virtio_input: stop callbacks before unregistering input device

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97986
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:26 UTC
Updated2026-09-25 11:17:26 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: virtio_input: stop callbacks before unregistering input device virtinput_remove() unregisters the input device before resetting the virtio device. virtinput_recv_events() drops vi->lock around input_event(), so clearing vi->ready does not stop a callback that passed the entry check. It can still use vi->idev, requeue buffers and kick the queue. Reset first, as virtinput_freeze() already does. With the preceding core change, reset waits for callbacks before input_unregister_device() can free vi->idev. Recheck vi->ready after taking the lock again: keep draining completed events so an input packet is not truncated, but stop requeueing buffers and kicking the queue. With evdev attached, input_unregister_handle() currently waits for an RCU grace period, which also waits out IRQ callbacks. This masks the lifetime bug on PCI and MMIO, but does not protect sleepable callbacks on other transports.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 271c865161c57cfabca45b93eaa712b19da365bc 8226aeee9b9a94cd699fbb51cb230feff46cfaf2 git Not specified
CNA Linux Linux affected 271c865161c57cfabca45b93eaa712b19da365bc a3ba86a270dd87460759214046dc7cbd409ac711 git Not specified
CNA Linux Linux affected 271c865161c57cfabca45b93eaa712b19da365bc 5378f7945856a5ed88e6f9850bc7a68f54090135 git Not specified
CNA Linux Linux affected 271c865161c57cfabca45b93eaa712b19da365bc d7808b37da0a619cf1fa541c2384e783fecc2480 git Not specified
CNA Linux Linux affected 4.1 Not specified
CNA Linux Linux unaffected 4.1 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5378f7945856a5ed88e6f9850bc7a68f54090135 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8226aeee9b9a94cd699fbb51cb230feff46cfaf2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a3ba86a270dd87460759214046dc7cbd409ac711 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d7808b37da0a619cf1fa541c2384e783fecc2480 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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