Race condition in Linux kernel - CVE-2026-72340

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Main Vulnerability Database Vulnerabilities #VU143096

Race condition in Linux kernel - CVE-2026-72340

Published: August 16, 2026


Vulnerability identifier: #VU143096
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72340
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to corrupt hardware rule entries.

The vulnerability exists due to a race condition in the microchip vcap api and debugfs rule dump handling when accessing shared Super VCAP instances concurrently. A local user can trigger concurrent rule dump and rule write operations to corrupt hardware rule entries.

The issue affects sparx5 and lan969x devices where IS0 and IS2 instances share the same Super VCAP hardware block, cache, and command registers.


Affected software

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

How to mitigate CVE-2026-72340

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1

External References

Related Security Bulletins