APPLIED[HWE-6.17/N/J]/Cmnt: [SRU][Q/N/J][PATCH 0/3] CVE-2026-52924

[Stefan Bader]

On 16/07/2026 14:42, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-52924
> 
> [ Impact ]
> 
> When an SCTP association receives a Stale Cookie ERROR, it is rolled back from
> COOKIE_ECHOED to COOKIE_WAIT. During this rollback, sctp_stream_update() frees
> the old stream table and installs a new one but does not invalidate
> stream->out_curr, which may still point to a freed sctp_stream_out entry. SCTP
> scheduler dequeue paths (FCFS, RR, PRIO, etc.) rely on stream->out_curr->ext,
> leading to a use-after-free once the old stream state has been released. A
> local attacker could exploit this to crash the system or potentially execute
> arbitrary code.
> 
> [ Fix ]
> 
> questing: clean cherry-pick
> noble: clean cherry-pick
> jammy: clean cherry-pick
> focal: clean cherry-pick
> bionic: clean cherry-pick
> 
> [ Test Plan ]
> 
> Boot tested.
> 
> [ Where Problems Could Occur ]
> 
> A defect in this fix could affect the SCTP protocol subsystem, particularly
> association setup and stale COOKIE-ECHO handling, potentially causing dropped
> transmit or retransmit state or connection setup failures.
> 

Applied to noble,jammy:linux/master-next and 
noble:linux-hwe-6.17/hwe-6.17-next. Thanks.

-Stefan
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