CVE-2026-74614 (GCVE-0-2026-74614)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
vsock/virtio: read virtqueues under worker locks
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: read virtqueues under worker locks Commit bd50c5dc182b ("vsock/virtio: add support for device suspend/resume") made the *_run flags transition from false to true when restore installs replacement virtqueues. The RX, TX and event workers read their virtqueue before locking and checking the corresponding flag, so a worker delayed across freeze and restore can observe the replacement queue's running state while retaining a pointer to the deleted queue. Read each virtqueue under its mutex after checking the run flag, keeping the pointer and state in the same queue generation.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 762c251c7f5c4ee5bef71460c6e822ed293fd69f , < 941329ce14c5f481223a10d1d4c8b57ea7f3048a (git)
Affected: bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c , < 29dd10583bf9d2744cd84b862e4257c0a5699570 (git)
Affected: bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c , < a1fb0c5b8a7c2753758aeced40971f99449dde0c (git)
Affected: bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c , < eae099c764c7ebdb842eb1f638913e310bdd6513 (git)
Affected: bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c , < bd43a7ec668be428265b3209eb43647aedcf720a (git)
Affected: bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c , < 1cecb4202afdbeddcf29d59baf596ac6ab753f7f (git)
Affected: bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c , < ebac8f6b1ef0e9278afe204b8692a7479988dace (git)
Affected: 5.15.138 , < 5.15.216 (semver)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (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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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: read virtqueues under worker locks\n\nCommit bd50c5dc182b (\"vsock/virtio: add support for device\nsuspend/resume\") made the *_run flags transition from false to true when\nrestore installs replacement virtqueues.  The RX, TX and event workers\nread their virtqueue before locking and checking the corresponding flag,\nso a worker delayed across freeze and restore can observe the replacement\nqueue\u0027s running state while retaining a pointer to the deleted queue.\n\nRead each virtqueue under its mutex after checking the run flag, keeping\nthe pointer and state in the same queue generation."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - The bug is in the guest virtio-vsock driver reached via AF_VSOCK sockets and virtio virtqueue completions, not via routable network protocols; per kernel CNA guidance vsock and virtio guest-driver bugs are scored Local even when the hypervisor is the peer.\nAC:L - An attacker or malicious host controls both sides of the race by flooding vsock/virtqueue traffic to queue RX/TX/event workers while virtio_vsock_freeze/restore deletes and replaces virtqueues, making the stale pre-lock virtqueue pointer race reliable and repeatable.\nPR:N - No guest privileges are required in the highest-impact scenario: a malicious hypervisor or host-initiated suspend/migrate triggers freeze/restore while virtio completions queue workers, matching confidential-computing models where the host is untrusted and holds no guest credentials.\nUI:N - Vulnerable RX/TX/event workers run automatically from virtqueue IRQ callbacks on a dedicated workqueue; no victim must mount filesystems, open files, or take deliberate action beyond normal virtio-vsock device operation and VM lifecycle events.\nS:U - Corruption is confined to the guest kernel virtio-vsock driver; exploited impact stays within the guest security boundary and does not cross to the hypervisor (guest-to-host escape would involve vhost-vsock on the host, not this guest-side driver).\nC:H - Use-after-free of a deleted virtqueue: virtqueue_disable_cb, virtqueue_get_buf, and virtqueue_enable_cb dereference freed vring_virtqueue slab memory, enabling attacker-controlled reuse and arbitrary kernel memory disclosure typical of virtio UAF bugs.\nI:H - Corrupted virtqueue metadata permits out-of-bounds ring/index manipulation and further virtqueue operations, furnishing heap corruption and arbitrary-write primitives suitable for guest ring-0 code execution and privilege escalation.\nA:H - Operating on freed virtqueues triggers KASAN slab-use-after-free and kernel BUG/oops/panic (as in the related virtio-vsock freeze bug CVE-2026-74613), fully denying guest availability even when full exploitation is not attempted."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-74614",
    "datePublished": "2026-08-22T15:31:59.800Z",
    "dateReserved": "2026-08-15T05:44:03.920Z",
    "dateUpdated": "2026-08-25T05:40:40.984Z",
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      "initial_release_date": "2026-08-24T01:08:15.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vsock/virtio: read virtqueues under worker locks",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74614.json",
      "version": "2"
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The RX, TX and event workers\\nread their virtqueue before locking and checking the corresponding flag,\\nso a worker delayed across freeze and restore can observe the replacement\\nqueue\u0027s running state while retaining a pointer to the deleted queue.\\n\\nRead each virtqueue under its mutex after checking the run flag, keeping\\nthe pointer and state in the same queue generation.\"}],\"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\":\"762c251c7f5c4ee5bef71460c6e822ed293fd69f\",\"lessThan\":\"941329ce14c5f481223a10d1d4c8b57ea7f3048a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c\",\"lessThan\":\"29dd10583bf9d2744cd84b862e4257c0a5699570\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c\",\"lessThan\":\"a1fb0c5b8a7c2753758aeced40971f99449dde0c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c\",\"lessThan\":\"eae099c764c7ebdb842eb1f638913e310bdd6513\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c\",\"lessThan\":\"bd43a7ec668be428265b3209eb43647aedcf720a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c\",\"lessThan\":\"1cecb4202afdbeddcf29d59baf596ac6ab753f7f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c\",\"lessThan\":\"ebac8f6b1ef0e9278afe204b8692a7479988dace\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.138\",\"lessThan\":\"5.15.216\",\"versionType\":\"semver\",\"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\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"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:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1cecb4202afdbeddcf29d59baf596ac6ab753f7f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/29dd10583bf9d2744cd84b862e4257c0a5699570\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/941329ce14c5f481223a10d1d4c8b57ea7f3048a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1fb0c5b8a7c2753758aeced40971f99449dde0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd43a7ec668be428265b3209eb43647aedcf720a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eae099c764c7ebdb842eb1f638913e310bdd6513\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ebac8f6b1ef0e9278afe204b8692a7479988dace\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:51:03+00:00",
      "cve": "CVE-2026-74614",
      "id": "CVE-2026-74614",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vsock/virtio: read virtqueues under worker locks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74614.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

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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.