Improper locking in Linux kernel - CVE-2026-53331

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Main Vulnerability Database Vulnerabilities #VU136721

Improper locking in Linux kernel - CVE-2026-53331

Published: July 2, 2026


Vulnerability identifier: #VU136721
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53331
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper lock handling in qcom_slim_ngd_ssr_pdr_notify() and slim_report_absent() when processing SSR/PDR down notifications. A local user can trigger the vulnerable locking sequence to cause a denial of service.

The issue arises from inconsistent lock ordering between ctrl->tx_lock and ctrl->lock, creating a possible deadlock.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-53331

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

External References

Related Security Bulletins