SB20260918360 - Configuration in Linux kernel arm
Published: September 18, 2026
Security Bulletin ID
SB20260918360
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) Configuration (CVE-ID: CVE-2026-90305)
CWE-ID: CWE-16 - Configuration
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper configuration in ARM CPU timer task-work configuration when CPU timers expire in hard interrupt context on PREEMPT_RT systems. A local user can configure a CPU resource limit and execute a busy loop to cause a denial of service.
CPU timers can also be triggered through ITIMER_PROF, ITIMER_VIRTUAL, and POSIX timers created with timer_create().
Remediation
Install update from vendor's website.