CVE-2025-21965

MediumCVSS 5.5/10Last modified Jul 30, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()

If a BPF scheduler provides an invalid CPU (outside the nr_cpu_ids range) as prev_cpu to scx_bpf_select_cpu_dfl() it can cause a kernel crash.

To prevent this, validate prev_cpu in scx_bpf_select_cpu_dfl() and trigger an scx error if an invalid CPU is specified.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

VendorProductVersions
LinuxLinux>= f0e1a0643a59bf1f922fa209cec86a170b784f3f, < 752b56bb76e2471197d25d6948d85753043b10da; >= f0e1a0643a59bf1f922fa209cec86a170b784f3f, < 515680e76c536dd4aa8e2b5d674b0d441baddf5b; >= f0e1a0643a59bf1f922fa209cec86a170b784f3f, < 9360dfe4cbd62ff1eb8217b815964931523b75b3
LinuxLinux6.12

References

Timeline

Published
Apr 1, 2025
Last modified
Jul 30, 2026
NVD status
Modified

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CVE-2025-21965: Medium severity, CVSS 5.5 | Vulnix