CVE-2026-93104 RDMA/rvt: Return NULL after port allocation failure
A use-after-free in the Linux kernel RDMA driver allows attackers to cause a denial of service or potentially execute code via port allocation failure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93104?
CVE-2026-93104 is an use after free 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/rvt: Return NULL after port allocation failure
rvt_alloc_device() deallocates the IB device when its port array cannot be allocated but then returns the pointer to the released allocation. Callers treat any non-NULL value as valid and dereference it, resulting in a use-after-free.
Return NULL immediately after deallocation so callers can propagate the allocation failure.
Which versions are affected by CVE-2026-93104?
How do I fix CVE-2026-93104?
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-2026-93104 being exploited?
There is no known exploitation of CVE-2026-93104 in the wild and no public exploit code.
Sources
Also known as AZL-102669, BELL-CVE-2026-93104, DEBIAN-CVE-2026-93104, GHSA-wqhx-qpfw-hj6x, UBUNTU-CVE-2026-93104.