Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Red Hat / Red Hat Enterprise Linux 10 | affected |
| Red Hat / Red Hat Enterprise Linux 6 | unaffected |
| Red Hat / Red Hat Enterprise Linux 7 | unaffected |
| Red Hat / Red Hat Enterprise Linux 7 | unaffected |
| Red Hat / Red Hat Enterprise Linux 8 | affected |
| Red Hat / Red Hat Enterprise Linux 8 | affected |
| Red Hat / Red Hat Enterprise Linux 9 | affected |
| Red Hat / Red Hat Enterprise Linux for NVIDIA 26 | unknown |
| Red Hat / Red Hat OpenShift Container Platform 4 | affected |
| Red Hat / Red Hat OpenShift Container Platform 4 | affected |
| Red Hat / Red Hat OpenStack Platform 13 (Queens) | unaffected |
CWE
CWE-416
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
ADP enrichment
No English description supplied.