CVE-2026-31464 scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
A malicious VIO server can trigger an out-of-bounds read in the ibmvfc driver, leaking kernel memory to the attacker.
- 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-2026-31464?
CVE-2026-31464 is a high-severity vulnerability in Linux kernel, published on 22 Apr 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:
scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
A malicious or compromised VIO server can return a num_written value in the discover targets MAD response that exceeds max_targets. This value is stored directly in vhost->num_targets without validation, and is then used as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which is only allocated for max_targets entries. Indices at or beyond max_targets access kernel memory outside the DMA-coherent allocation. The out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI MADs that are sent back to the VIO server, leaking kernel memory.
Fix by clamping num_written to max_targets before storing it.
Weakness: CWE-125
Which versions are affected by CVE-2026-31464?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31464?
Apply the vendor's patch.
Is CVE-2026-31464 being exploited?
There is no known exploitation of CVE-2026-31464 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31464, DEBIAN-CVE-2026-31464, GHSA-5q5q-53h5-v4v4, ROOT-OS-DEBIAN-11-CVE-2026-31464, ROOT-OS-DEBIAN-12-CVE-2026-31464, ROOT-OS-DEBIAN-13-CVE-2026-31464 and 3 more.