CVE-2026-31683

batman-adv: avoid OGM aggregation when skb tailroom is insufficient

State: Published
Severity: 7.8 High
Published: Apr 25, 2026
Updated: Aug 5, 2026
Reserved: Mar 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 67176c96f325837b0bb3e9538ca2eba414f447d8Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 6755347c5f9bdd44dee80f692208b056fcd40a52Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 1ada20331f2df2a942d6b83ae1f04a304b642e2aAffected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8Affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before eda89a1bae0602aec8314ced299bb243b9f9aeefAffected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 0d4aef630be9d5f9c1227d07669c26c4383b5ad0Affected
LinuxLinux	2.6.38Affected before 2.6.38Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.167 through 6.1.Not affected 6.6.130 through 6.6.Not affected 6.12.78 through 6.12.Not affected 6.18.20 through 6.18.Not affected 6.19.10 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 67176c96f325837b0bb3e9538ca2eba414f447d8Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 6755347c5f9bdd44dee80f692208b056fcd40a52Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 1ada20331f2df2a942d6b83ae1f04a304b642e2aAffected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8Affected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before eda89a1bae0602aec8314ced299bb243b9f9aeefAffected
c6c8fea29769d998d94fcec9b9f14d4b52b349d3 to before 0d4aef630be9d5f9c1227d07669c26c4383b5ad0Affected

LinuxLinux

2.6.38Affected
before 2.6.38Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.167 through 6.1.*Not affected
6.6.130 through 6.6.*Not affected
6.12.78 through 6.12.*Not affected
6.18.20 through 6.18.*Not affected
6.19.10 through 6.19.*Not affected
7.0 and laterNot affected

References

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