ACK: [SRU][Q][PATCH 0/1] CVE-2026-53002

[Rickey Castillo]

On 7/16/26 18:54, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-53002
>
> [ Impact ]
>
> The SIP connection tracking helper in netfilter used sprintf() in
> mangle_content_len() to write into a stack buffer that could be too small to
> hold the formatted result. This caused a stack out-of-bounds write when
> mangling SDP content length during NAT of SIP INVITE requests. An attacker able
> to trigger this path could corrupt kernel stack memory, potentially leading to
> denial of service or remote code execution, as reflected by the CVSS score of
> 9.8.
>
> [ Fix ]
>
> questing: clean cherry-pick
> focal: clean cherry-pick
> bionic: clean cherry-pick
> xenial: backported with AI-assisted adaptation
> trusty: backported with AI-assisted adaptation
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression in the netfilter conntrack/NAT SIP helper could corrupt or
> mistruncate the Content-Length field during SDP mangling, breaking SIP call
> handling or NAT traversal for affected connections. Any error in the buffer
> sizing or scnprintf conversion would be confined to the SIP application-layer
> helper path.
>
Signed-off by Rickey Castillo <rickey.castillo.valenzuela at canonical.com>