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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 58799078afebd5115e052bf69ad6697f9759dd6f; >= c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 38cd10b0aeec755d89f78722a2b83f4088ff0cb0; >= c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 811fea37620f2097955d95ce81cfdba03fd30f1b; >= c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < e6640923afee619d9fa82b07394dc9498e202304; >= c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 6b4f521e01257387906f8b969ad3450d8208d4e2; >= c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 9e16b6751a8206de0b865d99bb02771e6751d12d; >= c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < dbeb4145d9778f922f459935da9a027750765a69; >= c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 49df66b7993c80b80c7eb9a84ba5b3410c8296a0 |
| Linux | Linux | 2.6.38 |
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
- https://git.kernel.org/stable/c/9e16b6751a8206de0b865d99bb02771e6751d12d
- https://git.kernel.org/stable/c/dbeb4145d9778f922f459935da9a027750765a69
- https://git.kernel.org/stable/c/e6640923afee619d9fa82b07394dc9498e202304
Timeline
- Published
- Aug 15, 2026
- Last modified
- Oct 16, 2026
- NVD status
- Received