CVE-2026-93834 QEMU - Use After Free

QEMU contains a use-after-free vulnerability caused by a race condition in the 9pfs subsystem during concurrent Tlcreate and Twalk requests, letting malicious guest users escape shared directory restrictions and execute code, exploit requires concurrent requests.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Remote Code Execution, File System Read, File System Write
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
25 September 2026
Updated
15 October 2026
Weakness
CWE-416

Vendor fix

Update to the latest QEMU version with the 9pfs subsystem fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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