[SRU][Q/J][PATCH 0/2] CVE-2026-53086

[Cengiz Can]

https://ubuntu.com/security/CVE-2026-53086

[ Impact ]

The bcmgenet_timeout handler in the Broadcom GENET Ethernet driver attempts to
take down all TX queues when a single queue times out. This over zealous
behavior causes many race conditions with queues that are still actively
processing traffic. The resulting races can lead to instability in the network
driver's transmit path.

[ Fix ]

questing: clean cherry-pick
jammy: backported with AI-assisted adaptation
bionic: backported with AI-assisted adaptation

[ Test Plan ]

Boot tested.

[ Where Problems Could Occur ]

An incorrect fix could affect the TX path of the bcmgenet Ethernet driver,
potentially causing dropped packets, stalled transmit queues, or failure to
recover from a genuine queue timeout.