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.
How to fix
- Linux Linux58799078afebd5115e052bf69ad6697f9759dd6f, 38cd10b0aeec755d89f78722a2b83f4088ff0cb0, 811fea37620f2097955d95ce81cfdba03fd30f1b, e6640923afee619d9fa82b07394dc9498e202304, 6b4f521e01257387906f8b969ad3450d8208d4e2, 9e16b6751a8206de0b865d99bb02771e6751d12d, dbeb4145d9778f922f459935da9a027750765a69, 49df66b7993c80b80c7eb9a84ba5b3410c8296a0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | c6c8fea29769d998d94fcec9b9f14d4b52b349d3 ≤ v < 58799078afebd5115e052bf69ad6697f9759dd6f, c6c8fea29769d998d94fcec9b9f14d4b52b349d3 ≤ v < 38cd10b0aeec755d89f78722a2b83f4088ff0cb0, c6c8fea29769d998d94fcec9b9f14d4b52b349d3 ≤ v < 811fea37620f2097955d95ce81cfdba03fd30f1b, c6c8fea29769d998d94fcec9b9f14d4b52b349d3 ≤ v < e6640923afee619d9fa82b07394dc9498e202304, c6c8fea29769d998d94fcec9b9f14d4b52b349d3 ≤ v < 6b4f521e01257387906f8b969ad3450d8208d4e2, c6c8fea29769d998d94fcec9b9f14d4b52b349d3 ≤ v < 9e16b6751a8206de0b865d99bb02771e6751d12d, c6c8fea29769d998d94fcec9b9f14d4b52b349d3 ≤ v < dbeb4145d9778f922f459935da9a027750765a69, c6c8fea29769d998d94fcec9b9f14d4b52b349d3 ≤ v < 49df66b7993c80b80c7eb9a84ba5b3410c8296a0, 2.6.38 | 58799078afebd5115e052bf69ad6697f9759dd6f, 38cd10b0aeec755d89f78722a2b83f4088ff0cb0, 811fea37620f2097955d95ce81cfdba03fd30f1b, e6640923afee619d9fa82b07394dc9498e202304, 6b4f521e01257387906f8b969ad3450d8208d4e2, 9e16b6751a8206de0b865d99bb02771e6751d12d, dbeb4145d9778f922f459935da9a027750765a69, 49df66b7993c80b80c7eb9a84ba5b3410c8296a0 |
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