{"id":"EM-20261102-9IIR","url":"https://cyber.eventmonitor.net/incident/EM-20261102-9IIR/","type":"cve","title":"Linux Kernel Vulnerability (CVE-2026-99231)","subtitle":"CVE-2026-99231","subject":"CVE-2026-99231","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-02T16:17:48.060Z","firstSignal":"2026-11-02T16:06:38.000Z","lastSignal":"2026-11-02T16:17:48.060Z","updated":"2026-11-04T14:43:58.877Z","revision":1,"life":[{"status":"Born","at":"2026-11-02T16:17:48.060Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-11-02T16:17:48.060Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-02T16:06:38.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-02T16:17:48.060Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261102-9IIR created."}],"stages":[{"name":"Disclosed","at":"2026-11-02T16:17:48.060Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-02T16:17:48.060Z","detail":"CVSS 7.8 · EPSS 0.1%"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-02T16:06:38.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-02T16:06:38.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":3,"title":"Red Hat: CVE-2026-99231 (important)","text":"kernel: kernel: Privilege escalation via use-after-free in io_uring waitid","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-99231.json"},{"at":"2026-11-02T16:17:48.060Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-99231 (CVSS 7.8)","text":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/waitid: own the request before clearing ->head\n\nio_waitid_remove_wq() only takes the wait queue lock if ->head is set.\nio_waitid_wait() clears ->head first thing, before it tries to become the\nowner of the request by bumping ->refs. If somebody else owns the request\nat that point, nothing keeps it from completing the request while the\nwake up handler is still going to touch it:\n\nCPU0 (io_waitid_wait)                 CPU1 (io_waitid, holds a ref)\nlist_del_init(&wait->entry)\nsmp_store_release(&iw->head, NULL)\n         ","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99231"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-02T16:17:48.060","score":7.8,"severity":"HIGH","desc":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/waitid: own the request before clearing ->head\n\nio_waitid_remove_wq() only takes the wait queue lock if ->head is set.\nio_waitid_wait() clears ->head first thing, before it tries to become the\nowner of the request by bumpi","product":"","seen":1793803438877},"kev":null,"epss":{"epss":0.00117,"pct":0.0166,"at":1793803438877},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}