APPLIED[N:hwe-6.17]: [SRU][Q][PATCH 0/1] CVE-2026-53260

[Edoardo Canepa]

Applied to n:linux/hwe-6.17-next. Thanks.

On 7/17/26 17:24, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-53260
>
> [ Impact ]
>
> A race condition exists in reqsk_queue_hash_req() in the TCP stack. On
> PREEMPT_RT kernels, the function can be preempted between mod_timer() and
> refcount_set(), allowing the request socket timer to fire and abort the reqsk
> before its refcounts are initialized. This leads to a refcount underflow and
> use-after-free of the request socket, which an attacker could exploit to
> compromise the system (CVSS 9.8).
>
> [ Fix ]
>
> questing: backported with AI-assisted adaptation
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A mistake in this fix could disrupt TCP request socket handling in the inet
> connection sock subsystem, potentially causing incorrect timer or refcount
> behavior during connection establishment, which may result in dropped
> connections or socket leaks.
>
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