CVE-2026-68418 RDMA/irdma: Prevent user-triggered null deref on QP create
A local attacker can trigger a null pointer dereference in the Linux kernel RDMA driver, causing a system crash.
- 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-2026-68418?
CVE-2026-68418 is a vulnerability in Linux, published on 10 Aug 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/irdma: Prevent user-triggered null deref on QP create
Previously, the user QP creation path would only attempt to populate iwqp->iwpbl if the user-provided req.user_wqe_bufs field was non-zero. The problem is that iwqp->iwpbl is unconditionally dereferenced later on in irdma_setup_virt_qp.
While there was a check for iwqp->iwpbl != NULL, this check would only occur if req.user_wqe_bufs was non-zero. The end result is that a user could send a zero user_wqe_bufs value and trigger a null ptr deref.
Fix this by unconditionally calling irdma_get_pbl and bailing if it fails, similar to the CQ and SRQ paths.
Which versions are affected by CVE-2026-68418?
How do I fix CVE-2026-68418?
Apply the vendor's patch.
Is CVE-2026-68418 being exploited?
There is no known exploitation of CVE-2026-68418 in the wild and no public exploit code.
Sources
Also known as AZL-95085, BELL-CVE-2026-68418, DEBIAN-CVE-2026-68418, GHSA-pfxp-3rpf-8hx8, UBUNTU-CVE-2026-68418.