7.8

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

Analyzed
AliasesUBUNTU-CVE-2026-31683DEBIAN-CVE-2026-31683
Published 25-04-2026Last modified 05-08-2026

Vulnerability summary

CVE-2026-31683 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.12%
0%100%
Low · -0.06 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 32 · Related 32
OPENSUSE-SU-2026:20965-1SUSE-SU-2026:22099-1SUSE-SU-2026:22112-1SUSE-SU-2026:22117-1SUSE-SU-2026:22127-1USN-8567-1

Timeline

  1. 25-04-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

Decrease -0.06 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 67176c96f325837b0bb3e9538ca2eba414f447d8 | ≥ c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 0b10a8b355c3f71012ce89289ec2c2f5e3bfd6c1 | ≥ c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 6755347c5f9bdd44dee80f692208b056fcd40a52 | ≥ c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 1ada20331f2df2a942d6b83ae1f04a304b642e2a | ≥ c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 6e40ebb999c2c3d2fbb3cacb61f0384ee6e69075 | ≥ c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 0e35db29fc5a97a8553f7c2d3a2ba730e46b1ee8 | ≥ c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < eda89a1bae0602aec8314ced299bb243b9f9aeef | ≥ c6c8fea29769d998d94fcec9b9f14d4b52b349d3, < 0d4aef630be9d5f9c1227d07669c26c4383b5ad0 | 2.6.38
  • linux_kernel≥ 2.6.38, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.167 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.78 | ≥ 6.13, < 6.18.20 | ≥ 6.19, < 6.19.10 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.10-1

3 vendors · 160 products

References

39 links
Show all 39 references