What is CVE-2026-93834?

CVE-2026-93834 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Use After Free. CVSS score: 8.8/10. Published 2026-09-25.

How severe is CVE-2026-93834?

High severity. CVSS v3 base score is 8.8 out of 10.

Use After Free in Red Hat Enterprise Linux 10

CVE-2026-93834

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.

Vulnerability class: Use-After-Free

Published 2026-09-25.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-416 — Use After Free

References

access.redhat.com/security/cve/CVE-2026-93834 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)
gitlab.com/qemu-project/qemu/-/work_items/4491

Frequently asked questions

What is CVE-2026-93834?: CVE-2026-93834 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Use After Free. CVSS score: 8.8/10. Published 2026-09-25.
How severe is CVE-2026-93834?: High severity. CVSS v3 base score is 8.8 out of 10.