{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74614", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.920Z", "datePublished": "2026-08-22T15:31:59.800Z", "dateUpdated": "2026-10-16T19:06:01.847Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:40.984Z" }, "descriptions": [ { "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's 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": [ { "cvssV3_1": { "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" }, "scenarios": [ { "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/vmw_vsock/virtio_transport.c" ], "versions": [ { "version": "762c251c7f5c4ee5bef71460c6e822ed293fd69f", "lessThan": "941329ce14c5f481223a10d1d4c8b57ea7f3048a", "status": "affected", "versionType": "git" }, { "version": "bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c", "lessThan": "29dd10583bf9d2744cd84b862e4257c0a5699570", "status": "affected", "versionType": "git" }, { "version": "bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c", "lessThan": "a1fb0c5b8a7c2753758aeced40971f99449dde0c", "status": "affected", "versionType": "git" }, { "version": "bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c", "lessThan": "eae099c764c7ebdb842eb1f638913e310bdd6513", "status": "affected", "versionType": "git" }, { "version": "bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c", "lessThan": "bd43a7ec668be428265b3209eb43647aedcf720a", "status": "affected", "versionType": "git" }, { "version": "bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c", "lessThan": "1cecb4202afdbeddcf29d59baf596ac6ab753f7f", "status": "affected", "versionType": "git" }, { "version": "bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c", "lessThan": "ebac8f6b1ef0e9278afe204b8692a7479988dace", "status": "affected", "versionType": "git" }, { "version": "5.15.138", "lessThan": "5.15.216", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/vmw_vsock/virtio_transport.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.138", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/941329ce14c5f481223a10d1d4c8b57ea7f3048a" }, { "url": "https://git.kernel.org/stable/c/29dd10583bf9d2744cd84b862e4257c0a5699570" }, { "url": "https://git.kernel.org/stable/c/a1fb0c5b8a7c2753758aeced40971f99449dde0c" }, { "url": "https://git.kernel.org/stable/c/eae099c764c7ebdb842eb1f638913e310bdd6513" }, { "url": "https://git.kernel.org/stable/c/bd43a7ec668be428265b3209eb43647aedcf720a" }, { "url": "https://git.kernel.org/stable/c/1cecb4202afdbeddcf29d59baf596ac6ab753f7f" }, { "url": "https://git.kernel.org/stable/c/ebac8f6b1ef0e9278afe204b8692a7479988dace" } ], "title": "vsock/virtio: read virtqueues under worker locks", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-74614", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:02:27.223007Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:06:01.847Z" } } ] } }