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CVE-2026-72228: batman-adv: frag: fix primary_if leak on failed linearization

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-17

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: frag: fix primary_if leak on failed linearization If the skb has a frag_list, it must be linearized before it can be split using skb_split(). But when this step failed, it must not only free the skb but also take care of the reference to the already found primary_if.

Affected products

• Linux kernel: from 5.10.117 before 5.10.261; from 5.15.41 before 5.15.212; from 4.14.280 before 4.15; from 4.19.244 before 4.20; from 5.4.195 before 5.5; from 5.17.9 before 5.18 — fixed in 4.15, 4.20, 5.10.261, 5.15.212, 5.18, 5.5

How to fix

Upgrade to a fixed version: Linux kernel 4.15, 4.20, 5.10.261, 5.15.212. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/353d2c1d5492e53ae34f490a84494124dc3d3531
• https://git.kernel.org/stable/c/4f3bf293f7662500142234ae6f23725953690bc9
• https://git.kernel.org/stable/c/777a88256d6f70672116e53400659cc417e1feaa
• https://git.kernel.org/stable/c/a90f4fff9025371bce5371daa610af957de8dd6a
• https://git.kernel.org/stable/c/c1b28432fd6345e0d2308f39c507ed5750c265d2
• https://git.kernel.org/stable/c/d2148aeee93197ccf821114489775132f28eebf5
• https://git.kernel.org/stable/c/db3c700826e8126fbdaa83468a9c4ee4ee65319f
• https://git.kernel.org/stable/c/e59b1960f71521ce4eb4397c4e82f5285601ab57

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