APPLIED[N:hwe-6.17]: [SRU][Q][PATCH 0/1] CVE-2026-52993

[Edoardo Canepa]

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

On 7/16/26 18:01, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-52993
>
> [ Impact ]
>
> A double-free flaw exists in the TIPC subsystem in tipc_buf_append().
> tipc_msg_validate() can reallocate the skb it is validating, freeing the old
> one, but the function was called with a pointer to a local copy of the caller's
> skb pointer. If the skb was reallocated and validation subsequently failed, the
> error handling path would free the already-freed original skb pointer, leading
> to a double-free that can corrupt kernel memory.
>
> [ Fix ]
>
> questing: clean cherry-pick
> focal: backported with AI-assisted adaptation
> bionic: backported with AI-assisted adaptation
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> An incorrect fix could mishandle skb reassignment in the TIPC message
> reassembly path, potentially causing memory leaks, use-after-free, or dropped
> packets. Any regression would be confined to systems using the TIPC networking
> protocol.
>
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