{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80932", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.802Z", "datePublished": "2026-09-11T19:42:07.012Z", "dateUpdated": "2026-10-19T08:45:16.044Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:16.044Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: flush works in dependency order\n\nvirtio_vsock_remove() stops the virtqueues and then flushes each work\nitem before freeing the enclosing virtio_vsock. The current order does\nnot account for dependencies between those items: tx_work may queue\nsend_pkt_work, and send_pkt_work may queue rx_work.\n\nIn particular, send_pkt_work can set restart_rx and release tx_lock.\nThe remove path can then stop the queues and flush rx_work before\nsend_pkt_work queues it. Although the later send_pkt_work flush waits\nfor that producer to finish, nothing waits for the newly queued rx_work,\nso kfree(vsock) can race with it.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in\n virtio_transport_rx_work+0x487/0x4b0\n Read of size 8 at addr ffff888114c2b008 by task kworker/1:1/47\n Workqueue: virtio_vsock virtio_transport_rx_work\n Call Trace:\n virtio_transport_rx_work+0x487/0x4b0\n process_one_work+0x688/0x1120\n worker_thread+0x45b/0xd10\n Allocated by task 1:\n virtio_vsock_probe+0xef/0x6b0\n Freed by task 84:\n kfree+0x131/0x3c0\n virtio_vsock_remove+0xd1/0x100\n\nFlush the works in producer-to-consumer order. virtio_vsock_vqs_del()\nhas already disabled the queue callbacks and cleared the run flags, so\nafter tx_work and send_pkt_work are drained, no source remains that can\nqueue rx_work after its flush." } ], "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 during virtio_vsock_remove(), reached via virtio device unplug and AF_VSOCK virtqueue completions rather than routed packets; kernel CNA guidance scores vsock and virtio guest-driver bugs as Local.\nAC:L - A malicious hypervisor controls both sides of the race by injecting vsock packets that generate RST replies so send_pkt_work sets restart_rx and queues rx_work, while concurrently hot-unplugging the device so remove() flushes rx_work too early; the attacker can retry and pause guest vCPUs, so success is not an uncontrolled condition.\nPR:N - No guest privileges are required: a malicious hypervisor or deprivileged VMM (Firecracker, crosvm, TDX/SEV-SNP) triggers device removal and virtqueue traffic with no guest credentials; host-sent packets to unbound ports generate reply skbs in kernel workqueues without any guest socket, user, or capability.\nUI:N - virtio_vsock_remove() and the racing send_pkt_work/rx_work items run from driver teardown and virtqueue IRQ workqueues; no guest user must mount a filesystem, open a device, or take any other action.\nS:U - The use-after-free corrupts the guest kernel virtio_vsock object and remains within the guest OS security authority; a guest-to-host escape would require a host vhost-vsock bug, not this guest-side remove path.\nC:H - KASAN reports a slab use-after-free read in virtio_transport_rx_work of the kfree'd virtio_vsock; a workqueue callback running on a freed slab object enables attacker-controlled reuse and arbitrary kernel memory disclosure.\nI:H - After kfree(vsock), pending rx_work still runs against the freed object (rx_lock, vqs, flags); slab reuse of that work_struct yields arbitrary writes and control-flow hijack typical of kernel workqueue UAFs, not merely a crash.\nA:H - The reported KASAN bug is a kernel slab-use-after-free in virtio_transport_rx_work during device removal, causing oops or panic and fully denying guest availability even without completing a privilege-escalation exploit." } ] } ], "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": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872", "lessThan": "e059a14c1067bcc4f7b1947cd09f2baab98e340f", "status": "affected", "versionType": "git" }, { "version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872", "lessThan": "531e2ac2dab1ab90a16427c4f9c86663633e9487", "status": "affected", "versionType": "git" }, { "version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872", "lessThan": "f3313d952fc380cff53db9a28451a8807aa67b43", "status": "affected", "versionType": "git" }, { "version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872", "lessThan": "b9cb4e8ba71c9fbd935d66baa71bbb0b87192c94", "status": "affected", "versionType": "git" }, { "version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872", "lessThan": "2187a56f2fd1715d54daed6392809223c60544f3", "status": "affected", "versionType": "git" }, { "version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872", "lessThan": "165a330a68b5f299d8735f0194c314cb2e571269", "status": "affected", "versionType": "git" }, { "version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872", "lessThan": "da5e9f08714c19ba04e6863aca69d40f042f2e04", "status": "affected", "versionType": "git" }, { "version": "0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872", "lessThan": "728836ebca239810f164262b10211ef59182f811", "status": "affected", "versionType": "git" } ] }, { "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": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "4.8", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e059a14c1067bcc4f7b1947cd09f2baab98e340f" }, { "url": "https://git.kernel.org/stable/c/531e2ac2dab1ab90a16427c4f9c86663633e9487" }, { "url": "https://git.kernel.org/stable/c/f3313d952fc380cff53db9a28451a8807aa67b43" }, { "url": "https://git.kernel.org/stable/c/b9cb4e8ba71c9fbd935d66baa71bbb0b87192c94" }, { "url": "https://git.kernel.org/stable/c/2187a56f2fd1715d54daed6392809223c60544f3" }, { "url": "https://git.kernel.org/stable/c/165a330a68b5f299d8735f0194c314cb2e571269" }, { "url": "https://git.kernel.org/stable/c/da5e9f08714c19ba04e6863aca69d40f042f2e04" }, { "url": "https://git.kernel.org/stable/c/728836ebca239810f164262b10211ef59182f811" } ], "title": "vsock/virtio: flush works in dependency order", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80932", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:21:23.480878Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:36.468Z" } } ] } }