SB2026091905 - Memory leak in Linux kernel mtd ubi driver
Published: September 19, 2026
Security Bulletin ID
SB2026091905
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-2026-90215)
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 prevent a device object from being released.
The vulnerability exists due to improper device reference management in ubi_detach_mtd_dev() when attempting to detach a busy UBI device. A local user can attempt to detach a busy UBI device to prevent a device object from being released.
Remediation
Install update from vendor's website.