eb08e16447d9830bc39afbe54e < d2248cb70c070f8f04762872772e155b59016f17Linux 5.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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