SB20261023129 - Use-after-free in Linux kernel md driver
Published: October 23, 2026
Security Bulletin ID
SB20261023129
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-99036)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to potentially cause a denial of service through a kernel crash.
The vulnerability exists due to a use-after-free in the Linux kernel device-mapper do_resume() function when processing concurrent ioctls on the same device. A local privileged user can race a table swap against an unlocked dm_table_get_mode(new_map) call to trigger a read of freed table memory, potentially causing a kernel crash.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c
- https://git.kernel.org/stable/c/2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82
- https://git.kernel.org/stable/c/301691c32b8ad023e3316d5dbb6a8cf52d47b0dc
- https://git.kernel.org/stable/c/c9417c1c5269e2bd0570fbe53e4ec03a8d31f008
- https://git.kernel.org/stable/c/e3bf232c913b7e0103d323f15e6342d37cb1b357