ACK: [SRU][Q][PATCH 0/1] CVE-2026-53151

[Rickey Castillo]

On 7/16/26 21:33, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-53151
>
> [ Impact ]
>
> AF_RXRPC assumes it can call skb_condense() and then validly access the SACK
> table as a flat buffer directly from skb->data, but skb_condense() can silently
> fail to do anything under some circumstances. This leads to modification of the
> received skbuff in rxrpc_input_soft_acks() and a potential incorrect access of
> the buffer in a fragmented UDP packet when AF_RXRPC extracts the contents of
> the SACK table. A deliberately pre-generated fragmented packet could trigger
> the incorrect buffer access.
>
> [ Fix ]
>
> questing: clean cherry-pick
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression in this fix could affect the rxrpc networking subsystem,
> potentially causing incorrect ACK processing or misparsing of SACK tables in
> AF_RXRPC connections used by AFS clients.
>
Signed-off-by: Rickey Castillo <rickey.castillo.valenzuela at canonical.com>