Free of Memory not on the Heap in Linux kernel - CVE-2026-89920
Published: September 17, 2026
Vulnerability identifier: #VU150359
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89920
CWE-ID: CWE-590
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to improper freeing of stack memory in KVM s390 machine check reinjection when reinjecting channel-subsystem damage machine checks. A local user can trigger machine check reinjection to cause memory corruption.
Affected software
Linux kernel
How to mitigate CVE-2026-89920
Install security update from vendor's repository.