CVE-2026-31683

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc6c8fea29769d998d94fcec9b9f14d4b52b349d3 < 67176c96f325837b0bb3e9538ca2eba414f447d8affected
LinuxLinuxc6c8fea29769d998d94fcec9b9f14d4b52b349d3 < 0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1affected
LinuxLinuxc6c8fea29769d998d94fcec9b9f14d4b52b349d3 < 6755347c5f9bdd44dee80f692208b056fcd40a52affected
LinuxLinuxc6c8fea29769d998d94fcec9b9f14d4b52b349d3 < 1ada20331f2df2a942d6b83ae1f04a304b642e2aaffected
LinuxLinuxc6c8fea29769d998d94fcec9b9f14d4b52b349d3 < 6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075affected
LinuxLinuxc6c8fea29769d998d94fcec9b9f14d4b52b349d3 < 0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8affected
LinuxLinuxc6c8fea29769d998d94fcec9b9f14d4b52b349d3 < eda89a1bae0602aec8314ced299bb243b9f9aeefaffected
LinuxLinuxc6c8fea29769d998d94fcec9b9f14d4b52b349d3 < 0d4aef630be9d5f9c1227d07669c26c4383b5ad0affected
LinuxLinux2.6.38affected
LinuxLinux0 < 2.6.38unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.167 <= 6.1.*unaffected
LinuxLinux6.6.130 <= 6.6.*unaffected
LinuxLinux6.12.78 <= 6.12.*unaffected
LinuxLinux6.18.20 <= 6.18.*unaffected
LinuxLinux6.19.10 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References