High 7.8Published Apr 25, 2026

CVE-2026-31683batman-adv: avoid OGM aggregation when skb tailroom is insufficient

Updated under an hour ago (Oct 27, 2026, 7:10 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 67176c96f325837b0bb3e9538ca2eba414f447d8; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 6755347c5f9bdd44dee80f692208b056fcd40a52; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 1ada20331f2df2a942d6b83ae1f04a304b642e2a; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before eda89a1bae0602aec8314ced299bb243b9f9aeef; from c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 0d4aef630be9d5f9c1227d07669c26c4383b5ad0	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.38 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.10; 7.0; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/67176c96f325837b0bb3e9538ca2eba414f447d8	patch
https://git.kernel.org/stable/c/0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1	patch
https://git.kernel.org/stable/c/6755347c5f9bdd44dee80f692208b056fcd40a52	patch
https://git.kernel.org/stable/c/1ada20331f2df2a942d6b83ae1f04a304b642e2a	patch
https://git.kernel.org/stable/c/6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075	patch
https://git.kernel.org/stable/c/0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8	patch
https://git.kernel.org/stable/c/eda89a1bae0602aec8314ced299bb243b9f9aeef	patch
https://git.kernel.org/stable/c/0d4aef630be9d5f9c1227d07669c26c4383b5ad0	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.