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Vulnerability record · CVE-2026-31683 · published 25 April 2026

CVE-2026-31683: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6%
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-31683), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.