APPLIED[N:hwe-6.17]: [SRU][Q][PATCH 0/1] CVE-2026-52914

[Edoardo Canepa]

Applied to n:linux/hwe-6.17-next. Thanks.

On 7/16/26 15:23, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-52914
>
> [ Impact ]
>
> batman-adv keeps a running payload length for queued fragments and uses it to
> validate a fragment chain before reassembly. The accounting allows the
> accumulated fragment length to be truncated during updates, so malformed
> fragment chains can bypass the intended validation and drive reassembly with
> inconsistent length state. This leads to a local denial of service.
>
> [ Fix ]
>
> questing: clean cherry-pick
> focal: clean cherry-pick
> bionic: backported with AI-assisted adaptation
> xenial: backported with AI-assisted adaptation
> trusty: backported with AI-assisted adaptation
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression in this fix would affect the batman-adv mesh networking subsystem,
> specifically fragment reassembly. Incorrect length accounting could cause valid
> fragmented packets to be dropped or fail to reassemble correctly.
>
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