vfio/pci: Latch disable_idle_d3 per device

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Summary

CVECVE-2026-64476
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:33 UTC
Updated2026-07-25 10:17:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: vfio/pci: Latch disable_idle_d3 per device When disable_idle_d3 was introduced in vfio-pci, it directly manipulated the device power state with pci_set_power_state(). There were no refcounts to maintain or balanced operations, we could unconditionally bring the device to D0 and conditionally move it to D3hot. Therefore the module parameter was made writable. Later, in commit c61302aa48f7 ("vfio/pci: Move module parameters to vfio_pci.c"), as part of the vfio-pci-core split, the writable aspect of the module parameter was nullified. The parameter value could still be changed through sysfs, but the vfio-pci driver latched the values into vfio-pci-core globals at module init. Loading the vfio-pci module, or unloading and reloading, with non-default or different values could change the globals relative to existing devices bound to vfio-pci variant drivers. Runtime PM was introduced in commit 7ab5e10eda02 ("vfio/pci: Move the unused device into low power state with runtime PM"), which marks the point where power states became refcounted. PM get and put operations need to be balanced, but the same module operations noted above can change the global variables relative to those devices already bound to vfio-pci variant drivers. This introduces a window where PM operations can now become unbalanced. To resolve this with a narrow footprint for stable backports, the disable_idle_d3 flag is latched into the vfio_pci_core_device at the time of initialization, such that the device always operates with a consistent value. NB. vfio_pci_dev_set_try_reset() now unconditionally raises the runtime PM usage count around bus reset to account for disable_idle_d3 becoming a per-device rather than global flag. When this flag is set, the additional get/put pair is harmless and allows continued use of the shared vfio_pci_dev_set_pm_runtime_get() helper.

Risk And Classification

EPSS: 0.001800000 probability, percentile 0.079220000 (date 2026-07-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7ab5e10eda02da1d9562ffde562c51055d368e9c 332d785f9ae426eeeb92527872adf09d84101ba3 git Not specified
CNA Linux Linux affected 7ab5e10eda02da1d9562ffde562c51055d368e9c 654710ef3135c4546b20a903bc23a51b0c44d6c8 git Not specified
CNA Linux Linux affected 7ab5e10eda02da1d9562ffde562c51055d368e9c b98296816d31441b307ef9fa8670dcf5a55e5505 git Not specified
CNA Linux Linux affected 7ab5e10eda02da1d9562ffde562c51055d368e9c f6c67cf0051f96ba61d186731d3d9409b9927db2 git Not specified
CNA Linux Linux affected 7ab5e10eda02da1d9562ffde562c51055d368e9c 062b820290bcb9778e43a73597df76e9bb08acfb git Not specified
CNA Linux Linux affected 7ab5e10eda02da1d9562ffde562c51055d368e9c 4575e9aac5336d1365138c0284773bf8da4b1fa3 git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/332d785f9ae426eeeb92527872adf09d84101ba3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f6c67cf0051f96ba61d186731d3d9409b9927db2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4575e9aac5336d1365138c0284773bf8da4b1fa3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/654710ef3135c4546b20a903bc23a51b0c44d6c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/062b820290bcb9778e43a73597df76e9bb08acfb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b98296816d31441b307ef9fa8670dcf5a55e5505 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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