CVE-2026-64183efi: Allocate runtime workqueue before ACPI init
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Jul 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 5894cf571e14fb393a4d0a82538de032127b9d8b builds before 29cd94e678fcb3c4fd0f359deeac6d61334323fc; from 5894cf571e14fb393a4d0a82538de032127b9d8b before 6996e954ae830f5b793ba6cf449885ca519dbdd2; from 5894cf571e14fb393a4d0a82538de032127b9d8b before c32a1fbe0f9a48453a552bb315cc4f1e7a74084e; from 5894cf571e14fb393a4d0a82538de032127b9d8b before e871549f7894ad4114b3dd53f241aa25a268ba8b; 5894cf571e14fb393a4d0a82538de032127b9d8b builds before 13c6da02e767152c9ac4330962247a5e47011035 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.6 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/29cd94e678fcb3c4fd0f359deeac6d61334323fcpatch
- https://git.kernel.org/stable/c/6996e954ae830f5b793ba6cf449885ca519dbdd2patch
- https://git.kernel.org/stable/c/c32a1fbe0f9a48453a552bb315cc4f1e7a74084epatch
- https://git.kernel.org/stable/c/e871549f7894ad4114b3dd53f241aa25a268ba8bpatch
- https://git.kernel.org/stable/c/13c6da02e767152c9ac4330962247a5e47011035patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.