CVE-2026-74613 (GCVE-0-2026-74613)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
vsock/virtio: avoid refilling the RX queue after teardown
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b917507e5ad983085d29069369778b16aa03a0a8 , < a7658508f5fe8f1077a65e8cb9535d3426f37a2f (git)
Affected: b917507e5ad983085d29069369778b16aa03a0a8 , < 1aa21e7c8702a7c37cd7d3cace1a652cfa5e8171 (git)
Affected: b917507e5ad983085d29069369778b16aa03a0a8 , < 4d37e3525cc346a1421c1bdeaad5848e249fc60c (git)
Affected: b917507e5ad983085d29069369778b16aa03a0a8 , < 9d80a04129a6c27a690cb69de3fe3f50be5aa8b9 (git)
Affected: b917507e5ad983085d29069369778b16aa03a0a8 , < a309b74e3fc052352ab778500449cb9c3853c363 (git)
Affected: b917507e5ad983085d29069369778b16aa03a0a8 , < 38c7763fdc533edb34dc8f4489c260e8ba2ccae9 (git)
Affected: b917507e5ad983085d29069369778b16aa03a0a8 , < e82a5faea2e3886dfb2a65ce092a132e7e896915 (git)
Affected: b917507e5ad983085d29069369778b16aa03a0a8 , < a31e0ad444698d8aa7534a0f89fda543730f97a5 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "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."
        }
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      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "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."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:39.724Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "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",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74613",
    "datePublished": "2026-08-22T15:31:59.062Z",
    "dateReserved": "2026-08-15T05:44:03.920Z",
    "dateUpdated": "2026-08-25T05:40:39.724Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74613",
      "date": "2026-08-29",
      "epss": "0.00126",
      "percentile": "0.02525"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:51:55.000Z",
      "cve": "CVE-2026-74613",
      "id": "msrc_CVE-2026-74613",
      "initial_release_date": "2026-08-24T01:09:12.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vsock/virtio: avoid refilling the RX queue after teardown",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74613.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74613\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:33.890\",\"lastModified\":\"2026-08-25T06:18:38.920\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/vmw_vsock/virtio_transport.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b917507e5ad983085d29069369778b16aa03a0a8\",\"lessThan\":\"a7658508f5fe8f1077a65e8cb9535d3426f37a2f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b917507e5ad983085d29069369778b16aa03a0a8\",\"lessThan\":\"1aa21e7c8702a7c37cd7d3cace1a652cfa5e8171\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b917507e5ad983085d29069369778b16aa03a0a8\",\"lessThan\":\"4d37e3525cc346a1421c1bdeaad5848e249fc60c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b917507e5ad983085d29069369778b16aa03a0a8\",\"lessThan\":\"9d80a04129a6c27a690cb69de3fe3f50be5aa8b9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b917507e5ad983085d29069369778b16aa03a0a8\",\"lessThan\":\"a309b74e3fc052352ab778500449cb9c3853c363\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b917507e5ad983085d29069369778b16aa03a0a8\",\"lessThan\":\"38c7763fdc533edb34dc8f4489c260e8ba2ccae9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b917507e5ad983085d29069369778b16aa03a0a8\",\"lessThan\":\"e82a5faea2e3886dfb2a65ce092a132e7e896915\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b917507e5ad983085d29069369778b16aa03a0a8\",\"lessThan\":\"a31e0ad444698d8aa7534a0f89fda543730f97a5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/vmw_vsock/virtio_transport.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1aa21e7c8702a7c37cd7d3cace1a652cfa5e8171\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/38c7763fdc533edb34dc8f4489c260e8ba2ccae9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4d37e3525cc346a1421c1bdeaad5848e249fc60c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d80a04129a6c27a690cb69de3fe3f50be5aa8b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a309b74e3fc052352ab778500449cb9c3853c363\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a31e0ad444698d8aa7534a0f89fda543730f97a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7658508f5fe8f1077a65e8cb9535d3426f37a2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e82a5faea2e3886dfb2a65ce092a132e7e896915\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:50:59+00:00",
      "cve": "CVE-2026-74613",
      "id": "CVE-2026-74613",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vsock/virtio: avoid refilling the RX queue after teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74613.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.