virtio: rtc: time out alarm requests

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Summary

CVECVE-2026-90127
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:05 UTC
Updated2026-09-17 17:17:05 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: virtio: rtc: time out alarm requests RTC class operations run with rtc_device.ops_lock held. The virtio RTC alarm requests currently wait without a timeout for the device to return their requestq buffers. On surprise removal, virtio-pci marks the virtqueues broken before unregistering the virtio device. If an alarm request is waiting when the device stops responding, viortc_remove() blocks in viortc_class_stop() while trying to acquire ops_lock. The request cannot complete and device removal hangs until the waiting task is signalled. Use the same 60-second timeout as clock read requests for alarm reads, alarm programming, and alarm interrupt enable requests. The existing message reference counting keeps a timed-out request alive until a late response or device teardown.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9d4f22fd563e0cd02e8448e84d057e7c0132a586 28701b74c22d2a43ddf7aebb6378e60c18323865 git Not specified
CNA Linux Linux affected 9d4f22fd563e0cd02e8448e84d057e7c0132a586 afbf69d1d691c06d093d7c3f17168ecb608c4977 git Not specified
CNA Linux Linux affected 9d4f22fd563e0cd02e8448e84d057e7c0132a586 68e00d9212929805b40dcb9166755610f4f4acee git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/68e00d9212929805b40dcb9166755610f4f4acee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/afbf69d1d691c06d093d7c3f17168ecb608c4977 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/28701b74c22d2a43ddf7aebb6378e60c18323865 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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