CVE-2026-68173

In the Linux kernel, the following vulnerability has been resolved: ublk: wait on ublkdevready instead of ub-completion ub-completion is only re-armed by a successful STARTUSERRECOVERY. If the ublk server sends ENDUSERRECOVERY without one - e.g. its START failed with -EBUSY and the error was...

CVE-2026-68173

CVE-2026-68173 affects the Linux kernel ublk subsystem. The root cause is that ub->completion is an edge-triggered latch used as a proxy for the readiness condition; when a server sends END_USER_RECOVERY without a preceding START_USER_RECOVERY, the wait can be satisfied by a stale completion, ...