CVE-2026-90383 misc: sgi-gru: remove interrupt-context page-table walks
A race condition in the Linux kernel GRU driver allows unsafe page-table walks, potentially causing system instability or crashes.
- 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-2026-90383?
CVE-2026-90383 is a high-severity vulnerability in Linux, published on 17 Sep 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:
misc: sgi-gru: remove interrupt-context page-table walks
The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user page tables and supports only PMD-level large mappings on x86-64.
Remove the direct walker. Send interrupt faults directly to user polling mode so the existing call-OS fallback retries them in process context.
Remove the mmap-lock failure statistic that can no longer be incremented.
Which versions are affected by CVE-2026-90383?
How do I fix CVE-2026-90383?
Apply the vendor's patch.
Is CVE-2026-90383 being exploited?
There is no known exploitation of CVE-2026-90383 in the wild and no public exploit code.
Sources
Also known as AZL-102504, BELL-CVE-2026-90383, DEBIAN-CVE-2026-90383, GHSA-7rgr-4pj5-r396, UBUNTU-CVE-2026-90383.