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CVE-2026-74311 (GCVE-0-2026-74311)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:45
VLAI
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.
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: 0623c759276885c3ae88197ba6fb5c9c6ba8612f , < 79366023aa891ca31376021a7bccff6384ca1ff1 (git)
Affected: 0623c759276885c3ae88197ba6fb5c9c6ba8612f , < aebebd1e9d70b650fc9e877082e0134edcf511da (git)
Affected: 0623c759276885c3ae88197ba6fb5c9c6ba8612f , < 548d2208455f14e6121404c6e30e997bfe0cd264 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio: rtc: tear down old virtqueues before restore\n\nvirtio_device_restore() resets the device and restores the negotiated\nfeatures before calling -\u003erestore(). viortc_freeze() intentionally\nleaves the existing virtqueues in place so the alarm queue can still\nwake the system, but viortc_restore() immediately calls\nviortc_init_vqs() without first deleting those old queues.\n\nIf virtqueue reinitialization fails on virtio-pci, the transport error\npath can run vp_del_vqs() against a newly allocated vp_dev-\u003evqs array\nwhile vdev-\u003evqs still contains the old virtqueues. vp_del_vqs() then\nlooks up queue state through the new array and can dereference a NULL\ninfo pointer in vp_del_vq(), crashing the guest kernel during restore.\n\nThis can also happen during a non-faulty reinitialization, when one of\nthe vp_find_vqs_msix() attempts is unsuccessful before a later attempt\nwould succeed.\n\nDelete the stale virtqueues before rebuilding them. If restore fails\nbefore virtio_device_ready(), reuse the remove path to stop the device.\nOnce the device is ready, return errors directly instead of deleting the\nvirtqueues again."
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            "baseSeverity": "HIGH",
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              "value": "AV:L - The bug is reached only through the kernel system sleep PM path (suspend/hibernate freeze/thaw/restore) that calls virtio_pci_restore() -\u003e virtio_device_restore() -\u003e viortc_restore(); it is not reachable from network packets, remote protocols, or physical device attachment.\nAC:L - Any actor who can drive a suspend/hibernate cycle on a guest with virtio-pci virtio_rtc can trigger restore; virtio-pci routinely retries MSI-X allocation policies and the commit notes the crash occurs on a failed attempt before a later one would succeed, so success does not depend on uncontrollable timing or layout.\nPR:L - Triggering suspend/hibernate/thaw is available to unprivileged local users on typical desktop, mobile, and embedded systems via logind/power interfaces or RTC alarm wake without requiring real root in the init namespace or capabilities unavailable in user namespaces.\nUI:N - Exploitation requires only initiating or allowing system suspend/hibernate and resume; no separate victim user action such as opening a file, mounting a filesystem, or clicking a prompt is needed beyond the attacker\u0027s own power-management trigger.\nS:U - The fault corrupts or crashes the same guest kernel that owns the virtio_rtc driver during PM restore; it does not cross a VM/host, IOMMU, or sandbox security boundary to impact a different authority.\nC:H - Failed virtqueue reinit leaves stale queues on vdev-\u003evqs while vp_del_vqs() indexes a new vp_dev-\u003evqs array, causing NULL or mismatched virtio_pci_vq_info teardown that can corrupt heap metadata and disclose kernel memory beyond a simple bounded fault.\nI:H - The same mismatched vp_del_vq()/vp_del_vqs() teardown can corrupt kernel linked lists and free or misuse queue metadata, providing a plausible path to further memory corruption and control-flow hijack rather than only an immediate crash.\nA:H - The documented failure mode is a NULL pointer dereference in vp_del_vq() during restore that oopses or panics the guest kernel, and a failed restore can also leave the system unable to resume cleanly from suspend/hibernate."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-74311",
    "datePublished": "2026-08-15T05:58:10.711Z",
    "dateReserved": "2026-08-15T05:44:03.883Z",
    "dateUpdated": "2026-08-17T05:45:43.827Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T11:22:22+00:00",
      "cve": "CVE-2026-74311",
      "id": "CVE-2026-74311",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: virtio: rtc: tear down old virtqueues before restore",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74311.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.

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  • 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.


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