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Vulnerability record · CVE-2026-31464 · published 22 April 2026

CVE-2026-31464: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

8.1 CVSS 3.1 High EPSS 0.42% · top 66.3% CWE-125 · Out-of-bounds read
8.1CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 Patch
https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161 Patch
https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f Patch
https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983 Patch
https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc Patch
https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db Patch
https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780 Patch
https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31464), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.