Use of Uninitialized Variable in Linux kernel - CVE-2026-98938
Published: October 23, 2026
Vulnerability identifier: #VU157575
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98938
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially cause a denial of service through a kernel crash.
The vulnerability exists due to use of uninitialized memory in the Linux kernel Rust IRQ registration code when an interrupt callback runs before registration.inner has been initialized. A local user can trigger an interrupt during this initialization window to potentially cause a kernel crash and denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-98938
Install security update from vendor's repository.