vsock/virtio: flush works in dependency order

{
  "id": "852fed49f7b22f24ba914841201ce16977bad53478e50648ff9478cbe21cce01",
  "url": "https://osv.dev/vulnerability/CVE-2026-80932",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vsock/virtio: flush works in dependency order",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: flush works in dependency order virtio_vsock_remove() stops the virtqueues and then flushes each work item before freeing the enclosing virtio_vsock. The current order does not account for dependencies between those items: tx_work may queue send_pkt_work, and send_pkt_work may queue rx_work. In particular, send_pkt_work can set restart_rx and release tx_lock. The remove path can then stop the queues and flush rx_work before send_pkt_work queues it. Although the later send_pkt_work flush waits for that producer to finish, nothing waits for the newly queued rx_work, so kfree(vsock) can race with it. KASAN reported: BUG: KASAN: slab-use-after-free in virtio_transport_rx_work+0x487/0x4b0 Read of size 8 at addr ffff888114c2b008 by task kworker/1:1/47 Workqueue: virtio_vsock virtio_transport_rx_work Call Trace: virtio_transport_rx_work+0x487/0x4b0 process_one_work+0x688/0x1120 worker_thread+0x45b/0xd10 Allocated by task 1: virtio_vsock_probe+0xef/0x6b0 Freed by task 84: kfree+0x131/0x3c0 virtio_vsock_remove+0xd1/0x100 Flush the works in producer-to-consumer order. virtio_vsock_vqs_del() has already disabled the queue callbacks and cleared the run flags, so after tx_work and send_pkt_work are drained, no source remains that can queue rx_work after its flush.",
    "evidence": "osv:CVE-2026-80932",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-80932",
      "aliases": [
        "CVE-2026-80932"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
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      ],
      "modified": "2026-10-28T02:30:49.589636357Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/165a330a68b5f299d8735f0194c314cb2e571269",
        "https://git.kernel.org/stable/c/2187a56f2fd1715d54daed6392809223c60544f3",
        "https://git.kernel.org/stable/c/531e2ac2dab1ab90a16427c4f9c86663633e9487",
        "https://git.kernel.org/stable/c/728836ebca239810f164262b10211ef59182f811",
        "https://git.kernel.org/stable/c/b9cb4e8ba71c9fbd935d66baa71bbb0b87192c94",
        "https://git.kernel.org/stable/c/da5e9f08714c19ba04e6863aca69d40f042f2e04",
        "https://git.kernel.org/stable/c/e059a14c1067bcc4f7b1947cd09f2baab98e340f",
        "https://git.kernel.org/stable/c/f3313d952fc380cff53db9a28451a8807aa67b43",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80932.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80932",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80932.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80932",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518074,
  "published_at": "2026-09-11T19:42:07.012+00:00"
}