CVE-2026-46189 RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path
A double free vulnerability in the Linux kernel's pvrdma driver allows attackers to cause a denial of service or potentially execute arbitrary code.
- 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-2026-46189?
CVE-2026-46189 is a high-severity use after free vulnerability in Linux kernel, published on 28 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:
RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path
Sashiko points out that pvrdma_uar_free() is already called within pvrdma_dealloc_ucontext(), so calling it before triggers a double free.
Which versions are affected by CVE-2026-46189?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46189?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-46189 being exploited?
There is no known exploitation of CVE-2026-46189 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88914, BELL-CVE-2026-46189, DEBIAN-CVE-2026-46189, GHSA-xxxv-9j5g-vqfc, ROOT-OS-DEBIAN-11-CVE-2026-46189, ROOT-OS-DEBIAN-12-CVE-2026-46189 and 3 more.