CVE-2026-80626

Kernel BUG via unmatched preemption enable

Published Aug 28, 2026 · Updated Aug 28, 2026

Preemption-state corruption in Linux kernel powerpc perf event deletion allows attackers to trigger a scheduling-while-atomic kernel BUG. When fsl_emb_pmu_del sees a negative event index, it jumps past get_cpu_var but still calls put_cpu_var, issuing an unmatched preempt_enable and underflowing preempt_count. Reachability requires a PowerPC system with the affected perf path and CONFIG_PREEMPT enabled; public sources do not establish an attacker privilege level or reliable system crash.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Preemption-state corruption in Linux kernel powerpc perf event deletion allows attackers to trigger a scheduling-while-atomic kernel BUG. When fsl_emb_pmu_del sees a negative event index, it jumps past get_cpu_var but still calls put_cpu_var, issuing an unmatched preempt_enable and underflowing preempt_count. Reachability requires a PowerPC system with the affected perf path and CONFIG_PREEMPT enabled; public sources do not establish an attacker privilege level or reliable system crash.

The record

CVE
CVE-2026-80626
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.34
  2. Affected versionversion=a11106544f33c104706ae42d27219a409b67478e <5397142d60aa29dcf636f5459d960bfc4f97c42a
  3. Affected versionversion=a11106544f33c104706ae42d27219a409b67478e <67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28
  4. Affected versionversion=a11106544f33c104706ae42d27219a409b67478e <73711688479df333acc134e3730fff1acba1843e
  5. Affected versionversion=a11106544f33c104706ae42d27219a409b67478e <81e3a86030462824a67d697739cf3f387f4ba350
  6. Affected versionversion=a11106544f33c104706ae42d27219a409b67478e <9a515e00b00132b6fc3f1dd62dc5204bbda8cb10
  7. Affected versionversion=a11106544f33c104706ae42d27219a409b67478e <b504fd953664c3f4d176ae8cb594adb3fda9d577
  8. Affected versionversion=a11106544f33c104706ae42d27219a409b67478e <b89477077c834d94381c7bf07d81193bebefcff9
  9. Affected versionversion=a11106544f33c104706ae42d27219a409b67478e <c0c7722308c5f303117d8bd555290fdf26b098da

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=a11106544f33c104706ae42d27219a409b67478e <5397142d60aa29dcf636f5459d960bfc4f97c42a; version=a11106544f33c104706ae42d27219a409b67478e <67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28; version=a11106544f33c104706ae42d27219a409b67478e <73711688479df333acc134e3730fff1acba1843e; version=a11106544f33c104706ae42d27219a409b67478e <81e3a86030462824a67d697739cf3f387f4ba350; version=a11106544f33c104706ae42d27219a409b67478e <9a515e00b00132b6fc3f1dd62dc5204bbda8cb10; version=a11106544f33c104706ae42d27219a409b67478e <b504fd953664c3f4d176ae8cb594adb3fda9d577; version=a11106544f33c104706ae42d27219a409b67478e <b89477077c834d94381c7bf07d81193bebefcff9; version=a11106544f33c104706ae42d27219a409b67478e <c0c7722308c5f303117d8bd555290fdf26b098da

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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