CVE-2026-53265

Kernel state corruption via unlocked allocation check

Published Jun 25, 2026 · Updated Jun 25, 2026

Race condition in the Linux Kernel dm-cache SMQ policy allows local users to corrupt queue or hash-table state during concurrent invalidation. smq_invalidate_mapping() tests e->allocated before taking mq->lock, so a second invalidator can act on a freed entry and delete it again. Exploitation requires low-privileged local access and concurrent invalidation of the same allocated SMQ entry; consequences include data-structure corruption and an allocation-check failure.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux Kernel dm-cache SMQ policy allows local users to corrupt queue or hash-table state during concurrent invalidation. smq_invalidate_mapping() tests e->allocated before taking mq->lock, so a second invalidator can act on a freed entry and delete it again. Exploitation requires low-privileged local access and concurrent invalidation of the same allocated SMQ entry; consequences include data-structure corruption and an allocation-check failure.

The record

CVE
CVE-2026-53265
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1b2bec4a7dcf5f00b7a1cbeeec8997841d783513 <13da856c86fb8c2ccab95034fd77da1bb2c2a17c
  2. Affected versionversion=2b62d0611c9af14a16bddf22df2612b4f40eb5a1 <c57570fba24016ec25ec046ab44db39143fb7a64
  3. Affected versionversion=2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45 <d3f0a606b9f278ece8a0df626ded9c4044071235
  4. Affected versionversion=4991b5a08751e2e82488fb93ae08849b6aea10d9 <c242c7af2aecf0b538b8623bdb86b8b441da38d9
  5. Affected versionversion=5.10.258 <5.10.259
  6. Affected versionversion=5.15.209 <5.15.210
  7. Affected versionversion=6.1.175 <6.1.176
  8. Affected versionversion=6.12.91 <6.12.94
  9. Affected versionversion=6.18.33 <6.18.36
  10. Affected versionversion=6.6.141 <6.6.143
  11. Affected versionversion=7.0.10 <7.0.13
  12. Affected versionversion=93627a29d4b66d4a2def938dfb8610cc80ae454b <03ffe1112ed88bb3a9bd0b971549bf4d64bfc59a
  13. Affected versionversion=9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e <d886945fcb0f8c9dc6b39928d7a96c95c587346c
  14. Affected versionversion=ac5ee99443891bdb161f5539606a66a1b5e72542 <b4892561552d671bd8c4da5ebb70e9fbb1ec446e
  15. Affected versionversion=c348ae47d8e65f06429fa41adce9ad986b696766 <42ff6774ecd9d7f70d599cb71ff64373a1da4948

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1b2bec4a7dcf5f00b7a1cbeeec8997841d783513 <13da856c86fb8c2ccab95034fd77da1bb2c2a17c; version=2b62d0611c9af14a16bddf22df2612b4f40eb5a1 <c57570fba24016ec25ec046ab44db39143fb7a64; version=2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45 <d3f0a606b9f278ece8a0df626ded9c4044071235; version=4991b5a08751e2e82488fb93ae08849b6aea10d9 <c242c7af2aecf0b538b8623bdb86b8b441da38d9; version=5.10.258 <5.10.259; version=5.15.209 <5.15.210; version=6.1.175 <6.1.176; version=6.12.91 <6.12.94; version=6.18.33 <6.18.36; version=6.6.141 <6.6.143; version=7.0.10 <7.0.13; version=93627a29d4b66d4a2def938dfb8610cc80ae454b <03ffe1112ed88bb3a9bd0b971549bf4d64bfc59a; version=9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e <d886945fcb0f8c9dc6b39928d7a96c95c587346c; version=ac5ee99443891bdb161f5539606a66a1b5e72542 <b4892561552d671bd8c4da5ebb70e9fbb1ec446e; version=c348ae47d8e65f06429fa41adce9ad986b696766 <42ff6774ecd9d7f70d599cb71ff64373a1da4948

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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