{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74613","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.920Z","datePublished":"2026-08-22T15:31:59.062Z","dateUpdated":"2026-08-25T05:40:39.724Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-25T05:40:39.724Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: avoid refilling the RX queue after teardown\n\nCommit b917507e5ad9 (\"vsock/virtio: stop workers during the .remove()\")\nmade the RX worker jump to its common exit when rx_run is clear.  That\nexit still refills the RX queue when the buffer count is low, so work\nqueued across virtio_vsock_vqs_del() can add buffers after the virtqueues\nhave been deleted.\n\nBUG: KASAN: slab-use-after-free in virtqueue_add_sgs\nRead of size 4 by task kworker/0:1\nWorkqueue: virtio_vsock virtio_transport_rx_work\nCall Trace:\n virtqueue_add_sgs (drivers/virtio/virtio_ring.c:2796)\n virtio_vsock_rx_fill (net/vmw_vsock/virtio_transport.c:332)\n virtio_transport_rx_work (net/vmw_vsock/virtio_transport.c:701)\n process_one_work (kernel/workqueue.c:3314)\n worker_thread (kernel/workqueue.c:3478)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:158)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n...\nFreed by task 141:\n kfree (mm/slub.c:6566)\n vp_del_vq (drivers/virtio/virtio_pci_common.c:259)\n vp_del_vqs (drivers/virtio/virtio_pci_common.c:285)\n virtio_vsock_freeze (net/vmw_vsock/virtio_transport.c:912)\n virtio_device_freeze (drivers/virtio/virtio.c:658)\n virtio_pci_freeze (drivers/virtio/virtio_pci_common.c:601)\n pci_pm_freeze (drivers/pci/pci-driver.c:1098)\n device_suspend (drivers/base/power/main.c:1968)\nKernel panic - not syncing: KASAN: panic_on_warn set ...\n\nJump to a no-refill exit when rx_run is clear, leaving the normal exit\nto replenish a running queue."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is in the virtio-vsock guest driver reached via AF_VSOCK sockets and virtio virtqueue callbacks, not via remote network packets; kernel guidance classifies vsock as Local attack vector.\nAC:L - An attacker can reliably queue virtio_transport_rx_work by maintaining active vsock traffic while virtqueues are torn down; this slab UAF race is attacker-influenced and does not depend on uncontrollable memory layout.\nPR:L - Triggering the vulnerable RX refill path requires only normal unprivileged AF_VSOCK use to drive virtio RX work; teardown can coincide with host-driven suspend, migration, or device removal without guest root.\nUI:N - Exploitation requires no victim interaction beyond the attacker opening and using vsock sockets to generate virtio RX work during device teardown.\nS:U - The use-after-free corrupts guest-kernel virtio state and can panic the guest kernel; it does not directly cross a VM/host security boundary or enable guest-to-host escape.\nC:H - KASAN reports a slab use-after-free read in virtqueue_add_sgs on freed virtqueue metadata; UAF of kernel heap objects can be leveraged for arbitrary kernel memory disclosure.\nI:H - Use-after-free of virtqueue structures during virtio_vsock_rx_fill enables heap corruption and can be developed into arbitrary kernel writes or control-flow hijack, not merely a benign read.\nA:H - The reported reproducer triggers KASAN slab-use-after-free and kernel panic during virtio_vsock freeze/teardown; UAF in kernel workqueue context causes high availability impact."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/virtio_transport.c"],"versions":[{"version":"b917507e5ad983085d29069369778b16aa03a0a8","lessThan":"a7658508f5fe8f1077a65e8cb9535d3426f37a2f","status":"affected","versionType":"git"},{"version":"b917507e5ad983085d29069369778b16aa03a0a8","lessThan":"1aa21e7c8702a7c37cd7d3cace1a652cfa5e8171","status":"affected","versionType":"git"},{"version":"b917507e5ad983085d29069369778b16aa03a0a8","lessThan":"4d37e3525cc346a1421c1bdeaad5848e249fc60c","status":"affected","versionType":"git"},{"version":"b917507e5ad983085d29069369778b16aa03a0a8","lessThan":"9d80a04129a6c27a690cb69de3fe3f50be5aa8b9","status":"affected","versionType":"git"},{"version":"b917507e5ad983085d29069369778b16aa03a0a8","lessThan":"a309b74e3fc052352ab778500449cb9c3853c363","status":"affected","versionType":"git"},{"version":"b917507e5ad983085d29069369778b16aa03a0a8","lessThan":"38c7763fdc533edb34dc8f4489c260e8ba2ccae9","status":"affected","versionType":"git"},{"version":"b917507e5ad983085d29069369778b16aa03a0a8","lessThan":"e82a5faea2e3886dfb2a65ce092a132e7e896915","status":"affected","versionType":"git"},{"version":"b917507e5ad983085d29069369778b16aa03a0a8","lessThan":"a31e0ad444698d8aa7534a0f89fda543730f97a5","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/virtio_transport.c"],"versions":[{"version":"5.3","status":"affected"},{"version":"0","lessThan":"5.3","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.152","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.104","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.45","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.9","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a7658508f5fe8f1077a65e8cb9535d3426f37a2f"},{"url":"https://git.kernel.org/stable/c/1aa21e7c8702a7c37cd7d3cace1a652cfa5e8171"},{"url":"https://git.kernel.org/stable/c/4d37e3525cc346a1421c1bdeaad5848e249fc60c"},{"url":"https://git.kernel.org/stable/c/9d80a04129a6c27a690cb69de3fe3f50be5aa8b9"},{"url":"https://git.kernel.org/stable/c/a309b74e3fc052352ab778500449cb9c3853c363"},{"url":"https://git.kernel.org/stable/c/38c7763fdc533edb34dc8f4489c260e8ba2ccae9"},{"url":"https://git.kernel.org/stable/c/e82a5faea2e3886dfb2a65ce092a132e7e896915"},{"url":"https://git.kernel.org/stable/c/a31e0ad444698d8aa7534a0f89fda543730f97a5"}],"title":"vsock/virtio: avoid refilling the RX queue after teardown","x_generator":{"engine":"bippy-1.2.0"}}}}