CVE-2026-80600: batman-adv: dat: acquire ARP hw source only after skb realloc

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-28 · updated 2026-08-29

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: dat: acquire ARP hw source 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: 5.1 — 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/01678c53a7717a748aee388b6839e7b9761d641c
https://git.kernel.org/stable/c/059a70e1d12d6d99310e0599d37b0323557569a8
https://git.kernel.org/stable/c/3404be97b940a9b1ae1aea5fdbc6cdbbe9cd5146
https://git.kernel.org/stable/c/3b4c70c40f2e135a50cd38fc61c7d23a296a9981
https://git.kernel.org/stable/c/48067b2ae4504500a7093d9e1e16b42e70330480
https://git.kernel.org/stable/c/86aa79b43e5b561fd3648891165bd7313b541315
https://git.kernel.org/stable/c/a82fc217cb7a447313c76ebf9f09b100771b0ddf
https://git.kernel.org/stable/c/d755cd001fa2c248e186c1fc3df3d11d97dc843c

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