APPLIED[N:hwe-6.17]: [SRU][Q][PATCH 0/1] CVE-2026-53088

[Edoardo Canepa]

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

On 7/17/26 04:57, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-53088
>
> [ Impact ]
>
> The bcmgenet driver had an off-by-one error in bcmgenet_put_txcb(). The
> write_ptr points to the next open tx_cb, but the function returned the tx_cb
> before rewinding the pointer, so the wrong tx_cb was returned. This caused the
> transmit control block to be cleaned up incorrectly, which could lead to memory
> corruption or other undefined behavior in the network path.
>
> [ Fix ]
>
> questing: clean cherry-pick
> focal: clean cherry-pick
> bionic: clean cherry-pick
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression in this fix would affect the bcmgenet Ethernet driver's transmit
> path, potentially causing incorrect handling of tx control blocks, dropped
> packets, or improper cleanup of DMA-mapped fragments on affected Broadcom GENET
> hardware.
>
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