Answer in brief
CVE-2025-21965 records a High severity (CVSS 7.8) vulnerability in sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f0e1a0643a59bf1f922fa209cec86a170b784f3f <752b56bb76e2471197d25d6948d85753043b10da || >=f0e1a0643a59bf1f922fa209cec86a170b784f3f <515680e76c536dd4aa8e2b5d674b0d441baddf5b || >=f0e1a0643a59bf1f922fa209cec86a170b784f3f <9360dfe4cbd62ff1eb8217b815964931523b75b3 | 752b56bb76e2471197d25d6948d85753043b10da, 515680e76c536dd4aa8e2b5d674b0d441baddf5b, 9360dfe4cbd62ff1eb8217b815964931523b75b3 |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
Apr 1, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.