SB2026091924 - Memory leak in Linux kernel block null_blk driver
Published: September 19, 2026
Security Bulletin ID
SB2026091924
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) Memory leak (CVE-ID: CVE-2026-90187)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
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 denial of service.
The vulnerability exists due to missing release of memory in the null_blk zoned device zones array when repeatedly powering a zoned device off and on. A local user can repeatedly power a zoned device off and on to cause a denial of service.
Remediation
Install update from vendor's website.