CVE-2026-64183efi: Allocate runtime workqueue before ACPI init
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: efi: Allocate runtime workqueue before ACPI init Since commit 5894cf571e14 ("acpi/prmt: Use EFI runtime sandbox to invoke PRM handlers") ACPI PRM calls are delegated to a workqueue which runs in a kernel thread, making it easier to detect and mitigate faulting memory accesses performed by the firmware. Rafael reports that such PRM accesses may occur before efisubsys_init() executes, which is where the workqueue is allocated, leading to NULL pointer dereferences. Since acpi_init() [which triggers the early PRM accesses] executes as a subsys_initcall() as well, and has its own dependencies that may be sensitive to initcall ordering, deferring acpi_init() is not an option. So instead, split off the workqueue allocation into its own postcore initcall, as this is the only missing piece to allow EFI runtime calls to be made. This ensures that EFI runtime call (including PRM calls) are accessible to all code running at subsys_initcall() level.
Timeline
ID reserved
By Linux
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 5894cf571e14fb393a4d0a82538de032127b9d8b – < 29cd94e678fcb3c4fd0f359deeac6d61334323fc
- affected 5894cf571e14fb393a4d0a82538de032127b9d8b – < 6996e954ae830f5b793ba6cf449885ca519dbdd2
- affected 5894cf571e14fb393a4d0a82538de032127b9d8b – < c32a1fbe0f9a48453a552bb315cc4f1e7a74084e
- affected 5894cf571e14fb393a4d0a82538de032127b9d8b – < e871549f7894ad4114b3dd53f241aa25a268ba8b
- affected 5894cf571e14fb393a4d0a82538de032127b9d8b – < 13c6da02e767152c9ac4330962247a5e47011035
- affected 6.6
- unaffected < 6.6
- unaffected 6.6.142 – ≤ 6.6.*
- unaffected 6.12.92 – ≤ 6.12.*
- unaffected 6.18.34 – ≤ 6.18.*
- unaffected 7.0.11 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References5
- https://git.kernel.org/stable/c/29cd94e678fcb3c4fd0f359deeac6d61334323fc (opens in a new tab)
- https://git.kernel.org/stable/c/6996e954ae830f5b793ba6cf449885ca519dbdd2 (opens in a new tab)
- https://git.kernel.org/stable/c/c32a1fbe0f9a48453a552bb315cc4f1e7a74084e (opens in a new tab)
- https://git.kernel.org/stable/c/e871549f7894ad4114b3dd53f241aa25a268ba8b (opens in a new tab)
- https://git.kernel.org/stable/c/13c6da02e767152c9ac4330962247a5e47011035 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-45868 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64183)Record last updated .