CVE-2026-46095 md/md-llbitmap: raise barrier before state machine transition
A race condition in the Linux kernel's md/llbitmap module could allow state machine transitions to occur before barriers are raised, potentially leading to undefined behavior.
- 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-2026-46095?
CVE-2026-46095 is a medium-severity vulnerability in Linux kernel, published on 27 May 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:
md/md-llbitmap: raise barrier before state machine transition
Move the barrier raise operation before calling llbitmap_state_machine() in both llbitmap_start_write() and llbitmap_start_discard(). This ensures the barrier is in place before any state transitions occur, preventing potential race conditions where the state machine could complete before the barrier is properly raised.
Which versions are affected by CVE-2026-46095?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46095?
Apply the vendor's patch.
Is CVE-2026-46095 being exploited?
There is no known exploitation of CVE-2026-46095 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-46095, DEBIAN-CVE-2026-46095, GHSA-qghx-f73p-v22r, UBUNTU-CVE-2026-46095.