Race condition in Linux kernel - CVE-2026-64095

Vulnerability identifier: #VU138542

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-2026-64095

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a race condition in the batman-adv bridge loop avoidance subsystem when handling concurrent backbone gateway state changes and request tracking. A local user can trigger concurrent operations to cause a denial of service.

The issue stems from non-atomic updates to request state and the bla.num_requests counter across multiple concurrent code paths.

Linux kernel
openEuler
Ubuntu
python3-perf-debuginfo
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
kernel-extra-modules
linux-ibm (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
python3-perf-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
bpftool - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-debugsource - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-headers - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-source - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
perf - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
python3-perf - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/1f013bc94154f2e78e97d0296175664224c796e0
• https://git.kernel.org/stable/c/45384612f29692fbf0c770200361a7acff90125c
• https://git.kernel.org/stable/c/461f1e3dfb888701895b766446c55db2b10db705
• https://git.kernel.org/stable/c/5328b95960774f2e189f22485616bc7b8eb2f7e3
• https://git.kernel.org/stable/c/65497ad155a3246df177b5ef662cd6e5a32cb470
• https://git.kernel.org/stable/c/83ab69bd12b80f6ea169c8bea6977701b53a043d
• https://git.kernel.org/stable/c/8ff9c59d1b7b48c2596878341a5310f32895d52b
• https://git.kernel.org/stable/c/a9393751ecf7e9096f93cb6eed02db4f79125765

• Race condition in Linux kernel batman-adv
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 22.03 LTS SP4 update for kernel