CVE-2026-53265 (GCVE-0-2026-53265)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:41
VLAI
Title
dm cache policy smq: check allocation under invalidate lock
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4991b5a08751e2e82488fb93ae08849b6aea10d9 , < c242c7af2aecf0b538b8623bdb86b8b441da38d9 (git)
Affected: 1b2bec4a7dcf5f00b7a1cbeeec8997841d783513 , < 13da856c86fb8c2ccab95034fd77da1bb2c2a17c (git)
Affected: 9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e , < d886945fcb0f8c9dc6b39928d7a96c95c587346c (git)
Affected: ac5ee99443891bdb161f5539606a66a1b5e72542 , < b4892561552d671bd8c4da5ebb70e9fbb1ec446e (git)
Affected: 93627a29d4b66d4a2def938dfb8610cc80ae454b , < 03ffe1112ed88bb3a9bd0b971549bf4d64bfc59a (git)
Affected: c348ae47d8e65f06429fa41adce9ad986b696766 , < 42ff6774ecd9d7f70d599cb71ff64373a1da4948 (git)
Affected: 2b62d0611c9af14a16bddf22df2612b4f40eb5a1 , < c57570fba24016ec25ec046ab44db39143fb7a64 (git)
Affected: 2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45 , < d3f0a606b9f278ece8a0df626ded9c4044071235 (git)
Create a notification for this product.
Linux Linux Affected: 5.10.258 , < 5.10.259 (semver)
Affected: 5.15.209 , < 5.15.210 (semver)
Affected: 6.1.175 , < 6.1.176 (semver)
Affected: 6.6.141 , < 6.6.143 (semver)
Affected: 6.12.91 , < 6.12.94 (semver)
Affected: 6.18.33 , < 6.18.36 (semver)
Affected: 7.0.10 , < 7.0.13 (semver)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T07:25:00+00:00",
      "cve": "CVE-2026-53265",
      "id": "CVE-2026-53265",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm cache policy smq: check allocation under invalidate lock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53265.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-01T03:16:45Z",
      "cve": "CVE-2026-53265",
      "id": "CVE-2026-53265",
      "initial_release_date": "2026-06-26T02:08:08Z",
      "product_status:known_not_affected": "291",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53265",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53265.json",
      "version": "5"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.