# CVE-2026-31464

> Vulnerability · severity: **HIGH** (CVSS 8.1).

## 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.

## Key facts

- **CVE ID:** CVE-2026-31464
- **Published:** 2026-04-22
- **CVSS severity:** HIGH
- **CVSS base score:** 8.1
- **CWE codes:** CWE-125

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31464

## Citation

> AI Analytics. CVE-2026-31464. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-31464. Derived from NIST NVD. Licensed CC0.

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