Description
Memory leak in the v9fs_device_unrealize_common function in hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local privileged guest OS users to cause a denial of service (host memory consumption and possibly QEMU process crash) via vectors involving the order of resource cleanup.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | qemu | 1:2.8+dfsg-1 | — |
| Debian 13 | qemu | 1:2.8+dfsg-1 | — |
| Debian 12 | qemu | 1:2.8+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | qemu | 1:2.5+dfsg-5ubuntu10.11 | USN-3261-1 |
| Ubuntu 14.04 LTS | qemu | 2.0.0+dfsg-2ubuntu1.33 | USN-3261-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | qemu | 2.6.2-39.1 | SUSE-SU-2017:0127-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | qemu | 2.6.2-39.1 | SUSE-SU-2017:0127-1 |
Advisories 2
- USN-3261-1 qemu vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:0127-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 94729 vdb-entry
- [qemu-devel] 20161116 [PATCH v3 0/4] 9pfs: add cleanup operation in handle/proxy backend mailing-list
- GLSA-201701-49 vendor-advisory
- [oss-security] 20161207 CVE request Qemu: 9pfs: memory leakage via proxy/handle callbacks mailing-list
- [oss-security] 20161208 Re: CVE request Qemu: 9pfs: memory leakage via proxy/handle callbacks mailing-list
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=4774718e5c194026ba5ee7a28d9be49be3080e42