Linux Ker: Batman-adv OGM aggregation skb overflow fix
CVE-2026-31683 Published on April 25, 2026
batman-adv: avoid OGM aggregation when skb tailroom is insufficient
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: avoid OGM aggregation when skb tailroom is insufficient
When OGM aggregation state is toggled at runtime, an existing forwarded
packet may have been allocated with only packet_len bytes, while a later
packet can still be selected for aggregation. Appending in this case can
hit skb_put overflow conditions.
Reject aggregation when the target skb tailroom cannot accommodate the new
packet. The caller then falls back to creating a new forward packet
instead of appending.
Products Associated with CVE-2026-31683
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Affected Versions
Linux:- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 67176c96f325837b0bb3e9538ca2eba414f447d8 is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1 is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 6755347c5f9bdd44dee80f692208b056fcd40a52 is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 1ada20331f2df2a942d6b83ae1f04a304b642e2a is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075 is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8 is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below eda89a1bae0602aec8314ced299bb243b9f9aeef is affected.
- Version c6c8fea29769d998d94fcec9b9f14d4b52b349d3 and below 0d4aef630be9d5f9c1227d07669c26c4383b5ad0 is affected.
- Version 2.6.38 is affected.
- Before 2.6.38 is unaffected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.167, <= 6.1.* is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.78, <= 6.12.* is unaffected.
- Version 6.18.20, <= 6.18.* is unaffected.
- Version 6.19.10, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.