Bug 2521402 (CVE-2026-74614) - CVE-2026-74614 kernel: vsock/virtio: read virtqueues under worker locks
Summary: CVE-2026-74614 kernel: vsock/virtio: read virtqueues under worker locks
Keywords:
Status: NEW
Alias: CVE-2026-74614
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-22 15:43 UTC by OSIDB Bzimport
Modified: 2026-08-24 11:26 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:


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Description OSIDB Bzimport 2026-08-22 15:43:48 UTC
In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: read virtqueues under worker locks

Commit bd50c5dc182b ("vsock/virtio: add support for device
suspend/resume") made the *_run flags transition from false to true when
restore installs replacement virtqueues.  The RX, TX and event workers
read their virtqueue before locking and checking the corresponding flag,
so a worker delayed across freeze and restore can observe the replacement
queue's running state while retaining a pointer to the deleted queue.

Read each virtqueue under its mutex after checking the run flag, keeping
the pointer and state in the same queue generation.

Comment 1 Mauro Matteo Cascella 2026-08-24 11:21:40 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082218-CVE-2026-74614-b5a1@gregkh/T


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