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Review reviewHigh

CVE-2026-53265

Linux 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 c...

CVSS
7.8
EPSS
0.12%
2.18% percentile
CISA KEV
Not listed
Published
2026.06.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.12%
Technical severityCVSS 7.8

Vulnerability overview

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 c...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
4991b5a08751e2e82488fb93ae08849b6aea10d9, 1b2bec4a7dcf5f00b7a1cbeeec8997841d783513, 9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e, ac5ee99443891bdb161f5539606a66a1b5e72542, 93627a29d4b66d4a2def938dfb8610cc80ae454b, c348ae47d8e65f06429fa41adce9ad986b696766, 2b62d0611c9af14a16bddf22df2612b4f40eb5a1, 2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45, 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10, >= 6.6.141 < 6.6.143, >= 6.12.91 < 6.12.94, >= 6.18.33 < 6.18.36, >= 7.0.10 < 7.0.13, 7.1
Fixed versions
6.6.143, 6.12.94, 6.18.36, 7.0.13

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-53265 — Linux Linux, linux kernel | SECUFOCUS NOW