What’s Vulnerable › Vulnerabilities

CVE-2026-64094: batman-adv: bla: avoid NULL-ptr deref for claim via dropped interface

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-08-11
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid NULL-ptr deref for claim via dropped interface Without rtnl_lock held, a hardif might be retrieved as primary interface of a meshif, but then (while operating on this interface) getting decoupled from the mesh interface. In this case, the meshif still exists but the pointer from the primary hardif to the meshif is set to NULL. The mesh_iface must be checked first to be non-NULL before continuing to send an ARP request using meshif.

Affected products

• Linux kernel: from 3.5 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.34 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.12.93, 6.18.34, 6.6.143

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.12.93. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0f3ebd7bb417aabc44853cc7c2a184ebb0e05b45
• https://git.kernel.org/stable/c/2a8c9e86529156c62d9187b9ed9454c31665ad33
• https://git.kernel.org/stable/c/4f6266735a0ba6a568b6d4c9fa51c33a5a7f2d70
• https://git.kernel.org/stable/c/53cb3511f6eda37d3bd923545fdba6013b6d7bb7
• https://git.kernel.org/stable/c/555b8d3f5c313d81d46274fd0976352dafc80124
• https://git.kernel.org/stable/c/6921a7683ae9ad0208d829e71f725a9e25ccff49
• https://git.kernel.org/stable/c/efb62458c94db1fe3a287e7e89c31b0cfb03f938
• https://git.kernel.org/stable/c/f80d3d98d2ff78d9e2fe5d68b1f45948c4f7bd24

Get alerted when CVE-2026-64094 or the next vulnerability affects your stack