Advisoriesby IbisRed HatCVE-2026-93834
Red Hat QEMU: use after free
No fix yet
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 6 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 7 Product | all versions | No fix yet |
| all versions | No fix yet | |
| Red Hat Enterprise Linux 8 Product | all versions | No fix yet |
| all versions | No fix yet | |
| Red Hat Enterprise Linux 9 Product | all versions | No fix yet |
| Red Hat Enterprise Linux for NVIDIA 26 Product | all versions | No fix yet |
| Red Hat OpenShift Container Platform 4 Product | all versions | No fix yet |
| all versions | No fix yet | |
| Red Hat OpenShift Container Platform 5 Product | all versions | No fix yet |
| Red Hat OpenStack Platform 13 (Queens) Product | all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-416