ACK: [SRU][Q][PATCH 0/1] CVE-2026-53046

[Alice C. Munduruca]

On Thu Jul 16, 2026 at 6:57 PM EDT, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-53046
>
> [ Impact ]
>
> ksmbd_crypt_message() sets a NULL completion callback on AEAD requests and does
> not handle the -EINPROGRESS return code from async hardware crypto engines like
> the Qualcomm Crypto Engine (QCE). When QCE returns -EINPROGRESS, ksmbd treats
> it as an error and immediately frees the request while the hardware DMA
> operation is still in flight. The DMA completion callback then dereferences
> freed memory, causing a use-after-free and NULL pointer crash. This can lead to
> a remote crash or potential memory corruption on affected systems.
>
> [ Fix ]
>
> questing: clean cherry-pick
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression would manifest in the ksmbd SMB3 server, affecting encrypted
> connections that rely on AEAD crypto requests. If the fix is incorrect, it
> could cause hangs or crashes during message encryption/decryption, particularly
> on systems using async hardware crypto engines.

Acked-by: Alice C. Munduruca <alice.munduruca at canonical.com>