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

What is CVE-2026-64094?

CVE-2026-64094 is a medium-severity vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-476

Which versions are affected by CVE-2026-64094?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64094?

Apply the vendor's patch.

Is CVE-2026-64094 being exploited?

There is no known exploitation of CVE-2026-64094 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-64094, DEBIAN-CVE-2026-64094, GHSA-7pc5-4w4m-mhg6, ROOT-OS-UBUNTU-2204-CVE-2026-64094, UBUNTU-CVE-2026-64094.