CVE-2026-72232

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: ensure minimal ethernet header on TX As documented in commit 8bd67ebb50c0 ("net: bridge: xmit: make sure we have at least eth header len bytes"), it is possible by for a local user with eBPF TC hook access to attach a tc filter which truncates the packet and redirects to an batadv interface. But the code assumes that at least ETH_HLEN bytes are available and thus might read outside of the available buffer. The batadv_interface_tx() must therefore always check itself if enough data is available for the ethernet header and don't rely on min_header_len.

References

• https://git.kernel.org/stable/c/38cd10b0aeec755d89f78722a2b83f4088ff0cb0
• https://git.kernel.org/stable/c/49df66b7993c80b80c7eb9a84ba5b3410c8296a0
• https://git.kernel.org/stable/c/58799078afebd5115e052bf69ad6697f9759dd6f
• https://git.kernel.org/stable/c/6b4f521e01257387906f8b969ad3450d8208d4e2
• https://git.kernel.org/stable/c/811fea37620f2097955d95ce81cfdba03fd30f1b