Answer in brief
CVE-2026-80626 records a Unknown severity vulnerability in powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del. 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.
A CVSS score is not reported in the current record. 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 | >=a11106544f33c104706ae42d27219a409b67478e <c0c7722308c5f303117d8bd555290fdf26b098da || >=a11106544f33c104706ae42d27219a409b67478e <67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28 || >=a11106544f33c104706ae42d27219a409b67478e <9a515e00b00132b6fc3f1dd62dc5204bbda8cb10 || >=a11106544f33c104706ae42d27219a409b67478e <5397142d60aa29dcf636f5459d960bfc4f97c42a || >=a11106544f33c104706ae42d27219a409b67478e <b89477077c834d94381c7bf07d81193bebefcff9 || >=a11106544f33c104706ae42d27219a409b67478e <73711688479df333acc134e3730fff1acba1843e || >=a11106544f33c104706ae42d27219a409b67478e <b504fd953664c3f4d176ae8cb594adb3fda9d577 || >=a11106544f33c104706ae42d27219a409b67478e <81e3a86030462824a67d697739cf3f387f4ba350 | c0c7722308c5f303117d8bd555290fdf26b098da, 67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28, 9a515e00b00132b6fc3f1dd62dc5204bbda8cb10, 5397142d60aa29dcf636f5459d960bfc4f97c42a, b89477077c834d94381c7bf07d81193bebefcff9, 73711688479df333acc134e3730fff1acba1843e, b504fd953664c3f4d176ae8cb594adb3fda9d577, 81e3a86030462824a67d697739cf3f387f4ba350 |
| Linux/Linuxgeneric | 2.6.34 | Not reported |
Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 28, 2026
In the Linux kernel, the following vulnerability has been resolved: powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del fsl_emb_pmu_del() unconditionally calls put_cpu_var(cpu_hw_events) at the 'out:' label, but only calls the matching get_cpu_var() after the 'i < 0' early-return check. When event->hw.idx is negative the function jumps to 'out:' without having taken get_cpu_var(), and the trailing put_cpu_var() then issues an unmatched preempt_enable(), underflowing preempt_count. On a CONFIG_PREEMPT=y kernel preempt_count would underflow and eventually present as a 'scheduling while atomic' BUG. Move put_cpu_var() to pair with get_cpu_var() so the percpu access is correctly bracketed and the 'out:' label only handles perf_pmu_enable.
Quoted source text, attributed separately from HOL analysis.