CVE-2026-68396 scsi: core: wake eh reliably when using scsi_schedule_eh
A race condition in the Linux kernel SCSI core can prevent the error handler from waking, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68396?
CVE-2026-68396 is a vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
scsi: core: wake eh reliably when using scsi_schedule_eh
Drivers which use the scsi_schedule_eh function to run the error handler currently risk the error handler thread never waking once all commands are timed out or inactive. There is no enforced memory order between setting the host into error recovery state and counting busy commands. This can result in a race with scsi_dec_host_busy where neither CPU sees both conditions of all commands inactive and the host error state to request waking the error handler.
To fix this, run the scsi_schedule_eh's scsi_eh_wakeup from a new work item which will use rcu to ensure scsi_schedule_eh's call to scsi_host_busy will occur after the error state is globally visible and will be seen by any current scsi_dec_host_busy callers.
Which versions are affected by CVE-2026-68396?
How do I fix CVE-2026-68396?
Apply the vendor's patch.
Is CVE-2026-68396 being exploited?
There is no known exploitation of CVE-2026-68396 in the wild and no public exploit code.
Sources
Also known as AZL-94823, BELL-CVE-2026-68396, DEBIAN-CVE-2026-68396, GHSA-g3vc-2pr6-9v45, UBUNTU-CVE-2026-68396.