CVE-2026-64183: Linux kernel · efi: Allocate runtime workqueue before ACPI init
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e871549f7894ad4114b3dd53f241aa25a268ba8b : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:03 UTC
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
Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| 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
- git.kernel.org/stable/c/29cd94e678fcb3c4fd0f359deeac6d61334323fc (opens in a new tab)
- git.kernel.org/stable/c/6996e954ae830f5b793ba6cf449885ca519dbdd2 (opens in a new tab)
- git.kernel.org/stable/c/c32a1fbe0f9a48453a552bb315cc4f1e7a74084e (opens in a new tab)
- git.kernel.org/stable/c/e871549f7894ad4114b3dd53f241aa25a268ba8b (opens in a new tab)
- git.kernel.org/stable/c/13c6da02e767152c9ac4330962247a5e47011035 (opens in a new tab)