SB20260918117 - Use-after-free in Linux kernel restore_dm_crypt_keys_to_thread_keyring() in kernel/crash_dump_dm_crypt.c
Published: September 18, 2026
Security Bulletin ID
SB20260918117
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-93106)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a use-after-free condition.
The vulnerability exists due to improper reference counting in restore_dm_crypt_keys_to_thread_keyring() when restoring more than five saved dm-crypt keys. A local user can cause multiple saved dm-crypt keys to be restored during crash dump processing to cause a use-after-free condition.
Remediation
Install update from vendor's website.