CVE-2026-31464

A flaw was found in the Linux kernel's scsi: ibmvfc driver. A malicious or compromised Virtual I/O (VIO) server can exploit this by sending a crafted response during target discovery. This response can cause an out-of-bounds memory access, leading to the disclosure of sensitive kernel memory.

Red Hat notes this issue is specific to IBM Power virtual Fibre Channel discovery where a hostile VIO server can inflate num_written and leak kernel memory embedded into subsequent MADs. Trusted infrastructure assumptions materially affect severity. Fixes arrive through kernel errata; customers not using ibmvfc can avoid loading the driver.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the ibmvfc module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.