Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2026-93834
- https://bugzilla.redhat.com/show_bug.cgi?id=2537939
- https://gitlab.com/qemu-project/qemu/-/work_items/4491
- https://gitlab.com/qemu-project/qemu/-/work_items/4491
FAQ
What is CVE-2026-93834?
CVE-2026-93834 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 maliciou...
How severe is CVE-2026-93834?
CVE-2026-93834 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-93834?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.