CVE-2026-53062

Local service interruption via SMQ invalidation race

Published Jun 24, 2026 · Updated Jun 24, 2026

Improper locking in the Linux Kernel allows local users to corrupt data or destabilize the system through concurrent dm-cache writes. The smq_invalidate_mapping path omits locking while multiple workers remove mappings, racing the allocated-block counter and freeing internal structures during use. The path requires an existing dm-cache mapping that uses the SMQ policy in passthrough mode and concurrent writes to clean cached blocks.

CVSS severity7.8
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper locking in the Linux Kernel allows local users to corrupt data or destabilize the system through concurrent dm-cache writes. The smq_invalidate_mapping path omits locking while multiple workers remove mappings, racing the allocated-block counter and freeing internal structures during use. The path requires an existing dm-cache mapping that uses the SMQ policy in passthrough mode and concurrent writes to clean cached blocks.

The record

CVE
CVE-2026-53062
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
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

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=4.12
  2. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <1b2bec4a7dcf5f00b7a1cbeeec8997841d783513
  3. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <2b62d0611c9af14a16bddf22df2612b4f40eb5a1
  4. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45
  5. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <4991b5a08751e2e82488fb93ae08849b6aea10d9
  6. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <93627a29d4b66d4a2def938dfb8610cc80ae454b
  7. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e
  8. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <ac5ee99443891bdb161f5539606a66a1b5e72542
  9. Affected versionversion=b29d4986d0da1a27cd35917cdb433672f5c95d7f <c348ae47d8e65f06429fa41adce9ad986b696766

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.12; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <1b2bec4a7dcf5f00b7a1cbeeec8997841d783513; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <2b62d0611c9af14a16bddf22df2612b4f40eb5a1; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <4991b5a08751e2e82488fb93ae08849b6aea10d9; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <93627a29d4b66d4a2def938dfb8610cc80ae454b; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <ac5ee99443891bdb161f5539606a66a1b5e72542; version=b29d4986d0da1a27cd35917cdb433672f5c95d7f <c348ae47d8e65f06429fa41adce9ad986b696766

Published CVSS scores

7.8kernel.orgCVSS: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

CWE-667Improper Locking
T1499.004Endpoint Denial of Service: Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo