What’s Vulnerable › Vulnerabilities

CVE-2026-72235: batman-adv: retrieve ethhdr after potential skb realloc on RX

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: retrieve ethhdr after potential skb realloc on RX pskb_may_pull() in batadv_interface_rx() 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. This was done correctly for the VLAN header but missed for the ethernet header which is later used for the TT and AP isolation handling.

Affected products

• Linux kernel: 2.6.38 — 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/035e1fed892d3d06002a73ff73668f618a514644
• https://git.kernel.org/stable/c/2cefa5141cab8ec1e4b24cf585958b13f2e3049d
• https://git.kernel.org/stable/c/6abf73589bed3f27ee240c08108feb72bed0b9c6
• https://git.kernel.org/stable/c/6e189f14d1ea28db212b9d70a02131a7ce518012
• https://git.kernel.org/stable/c/85a71a81854e0e191ad0e533eabb4eff54866feb
• https://git.kernel.org/stable/c/a1820344b180cb55af748f102bc536b5c93164db
• https://git.kernel.org/stable/c/b031fc97e1993d29d6c3a0e86a99140528cf31e8
• https://git.kernel.org/stable/c/f19259395b44af67f3c274e34237c295b526b859

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