SB2026102391 - Out-of-bounds read in Linux kernel md driver

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Main Vulnerability Database SB2026102391

SB2026102391 - Out-of-bounds read in Linux kernel md driver

Published: October 23, 2026

Security Bulletin ID SB2026102391
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-99063)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to disclose seven bytes of kernel memory beyond an allocated buffer.

The vulnerability exists due to an out-of-bounds read in the Linux kernel device-mapper ioctl implementation when get_result_buffer() sets data_start beyond the end of a minimum-sized buffer. A local privileged user can issue a DM_LIST_DEVICES ioctl with data_size set to 305 to cause ctl_ioctl() to copy seven bytes beyond the allocation back to userspace.


Remediation

Install update from vendor's website.

References