CVE-2026-74390 RDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs
A local attacker can trigger an out-of-bounds write in the Linux kernel's irdma driver, potentially leading to code execution or 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-2026-74390?
CVE-2026-74390 is a high-severity memory corruption vulnerability in Linux, published on 15 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: Fix out-of-bounds write in irdma_copy_user_pgaddrs
The irdma_copy_user_pgaddrs function loops through all of the umem DMA blocks to populate the PBLEs and will stop when either the last DMA block is reached or palloc->total_cnt is reached. The issue is that the logic for checking palloc->total_cnt would only work for non-zero values.
When irdma_setup_pbles is called with lvl==0, it calls irdma_copy_user_pgaddrs with palloc->total_cnt==0, which means the only way to break out of the loop is to reach the last umem DMA block, which means it could end up going beyond the fixed size of 4 iwmr->pgaddrmem array that is used in the lvl==0 case.
In the case of QP/CQ/SRQ rings, the value of lvl is determined by a separate input (for example, req.cq_pages in the case of a CQ). So, we must perform explicit checking to ensure we don't overflow the pgaddrmem array if the user provides a umem that consists of more blocks than their provided req.cq_pages.
Which versions are affected by CVE-2026-74390?
How do I fix CVE-2026-74390?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74390 being exploited?
There is no known exploitation of CVE-2026-74390 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74390, DEBIAN-CVE-2026-74390, GHSA-c23v-2w7h-h6m9, UBUNTU-CVE-2026-74390.