ACK: [SRU][Q][PATCH 0/1] CVE-2026-53088

[Bethany Jamison]

On 7/16/26 9:57 PM, 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.
>
Signed-off-by: Bethany Jamison <bethany.jamison at canonical.com>