CVE-2026-46327 dm: fix unlocked test for dm_suspended_md
A race condition in the Linux kernel device mapper allows attackers to cause a denial of service by exploiting an unlocked suspension check.
- 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-2026-46327?
CVE-2026-46327 is a high-severity vulnerability in Linux kernel, published on 9 Jun 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:
dm: fix unlocked test for dm_suspended_md
The function dm_blk_report_zones tests if the device is suspended with the "dm_suspended_md" call. However, this function is called without holding any locks, so the device may be suspended just after it.
Move the call to dm_suspended_md after dm_get_live_table, so that the device can't be suspended after the suspended state was tested.
Weakness: CWE-362
Which versions are affected by CVE-2026-46327?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46327?
Apply the vendor's patch.
Is CVE-2026-46327 being exploited?
There is no known exploitation of CVE-2026-46327 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-46327, DEBIAN-CVE-2026-46327, GHSA-w5j4-wm72-f9fp, UBUNTU-CVE-2026-46327.