CVE-2026-92495 RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap
Local attackers can bypass write restrictions on RDMA driver memory pages via mprotect, potentially leading to privilege escalation.
- 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-2026-92495?
CVE-2026-92495 is a 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:
RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap
bnxt_re_mmap() rejects VM_WRITE for the DBR_PAGE and TOGGLE_PAGE mmap flags, but a read-only mapping can still retain VM_MAYWRITE. nd later be upgraded with mprotect(PROT_WRITE). This can bypass the write check that only runs at mmap time.
Clear VM_MAYWRITE before vm_insert_page() in the shared DBR/toggle-page branch, matching the existing policy that userspace writes are not expected for these pages.
Which versions are affected by CVE-2026-92495?
How do I fix CVE-2026-92495?
Apply the vendor's patch.
Is CVE-2026-92495 being exploited?
There is no known exploitation of CVE-2026-92495 in the wild and no public exploit code.
Sources
Also known as AZL-102434, BELL-CVE-2026-92495, DEBIAN-CVE-2026-92495, GHSA-mw3g-rrrf-x4m2, UBUNTU-CVE-2026-92495.