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Vendor Workaround
Do not configure 9pfs/VirtFS filesystem sharing (-fsdev, -virtfs) on affected QEMU instances. If host-guest file sharing is required, use virtio-fs (virtiofsd) as an alternative, which does not use the vulnerable 9pfs code path.
Tracking
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Fri, 25 Sep 2026 14:30:00 +0000
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ssvc
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Fri, 25 Sep 2026 13:45:00 +0000
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| 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. | |
| Title | Qemu-kvm: 9pfs: use-after-free race in tlcreate/twalk allows vm guest escape | |
| First Time appeared |
Redhat
Redhat enterprise Linux Redhat enterprise Linux Nvidia Redhat openshift Redhat openstack |
|
| Weaknesses | CWE-416 | |
| CPEs | cpe:/a:redhat:enterprise_linux_nvidia: cpe:/a:redhat:openshift:4 cpe:/a:redhat:openstack:13 cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9 |
|
| Vendors & Products |
Redhat
Redhat enterprise Linux Redhat enterprise Linux Nvidia Redhat openshift Redhat openstack |
|
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-09-25T13:50:26.440Z
Reserved: 2026-09-18T18:12:23.908Z
Link: CVE-2026-93834
Updated: 2026-09-25T13:49:52.580Z
Status : Received
Published: 2026-09-25T14:17:24.063
Modified: 2026-09-25T14:17:24.063
Link: CVE-2026-93834
No data.
OpenCVE Enrichment
No data.
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CWE-416
Use After Free