{"id":"CVE-2026-93834","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-93834","summary":"A use-after-free vulnerability was found in QEMU's 9pfs subsystem. A race condition between the main thread and a worker thread when processing concurrent Tlcreate and Twalk requests…","details":"A use-after-free vulnerability was found in QEMU's 9pfs subsystem. A race condition between the main thread and a worker thread when processing concurrent Tlcreate and Twalk requests allows a malicious guest user to craft a fid path containing stale heap data, bypassing directory traversal restrictions and escaping the shared directory boundary. This can lead to arbitrary host file read/write and code execution (VM escape) as the QEMU process user.","published":"2026-09-25T14:17:24.063","modified":"2026-09-25T14:17:24.063","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-93834"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2537939"},{"type":"WEB","url":"https://gitlab.com/qemu-project/qemu/-/work_items/4491"},{"type":"WEB","url":"https://gitlab.com/qemu-project/qemu/-/work_items/4491"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-25T14:17:24.063"}}