virtio: rtc: tear down old virtqueues before restore

{
  "id": "7dbb4b73c721ce489781819dffaf93a6e5b7012ff98ac18bfdd7959c2cbfd681",
  "url": "https://osv.dev/vulnerability/CVE-2026-74311",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "virtio: rtc: tear down old virtqueues before restore",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: virtio: rtc: tear down old virtqueues before restore virtio_device_restore() resets the device and restores the negotiated features before calling ->restore(). viortc_freeze() intentionally leaves the existing virtqueues in place so the alarm queue can still wake the system, but viortc_restore() immediately calls viortc_init_vqs() without first deleting those old queues. If virtqueue reinitialization fails on virtio-pci, the transport error path can run vp_del_vqs() against a newly allocated vp_dev->vqs array while vdev->vqs still contains the old virtqueues. vp_del_vqs() then looks up queue state through the new array and can dereference a NULL info pointer in vp_del_vq(), crashing the guest kernel during restore. This can also happen during a non-faulty reinitialization, when one of the vp_find_vqs_msix() attempts is unsuccessful before a later attempt would succeed. Delete the stale virtqueues before rebuilding them. If restore fails before virtio_device_ready(), reuse the remove path to stop the device. Once the device is ready, return errors directly instead of deleting the virtqueues again.",
    "evidence": "osv:CVE-2026-74311",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-74311",
      "aliases": [
        "CVE-2026-74311"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0623c759276885c3ae88197ba6fb5c9c6ba8612f"
                },
                {
                  "fixed": "79366023aa891ca31376021a7bccff6384ca1ff1"
                },
                {
                  "fixed": "aebebd1e9d70b650fc9e877082e0134edcf511da"
                },
                {
                  "fixed": "548d2208455f14e6121404c6e30e997bfe0cd264"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74311.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74311.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.196191854Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/548d2208455f14e6121404c6e30e997bfe0cd264",
        "https://git.kernel.org/stable/c/79366023aa891ca31376021a7bccff6384ca1ff1",
        "https://git.kernel.org/stable/c/aebebd1e9d70b650fc9e877082e0134edcf511da",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74311.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74311",
        "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/2026/74xxx/CVE-2026-74311.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74311",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514372,
  "published_at": "2026-08-15T05:58:10.711+00:00"
}