ACK: [SRU][Q][PATCH 0/1] CVE-2026-52958

[Edoardo Canepa]

Acked-by: Edoardo Canepa <edoardo.canepa at canonical.com>

On 7/16/26 14:32, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-52958
>
> [ Impact ]
>
> When decoding osd_state and osd_weight from an incoming osdmap in
> osdmap_decode(), both are decoded for each osd, i.e., map->max_osd times. The
> ceph_decode_need() check only accounts for sizeof(*map->osd_weight) once. This
> can potentially result in an out-of-bounds memory access if the incoming
> message is corrupted such that the max_osd value exceeds the actual content of
> the osdmap message.
>
> [ Fix ]
>
> questing: clean cherry-pick
> focal: clean cherry-pick
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression in this fix could affect the libceph subsystem's osdmap decoding,
> potentially causing valid osdmap messages to be rejected or mishandled during
> decode. This could impact Ceph client connectivity and mount reliability.
>
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