CVE-2026-53064

System crash via invalid dm-cache cell unlock

Published Jun 24, 2026 · Updated Jun 24, 2026

NULL pointer dereference in Linux Kernel dm-cache allows local users to crash the system through concurrent writes in passthrough mode. When a bio prison cell lock fails during cache-entry invalidation, invalidate_complete() unconditionally unlocks and frees the NULL mg->cell pointer. Exploitation requires low-privilege local access, a dm-cache device in passthrough mode with a cached block, and concurrent writes to that block; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
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

NULL pointer dereference in Linux Kernel dm-cache allows local users to crash the system through concurrent writes in passthrough mode. When a bio prison cell lock fails during cache-entry invalidation, invalidate_complete() unconditionally unlocks and frees the NULL mg->cell pointer. Exploitation requires low-privilege local access, a dm-cache device in passthrough mode with a cached block, and concurrent writes to that block; the bounded consequence is a kernel crash.

The record

CVE
CVE-2026-53064
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.12
  2. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <01264a6a3a3ad7ac1d73443299cd5a9568002454
  3. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <0aa745fea1f8dc81bcdd0a45e215b6706727b482
  4. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <25dcc1989c194ba2b5fb6d03cbb9b83814ac0d15
  5. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <7d1f98d668ee34c1d15bdc0420fdd062f24a27c0
  6. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <a2635d541a93fd111e743cf14b6275dc81be2abc
  7. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <c7fb6bc864c4910b344dafa36dd5028e9b980768
  8. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <df3b8ef06cc62de4fca5d2108e285085b3cffd44
  9. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <ee38fb00e1a80f46a4990e38f25ecb04ae7b7417

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.12; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <01264a6a3a3ad7ac1d73443299cd5a9568002454; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <0aa745fea1f8dc81bcdd0a45e215b6706727b482; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <25dcc1989c194ba2b5fb6d03cbb9b83814ac0d15; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <7d1f98d668ee34c1d15bdc0420fdd062f24a27c0; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <a2635d541a93fd111e743cf14b6275dc81be2abc; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <c7fb6bc864c4910b344dafa36dd5028e9b980768; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <df3b8ef06cc62de4fca5d2108e285085b3cffd44; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <ee38fb00e1a80f46a4990e38f25ecb04ae7b7417

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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