CVE-2026-64214

Host crash via real-mode preemption counter access

Published Jul 24, 2026 · Updated Jul 24, 2026

Denial of service in the powerpc time code in Linux Kernel allows local users to trigger a kernel panic during a real-mode machine check. The redundant preempt_disable() call in arch_irq_work_raise() accesses preempt_count from a real-mode MCE handler, where that access can fault. An affected powerpc system and a machine-check exception are required, and the reported consequence is a host crash without data access or modification.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the powerpc time code in Linux Kernel allows local users to trigger a kernel panic during a real-mode machine check. The redundant preempt_disable() call in arch_irq_work_raise() accesses preempt_count from a real-mode MCE handler, where that access can fault. An affected powerpc system and a machine-check exception are required, and the reported consequence is a host crash without data access or modification.

The record

CVE
CVE-2026-64214
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=5.18
  2. Affected versionversion=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <31467b23823ffec1f6fff407f8e3ca9af8b7491a
  3. Affected versionversion=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <51860e423592893cd7bfa7287d99a3aff4dc3a9d
  4. Affected versionversion=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <6dcd072a5ae3aed336e4a67a7d4cc5205b240065
  5. Affected versionversion=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <72d8d1c36452a4d3ee134b1da48de7518c1329f9
  6. Affected versionversion=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <8079acc5ee5235a627e4586d4f42082a9000ea64
  7. Affected versionversion=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <a09d07ac45e283c9861a9ceea06f56d0ba851d22

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.18; version=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <31467b23823ffec1f6fff407f8e3ca9af8b7491a; version=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <51860e423592893cd7bfa7287d99a3aff4dc3a9d; version=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <6dcd072a5ae3aed336e4a67a7d4cc5205b240065; version=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <72d8d1c36452a4d3ee134b1da48de7518c1329f9; version=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <8079acc5ee5235a627e4586d4f42082a9000ea64; version=cc15ff3275694fedc33cd3d53212a43eec7aa0bc <a09d07ac45e283c9861a9ceea06f56d0ba851d22

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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