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Vulnerability record · CVE-2026-53265 · published 25 June 2026

CVE-2026-53265: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: dm cache policy smq: check allocation under invalidate lock commit 2d1f7b65f5de ("dm cache policy smq: fix missing locks in invalidating cache blocks") added mq->lock around the destructive part of smq_invalidate_mapping(), but left the e->allocated check outside the critical section. That leaves a check-then-act race. Two concurrent invalidators can both observe e->allocated as true before either of them takes mq->lock. The first invalidator that acquires the lock removes the entry from the queues and hash table and then calls free_entry(), which clears e->allocated and puts the entry back on the free list. The second invalidator can then acquire mq->lock and continue with the stale result of the unlocked check. This can corrupt the SMQ queues or hash table by deleting an entry that is no longer on those structures. It can also hit the allocation check in free_entry() when the same entry is freed again. Move the allocation check under mq->lock so the predicate and the destructive operations are serialized by the same lock.

7.8 CVSS 3.1 High EPSS 0.12% · top 98.4%
7.8CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: dm cache policy smq: check allocation under invalidate lock commit 2d1f7b65f5de ("dm cache policy smq: fix missing locks in invalidating cache blocks") added mq->lock around the destructive part of smq_invalidate_mapping(), but left the e->allocated check outside the critical section. That leaves a check-then-act race. Two concurrent invalidators can both observe e->allocated as true before either of them takes mq->lock. The first invalidator that acquires the lock removes the entry from the queues and hash table and then calls free_entry(), which clears e->allocated and puts the entry back on the free list. The second invalidator can then acquire mq->lock and continue with the stale result of the unlocked check. This can corrupt the SMQ queues or hash table by deleting an entry that is no longer on those structures. It can also hit the allocation check in free_entry() when the same entry is freed again. Move the allocation check under mq->lock so the predicate and the destructive operations are serialized by the same lock.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/03ffe1112ed88bb3a9bd0b971549bf4d64bfc59a Patch
https://git.kernel.org/stable/c/13da856c86fb8c2ccab95034fd77da1bb2c2a17c Patch
https://git.kernel.org/stable/c/42ff6774ecd9d7f70d599cb71ff64373a1da4948 Patch
https://git.kernel.org/stable/c/b4892561552d671bd8c4da5ebb70e9fbb1ec446e Patch
https://git.kernel.org/stable/c/c242c7af2aecf0b538b8623bdb86b8b441da38d9 Patch
https://git.kernel.org/stable/c/c57570fba24016ec25ec046ab44db39143fb7a64 Patch
https://git.kernel.org/stable/c/d3f0a606b9f278ece8a0df626ded9c4044071235 Patch
https://git.kernel.org/stable/c/d886945fcb0f8c9dc6b39928d7a96c95c587346c Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53265), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.