CVE-2026-74401
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.
How to fix
- Linux Linux482606fea302d8bab86901d7426c3716980d99a8, ae9e534e502a0f48c12baf83608c5de0ff0eab11, 6369619f1b665f12d8c99cc6ff733c64eb08b22e, 712714f818d83373847874ab0f8e426be79296cf, 4d45250b1d22960f86d83245be188b16e456218b, d2248cb70c070f8f04762872772e155b59016f17 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 489d8e559c6596eb08e16447d9830bc39afbe54e ≤ v < 482606fea302d8bab86901d7426c3716980d99a8, 489d8e559c6596eb08e16447d9830bc39afbe54e ≤ v < ae9e534e502a0f48c12baf83608c5de0ff0eab11, 489d8e559c6596eb08e16447d9830bc39afbe54e ≤ v < 6369619f1b665f12d8c99cc6ff733c64eb08b22e, 489d8e559c6596eb08e16447d9830bc39afbe54e ≤ v < 712714f818d83373847874ab0f8e426be79296cf, 489d8e559c6596eb08e16447d9830bc39afbe54e ≤ v < 4d45250b1d22960f86d83245be188b16e456218b, 489d8e559c6596eb08e16447d9830bc39afbe54e ≤ v < d2248cb70c070f8f04762872772e155b59016f17, 5.14 | 482606fea302d8bab86901d7426c3716980d99a8, ae9e534e502a0f48c12baf83608c5de0ff0eab11, 6369619f1b665f12d8c99cc6ff733c64eb08b22e, 712714f818d83373847874ab0f8e426be79296cf, 4d45250b1d22960f86d83245be188b16e456218b, d2248cb70c070f8f04762872772e155b59016f17 |
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