CVE-2026-43262 gfs2: fiemap page fault fix
A recursive lock issue in the Linux kernel GFS2 filesystem can cause a denial of service when accessing memory-mapped fiemap buffers.
- 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-2026-43262?
CVE-2026-43262 is a medium-severity denial of service vulnerability in Linux kernel, published on 6 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:
gfs2: fiemap page fault fix
In gfs2_fiemap(), we are calling iomap_fiemap() while holding the inode glock. This can lead to recursive glock taking if the fiemap buffer is memory mapped to the same inode and accessing it triggers a page fault.
Fix by disabling page faults for iomap_fiemap() and faulting in the buffer by hand if necessary.
Fixes xfstest generic/742.
Weakness: CWE-401
Which versions are affected by CVE-2026-43262?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43262?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-43262 being exploited?
There is no known exploitation of CVE-2026-43262 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43262, DEBIAN-CVE-2026-43262, GHSA-h2mh-m9gx-72x5, ROOT-OS-DEBIAN-11-CVE-2026-43262, ROOT-OS-UBUNTU-2204-CVE-2026-43262, ROOT-OS-UBUNTU-2404-CVE-2026-43262 and 1 more.