CVE-2026-80601: batman-adv: gw: acquire ethernet header only after skb realloc

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-28 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: gw: acquire ethernet header only after skb realloc The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer behind the skb. Variables which were pointing to the old buffer need to be reassigned to avoid an use-after-free.

Affected products

Linux kernel: 3.14 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/2760b38222c8828b075802342fe3b91eb823d542
https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6
https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518
https://git.kernel.org/stable/c/916dac5f2944f63f07f7b501acbea6737dbbed0e
https://git.kernel.org/stable/c/afac8096bde4948e3caa7e4dd733867cfbd3018e
https://git.kernel.org/stable/c/b79884a5567bf788fb76c30832467cf6a56f3c0d
https://git.kernel.org/stable/c/e3f4325e35dd6e76b80665f3510738ce34819753
https://git.kernel.org/stable/c/e6b43acd34b219b807e65096ce207b087942779d

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