batman-adv: ensure minimal ethernet header on TX

Summary

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.

Timeline

1. Aug 15, 2026, 5:54 AM UTCCVE published
2. Oct 16, 2026, 6:44 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 16, 2026, 6:45 PM UTCRecord last updated

Affected versions

• Linux Linux

  From c6c8fea29769d998d94fcec9b9f14d4b52b349d3 · fixed in 58799078afebd5115e052bf69ad6697f9759dd6f; From c6c8fea29769d998d94fcec9b9f14d4b52b349d3 · fixed in 38cd10b0aeec755d89f78722a2b83f4088ff0cb0; From c6c8fea29769d998d94fcec9b9f14d4b52b349d3 · fixed in 811fea37620f2097955d95ce81cfdba03fd30f1b; From c6c8fea29769d998d94fcec9b9f14d4b52b349d3 · fixed in e6640923afee619d9fa82b07394dc9498e202304; From c6c8fea29769d998d94fcec9b9f14d4b52b349d3 · fixed in 6b4f521e01257387906f8b969ad3450d8208d4e2; From c6c8fea29769d998d94fcec9b9f14d4b52b349d3 · fixed in 9e16b6751a8206de0b865d99bb02771e6751d12d; From c6c8fea29769d998d94fcec9b9f14d4b52b349d3 · fixed in dbeb4145d9778f922f459935da9a027750765a69; From c6c8fea29769d998d94fcec9b9f14d4b52b349d3 · fixed in 49df66b7993c80b80c7eb9a84ba5b3410c8296a0

• Linux Linux

  2.6.38

• KernelLinux

  From 2.6.38 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8