APPLIED[N:hwe-6.17]: [SRU][Q][PATCH 0/1] CVE-2026-53309

[Edoardo Canepa]

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

On 7/17/26 15:05, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-53309
>
> [ Impact ]
>
> The ocfs2 DLM code contains an off-by-one error in dlm_match_regions().
> When comparing local versus remote regions, the comparison loop uses
> '<=' instead of '<', causing it to read one entry past the valid range
> of qr_regions. This out-of-bounds read during region matching can lead
> to incorrect region validation or a crash, affecting the reliability of
> ocfs2 clustered filesystems.
>
> [ Fix ]
>
> questing: clean cherry-pick
> focal: clean cherry-pick
> bionic: clean cherry-pick
> xenial: clean cherry-pick
> trusty: clean cherry-pick
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression in this fix would affect the ocfs2/dlm region matching
> logic, potentially causing valid regions to be rejected and nodes to
> fail joining the DLM domain, which would disrupt ocfs2 cluster mounts.
>
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