CVE-2026-74613

Summary

In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: avoid refilling the RX queue after teardown

Commit b917507e5ad9 ("vsock/virtio: stop workers during the .remove()") made the RX worker jump to its common exit when rx_run is clear. That exit still refills the RX queue when the buffer count is low, so work queued across virtio_vsock_vqs_del() can add buffers after the virtqueues have been deleted.

BUG: KASAN: slab-use-after-free in virtqueue_add_sgs Read of size 4 by task kworker/0:1 Workqueue: virtio_vsock virtio_transport_rx_work Call Trace: virtqueue_add_sgs (drivers/virtio/virtio_ring.c:2796) virtio_vsock_rx_fill (net/vmw_vsock/virtio_transport.c:332) virtio_transport_rx_work (net/vmw_vsock/virtio_transport.c:701) process_one_work (kernel/workqueue.c:3314) worker_thread (kernel/workqueue.c:3478) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) … Freed by task 141: kfree (mm/slub.c:6566) vp_del_vq (drivers/virtio/virtio_pci_common.c:259) vp_del_vqs (drivers/virtio/virtio_pci_common.c:285) virtio_vsock_freeze (net/vmw_vsock/virtio_transport.c:912) virtio_device_freeze (drivers/virtio/virtio.c:658) virtio_pci_freeze (drivers/virtio/virtio_pci_common.c:601) pci_pm_freeze (drivers/pci/pci-driver.c:1098) device_suspend (drivers/base/power/main.c:1968) Kernel panic - not syncing: KASAN: panic_on_warn set …

Jump to a no-refill exit when rx_run is clear, leaving the normal exit to replenish a running queue.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a7658508f5fe8f1077a65e8cb9535d3426f37a2f
• https://git.kernel.org/stable/c/1aa21e7c8702a7c37cd7d3cace1a652cfa5e8171
• https://git.kernel.org/stable/c/4d37e3525cc346a1421c1bdeaad5848e249fc60c
• https://git.kernel.org/stable/c/9d80a04129a6c27a690cb69de3fe3f50be5aa8b9
• https://git.kernel.org/stable/c/a309b74e3fc052352ab778500449cb9c3853c363
• https://git.kernel.org/stable/c/38c7763fdc533edb34dc8f4489c260e8ba2ccae9
• https://git.kernel.org/stable/c/e82a5faea2e3886dfb2a65ce092a132e7e896915
• https://git.kernel.org/stable/c/a31e0ad444698d8aa7534a0f89fda543730f97a5

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