ACK: [SRU][Q][PATCH 0/1] CVE-2026-52999

[Edoardo Canepa]

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

On 7/16/26 16:25, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2026-52999
>
> [ Impact ]
>
> In nf_osf_match(), the nf_osf_hdr_ctx structure is initialized once and passed
> by reference to nf_osf_match_one() for each fingerprint checked. During TCP
> option parsing, nf_osf_match_one() advances the shared ctx->optp pointer
> without restoring it after an early return on a perfect match. When
> NF_OSF_LOGLEVEL_ALL is configured, subsequent fingerprint checks start parsing
> from the end of the options buffer, causing an out-of-bounds read of garbage
> data. This results in incorrect or missing match logging.
>
> [ Fix ]
>
> questing: clean cherry-pick
> focal: clean cherry-pick
>
> [ Test Plan ]
>
> Boot tested.
>
> [ Where Problems Could Occur ]
>
> A regression in the netfilter nfnetlink_osf module could affect OS fingerprint
> matching, potentially causing incorrect passive OS detection results or
> breaking connections filtered by osf rules.
>
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