CVE-2026-80626

CVE CVE-2026-80626EUVD EUVD-2026-67502Published 2026-08-28T06:48:44.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux a11106544f33c104706ae42d27219a409b67478e <c0c7722308c5f303117d8bd555290fdf26b098da; a11106544f33c104706ae42d27219a409b67478e <5397142d60aa29dcf636f5459d960bfc4f97c42a; a11106544f33c104706ae42d27219a409b67478e <b504fd953664c3f4d176ae8cb594adb3fda9d577; a11106544f33c104706ae42d27219a409b67478e <67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28; a11106544f33c104706ae42d27219a409b67478e <73711688479df333acc134e3730fff1acba1843e; patch: 6.18.40; patch: 7.1.5; a11106544f33c104706ae42d27219a409b67478e <9a515e00b00132b6fc3f1dd62dc5204bbda8cb10; 2.6.34; patch: 6.6.145; patch: 7.2; a11106544f33c104706ae42d27219a409b67478e <b89477077c834d94381c7bf07d81193bebefcff9; patch: 6.12.97; patch: 5.10.261; patch: 0; a11106544f33c104706ae42d27219a409b67478e <81e3a86030462824a67d697739cf3f387f4ba350; patch: 6.1.178; patch: 5.15.212

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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