{"id":"CVE-2026-80932","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-80932","summary":"vsock/virtio: flush works in dependency order","details":"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.","published":"2026-09-11T19:42:07.012Z","modified":"2026-09-14T03:45:49.170205072Z","cvss":{"score":8.4,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.109"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/165a330a68b5f299d8735f0194c314cb2e571269"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2187a56f2fd1715d54daed6392809223c60544f3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/728836ebca239810f164262b10211ef59182f811"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da5e9f08714c19ba04e6863aca69d40f042f2e04"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80932.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80932"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-14T03:45:49.170205072Z"}}