CVE-2026-31464

Advisory lineage Upstream: 0 Downstream: 5
Analyzed
Published: 22 Apr 2026, 13:53
Last modified:11 May 2026, 22:09

Vulnerability Summary

Overall Risk (default)
medium
32/100
CVSS Score
8.1 HIGH
v3.1 (cve.org)
EPSS Score
0.27% LOW
0% probability +0.24%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 Apr 2026, 13:53
Published
Vulnerability first disclosed
11 May 2026, 22:09
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•HIGH•Score: 8.1CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Trends

Current EPSS score: 0.27%• Percentile: 19%

Techniques & Countermeasures

  • CWE-125•Out-of-bounds Read

    The product reads data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < d842348f8a00d5b1d7358f207eb34ffcf5b16df3 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < a007246cb6c9ebdc93dafbf63cc2d43d98f402cc | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 4ed727e35b0ab17d3eeeb1e8023768396e2be161 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < d1466bf991b2343cf2ba8336e440c8faf3cbb780 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 786f10b1966e485046839f992e89f2c18cbd1983 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < bae4df0a643fa7f84663473aa3082a9c2ed139db | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f | 2.6.27

  • linux•linux_kernel

    ≥ 2.6.27, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.131 | ≥ 6.7, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5

References (8)