SB20260424262 - Out-of-bounds read in Linux kernel scsi ibmvscsi driver
Published: April 24, 2026
Security Bulletin ID
SB20260424262
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-31464)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in ibmvfc_alloc_targets() when processing a discover targets MAD response from a VIO server. A remote attacker can return a crafted num_written value exceeding max_targets to disclose sensitive information.
The out-of-bounds data is embedded in Implicit Logout and PLOGI MADs sent back to the VIO server.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89
- https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161
- https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f
- https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983
- https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc
- https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db
- https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780
- https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3