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VulnerabilityPublished Updated

CVE-2026-64183: Linux kernel · efi: Allocate runtime workqueue before ACPI init

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e871549f7894ad4114b3dd53f241aa25a268ba8b : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:03 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in e871549f7894ad4114b3dd53f241aa25a268ba8b, c32a1fbe0f9a48453a552bb315cc4f1e7a74084e, 6996e954ae830f5b793ba6cf449885ca519dbdd2 +2

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 5894cf571e14fb393a4d0a82538de032127b9d8b, < e871549f7894ad4114b3dd53f241aa25a268ba8b
Fixed in
  • e871549f7894ad4114b3dd53f241aa25a268ba8b
LinuxLinuxAffected
  • ≥ 5894cf571e14fb393a4d0a82538de032127b9d8b, < c32a1fbe0f9a48453a552bb315cc4f1e7a74084e
Fixed in
  • c32a1fbe0f9a48453a552bb315cc4f1e7a74084e
LinuxLinuxAffected
  • ≥ 5894cf571e14fb393a4d0a82538de032127b9d8b, < 6996e954ae830f5b793ba6cf449885ca519dbdd2
Fixed in
  • 6996e954ae830f5b793ba6cf449885ca519dbdd2
LinuxLinuxAffected
  • ≥ 5894cf571e14fb393a4d0a82538de032127b9d8b, < 29cd94e678fcb3c4fd0f359deeac6d61334323fc
Fixed in
  • 29cd94e678fcb3c4fd0f359deeac6d61334323fc
LinuxLinuxAffected
  • ≥ 5894cf571e14fb393a4d0a82538de032127b9d8b, < 13c6da02e767152c9ac4330962247a5e47011035
Fixed in
  • 13c6da02e767152c9ac4330962247a5e47011035
LinuxLinuxAffected
  • =6.6
Fixed in–

AI-suggested

This vulnerability has been fixed in the Linux kernel by allocating the EFI runtime workqueue earlier in the initialization process. Users should update to a Linux kernel version that includes the fix (commits e871549f7894ad4114b3dd53f241aa25a268ba8b and others). No additional mitigation steps are required.

Description

A vulnerability in the Linux kernel related to EFI runtime workqueue allocation before ACPI initialization has been resolved. The issue involved NULL pointer dereferences caused by early PRM accesses occurring before the workqueue was allocated. The fix involved allocating the runtime workqueue earlier in the initialization sequence to ensure EFI runtime calls are accessible during ACPI initialization.

References

Community reviews

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