CVE-2026-64183

System crash via premature EFI runtime dispatch

Published Jul 19, 2026 · Updated Jul 19, 2026

NULL pointer dereference in the Linux Kernel EFI runtime path allows local users to crash the system during ACPI initialization. EFI runtime dispatch queues an ACPI PRM call before efisubsys_init() has allocated the worker queue, causing a NULL workqueue pointer dereference. The condition requires firmware that issues an early PRM access; the reported consequence is system instability or a crash, with no confidentiality or integrity impact.

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

NULL pointer dereference in the Linux Kernel EFI runtime path allows local users to crash the system during ACPI initialization. EFI runtime dispatch queues an ACPI PRM call before efisubsys_init() has allocated the worker queue, causing a NULL workqueue pointer dereference. The condition requires firmware that issues an early PRM access; the reported consequence is system instability or a crash, with no confidentiality or integrity impact.

The record

CVE
CVE-2026-64183
Published
Jul 19, 2026
Updated
Jul 19, 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 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=5894cf571e14fb393a4d0a82538de032127b9d8b <13c6da02e767152c9ac4330962247a5e47011035
  2. Affected versionversion=5894cf571e14fb393a4d0a82538de032127b9d8b <29cd94e678fcb3c4fd0f359deeac6d61334323fc
  3. Affected versionversion=5894cf571e14fb393a4d0a82538de032127b9d8b <6996e954ae830f5b793ba6cf449885ca519dbdd2
  4. Affected versionversion=5894cf571e14fb393a4d0a82538de032127b9d8b <c32a1fbe0f9a48453a552bb315cc4f1e7a74084e
  5. Affected versionversion=5894cf571e14fb393a4d0a82538de032127b9d8b <e871549f7894ad4114b3dd53f241aa25a268ba8b
  6. Affected versionversion=6.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5894cf571e14fb393a4d0a82538de032127b9d8b <13c6da02e767152c9ac4330962247a5e47011035; version=5894cf571e14fb393a4d0a82538de032127b9d8b <29cd94e678fcb3c4fd0f359deeac6d61334323fc; version=5894cf571e14fb393a4d0a82538de032127b9d8b <6996e954ae830f5b793ba6cf449885ca519dbdd2; version=5894cf571e14fb393a4d0a82538de032127b9d8b <c32a1fbe0f9a48453a552bb315cc4f1e7a74084e; version=5894cf571e14fb393a4d0a82538de032127b9d8b <e871549f7894ad4114b3dd53f241aa25a268ba8b; version=6.6

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.

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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)
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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