Hi,

The following vulnerability was published for qemu.

CVE-2026-93834[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-93834
https://www.cve.org/CVERecord?id=CVE-2026-93834
[1] https://gitlab.com/qemu-project/qemu/-/work_items/4491
[2] https://gitlab.com/qemu-project/qemu/-/commit/fe9e30899ffceef25cf345ec83f76546afca19dd

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore