Race condition in Linux kernel - CVE-2026-45973

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Main Vulnerability Database Vulnerabilities #VU132514

Race condition in Linux kernel - CVE-2026-45973

Published: May 28, 2026


Vulnerability identifier: #VU132514
CSH Severity: Low
CVSS v4 BT: 4.3 [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/E:U/U:Clear]
CVE-ID: CVE-2026-45973
CWE-ID: CWE-362
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 a race condition in the RDMA/mlx5 driver bond device handling when unloading the device during a firmware reset in LAG mode. A local user can trigger device teardown during this state to cause a denial of service.

The issue can cause the driver to hang indefinitely while waiting for UMR completion because completions never arrive.


Affected software

Linux kernel
Ubuntu
openEuler
bpftool
kernel
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-extra-modules
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
linux (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi-realtime (Ubuntu package)

How to mitigate CVE-2026-45973

Install security update from vendor's repository.

bpftool - update to 6.6.0-145.3.15.146
kernel - update to 6.6.0-145.3.15.146
python3-perf-debuginfo - update to 6.6.0-145.3.15.146
python3-perf - update to 6.6.0-145.3.15.146
perf-debuginfo - update to 6.6.0-145.3.15.146
perf - update to 6.6.0-145.3.15.146
kernel-tools-devel - update to 6.6.0-145.3.15.146
kernel-tools-debuginfo - update to 6.6.0-145.3.15.146
kernel-tools - update to 6.6.0-145.3.15.146
kernel-source - update to 6.6.0-145.3.15.146
kernel-headers - update to 6.6.0-145.3.15.146
kernel-extra-modules - update to 6.6.0-145.3.15.146
kernel-devel - update to 6.6.0-145.3.15.146
kernel-debugsource - update to 6.6.0-145.3.15.146
kernel-debuginfo - update to 6.6.0-145.3.15.146
bpftool-debuginfo - update to 6.6.0-145.3.15.146
linux (Ubuntu package) - addressed in versions 6.8.0-134.134, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61+fips1, 6.8.0-1058.61~22.04.1, 6.8.0-1060.61, 6.8.0-1060.63+fips1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69, 6.8.0-1063.69+fips1, 6.8.1-1055.56, 6.8.1-1055.56~22.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 6.8.0-134.134+fips1, 6.8.0-1062.69+fips1
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1029.30
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1045.48, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61.1, 6.8.0-1058.64, 6.8.0-1060.61~22.04.1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69~22.04.1
linux-raspi (Ubuntu package) - update to 6.8.0-1060.64
linux-azure-fde (Ubuntu package) - update to 6.8.0-1062.69
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1063.71, 6.8.0-1063.71~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2049.50

External References

Related Security Bulletins