Race condition in Linux kernel - CVE-2026-72118

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Main Vulnerability Database Vulnerabilities #VU143474

Race condition in Linux kernel - CVE-2026-72118

Published: August 16, 2026


Vulnerability identifier: #VU143474
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72118
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local attacker to cause incorrect procfs statistics output.

The vulnerability exists due to a race condition in bcm_rx_handler() and related CAN BCM statistics handling in net/can/bcm.c when processing concurrent CAN frame reception on different CPUs for the same rx operation. A local attacker can trigger concurrent CAN frame processing to cause incorrect procfs statistics output.

For rx operations subscribed on all interfaces, concurrent handling on different CPUs can cause frames_filtered to become larger than frames_abs, leading to a bogus or even negative reduction percentage in procfs.


Affected software

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

How to mitigate CVE-2026-72118

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
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