Improper Initialization in Linux kernel - CVE-2026-52980
Published: June 25, 2026
Vulnerability identifier: #VU135400
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-52980
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper initialization in the fair scheduler sched_entity state in __sched_fork() when handling a newly forked task that later calls sched_yield(). A local user can fork a task and trigger sched_yield() to cause a denial of service.
The issue can corrupt cfs_rq->sum_w_vruntime, break EEVDF eligibility calculation, and lead to a later NULL dereference.
How to mitigate CVE-2026-52980
Install security update from vendor's repository.