Bug 2516678 (CVE-2026-72228)

Summary: CVE-2026-72228 kernel: batman-adv: frag: fix primary_if leak on failed linearization
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the `batman-adv` component of the Linux kernel. This vulnerability occurs during the processing of network packets that have fragmented data. Specifically, if a packet's fragmented data fails a preparation step called linearization, a reference to a network interface (`primary_if`) is not properly released, leading to a memory leak. This issue could potentially be exploited by a local attacker to cause resource exhaustion, resulting in a Denial of Service (DoS) for the system.
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Description OSIDB Bzimport 2026-08-15 06:25:24 UTC 
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.
Comment 1 Keith Grant 2026-08-18 16:40:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081548-CVE-2026-72228-fe10@gregkh/T