APPLIED: [SRU][J][PATCH 0/1] CVE-2025-27558

[Stefan Bader]

On 23/06/2026 11:09, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2025-27558
> 
> [ Impact ]
> 
> A flaw in the IEEE 802.11 standard allows A-MSDU spoofing attacks against mesh
> networks, a variant of CVE-2020-24588 (FragAttacks) that the original standard
> update failed to address. An adversary can turn a standard MSDU into an A-MSDU,
> injecting arbitrary packets and bypassing frame authentication on mesh
> networks. This affects the mac80211 wireless subsystem and can be exploited to
> spoof traffic in any mesh network deployment.
> 
> [ Fix ]
> 
> jammy: backported with AI-assisted adaptation
> focal: backported with AI-assisted adaptation
> bionic: backported with AI-assisted adaptation
> 
> [ Test Plan ]
> 
> Boot tested.
> 
> [ Where Problems Could Occur ]
> 
> If the fix is incorrect, the mac80211 A-MSDU parsing logic could misclassify
> legitimate mesh frames as attacks and drop them, breaking normal mesh network
> connectivity. Errors in calculating the Mesh Control header length could also
> affect both four-address and six-address mesh configurations.
> 

Applied to jammy:linux/master-next. Thanks.

-Stefan
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