efi: Allocate runtime workqueue before ACPI init

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Summary

CVECVE-2026-64183
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:18:00 UTC
Updated2026-07-19 16:18:00 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5894cf571e14fb393a4d0a82538de032127b9d8b 29cd94e678fcb3c4fd0f359deeac6d61334323fc git Not specified
CNA Linux Linux affected 5894cf571e14fb393a4d0a82538de032127b9d8b 6996e954ae830f5b793ba6cf449885ca519dbdd2 git Not specified
CNA Linux Linux affected 5894cf571e14fb393a4d0a82538de032127b9d8b c32a1fbe0f9a48453a552bb315cc4f1e7a74084e git Not specified
CNA Linux Linux affected 5894cf571e14fb393a4d0a82538de032127b9d8b e871549f7894ad4114b3dd53f241aa25a268ba8b git Not specified
CNA Linux Linux affected 5894cf571e14fb393a4d0a82538de032127b9d8b 13c6da02e767152c9ac4330962247a5e47011035 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6996e954ae830f5b793ba6cf449885ca519dbdd2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c32a1fbe0f9a48453a552bb315cc4f1e7a74084e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/29cd94e678fcb3c4fd0f359deeac6d61334323fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e871549f7894ad4114b3dd53f241aa25a268ba8b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/13c6da02e767152c9ac4330962247a5e47011035 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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