ACK: [SRU][Q/N/J][PATCH 0/3] CVE-2026-53246

[Alessio Faina]

On Fri, Jul 17, 2026 at 06:32:04PM +0300, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-53246
> 
> [ Impact ]
> 
> When a listening SCTP server processes a COOKIE_ECHO chunk, the cached peer
> INIT chunk embedded after the cookie is parsed and its parameters are later
> walked without validating the chunk header length against the remaining
> COOKIE_ECHO buffer. If the length field is inflated, the parameter walk can run
> beyond the actual received data, leading to out-of-bounds reads and potential
> memory corruption during later parameter handling. This is remotely triggerable
> and carries a CVSS score of 9.8.
> 
> [ Fix ]
> 
> questing: backported with AI-assisted adaptation
> noble: backported with AI-assisted adaptation
> jammy: backported with AI-assisted adaptation
> focal: backported with AI-assisted adaptation
> bionic: backported with AI-assisted adaptation
> xenial: backported with AI-assisted adaptation
> trusty: backported with AI-assisted adaptation
> 
> [ Test Plan ]
> 
> Boot tested.
> 
> [ Where Problems Could Occur ]
> 
> A regression in this change could affect SCTP association setup, since the
> added bounds check in sctp_unpack_cookie() gates COOKIE_ECHO processing. An
> overly strict check could cause valid COOKIE_ECHO chunks to be rejected,
> breaking legitimate SCTP connections.
> 
> -- 
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team

Acked-by: Alessio Faina <alessio.faina at canonical.com>