CVE-2026-98587 firewire: cdev: fix back-transition for iso_resource_auto client resource
A race condition in the Linux kernel firewire driver allows local attackers to cause a state transition error, potentially leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98587?
CVE-2026-98587 is a vulnerability in Linux, published on 18 Oct 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:
firewire: cdev: fix back-transition for iso_resource_auto client resource
The todo member of iso_resource_auto structure represents the state of the client resource and normally transitions in the following order:
ISO_RES_AUTO_ALLOC -> ISO_RES_AUTO_REALLOC -> ISO_RES_AUTO_DEALLOC
However, concurrent access from the work item and the file descriptor release function can cause the state to transition backwards from ISO_RES_AUTO_DEALLOC to ISO_RES_AUTO_REALLOC.
Prevent the back-transition by checking the current state before updating it in the work item.
Which versions are affected by CVE-2026-98587?
How do I fix CVE-2026-98587?
Apply the vendor's patch.
Is CVE-2026-98587 being exploited?
There is no known exploitation of CVE-2026-98587 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-98587, GHSA-7hq7-xmgm-jjr4, UBUNTU-CVE-2026-98587.