Riskcovery

CVE-2026-93834

Qemu-kvm: 9pfs: use-after-free race in tlcreate/twalk allows vm guest escape

State
Published
Severity
8.8 High
Published
Sep 25, 2026
Updated
Oct 31, 2026
Reserved
Sep 18, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.18.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hredhat

Weaknesses

Affected Products

ProductVersions
Red Hat Enterprise Linux 10Red Hat
    Red Hat Enterprise Linux 6Red Hat
      Red Hat Enterprise Linux 7Red Hat
        Red Hat Enterprise Linux 7Red Hat
          Red Hat Enterprise Linux 8Red Hat
            Red Hat Enterprise Linux 8Red Hat
              Red Hat Enterprise Linux 9Red Hat
                Red Hat Enterprise Linux for NVIDIA 26Red Hat
                  Red Hat OpenShift Container Platform 4Red Hat
                    Red Hat OpenShift Container Platform 4Red Hat
                      Red Hat OpenShift Container Platform 5Red Hat
                        Red Hat OpenStack Platform 13 (Queens)Red Hat

                          References

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