Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-89549
Published: September 12, 2026
Vulnerability identifier: #VU149254
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89549
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a service connection to hang indefinitely.
The vulnerability exists due to improper handling of threadless service pools in svc_pool_for_cpu() when routing a transport to a service pool. A remote attacker can initiate a connection that is enqueued on a pool with no service threads to cause a service connection to hang indefinitely.
The condition can occur when a service has fewer threads than configured pools.
Affected software
Linux kernel
How to mitigate CVE-2026-89549
Install security update from vendor's repository.