virtio: rtc: tear down old virtqueues before restore

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Summary

CVECVE-2026-74311
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:31 UTC
Updated2026-08-15 06:22:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: virtio: rtc: tear down old virtqueues before restore virtio_device_restore() resets the device and restores the negotiated features before calling ->restore(). viortc_freeze() intentionally leaves the existing virtqueues in place so the alarm queue can still wake the system, but viortc_restore() immediately calls viortc_init_vqs() without first deleting those old queues. If virtqueue reinitialization fails on virtio-pci, the transport error path can run vp_del_vqs() against a newly allocated vp_dev->vqs array while vdev->vqs still contains the old virtqueues. vp_del_vqs() then looks up queue state through the new array and can dereference a NULL info pointer in vp_del_vq(), crashing the guest kernel during restore. This can also happen during a non-faulty reinitialization, when one of the vp_find_vqs_msix() attempts is unsuccessful before a later attempt would succeed. Delete the stale virtqueues before rebuilding them. If restore fails before virtio_device_ready(), reuse the remove path to stop the device. Once the device is ready, return errors directly instead of deleting the virtqueues again.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.062570000 (date 2026-08-15)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0623c759276885c3ae88197ba6fb5c9c6ba8612f 79366023aa891ca31376021a7bccff6384ca1ff1 git Not specified
CNA Linux Linux affected 0623c759276885c3ae88197ba6fb5c9c6ba8612f aebebd1e9d70b650fc9e877082e0134edcf511da git Not specified
CNA Linux Linux affected 0623c759276885c3ae88197ba6fb5c9c6ba8612f 548d2208455f14e6121404c6e30e997bfe0cd264 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/548d2208455f14e6121404c6e30e997bfe0cd264 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aebebd1e9d70b650fc9e877082e0134edcf511da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/79366023aa891ca31376021a7bccff6384ca1ff1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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