Description
A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | qemu | up to, including 5.2.0 | — |
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 | 1:5.2+dfsg-4 | — |
| Debian 13 | qemu | 1:5.2+dfsg-4 | — |
| Debian 12 | qemu | 1:5.2+dfsg-4 | — |
| Debian 10 | qemu | 1:3.1+dfsg-8+deb10u9 | DLA-3099-1 |
| Debian 9 | qemu | 1:2.8+dfsg-6+deb9u13 | DLA-2560-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | qemu | 1:4.2-3ubuntu6.12 | USN-4725-1 |
| Ubuntu 18.04 LTS | qemu | 1:2.11+dfsg-1ubuntu7.35 | USN-4725-1 |
| Ubuntu 16.04 LTS | qemu | 1:2.5+dfsg-5ubuntu10.49 | USN-4725-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | qemu | 2.0.0+dfsg-2ubuntu1.47+esm6 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | qemu | 4.2.1-11.13.1 | SUSE-SU-2021:0521-1 |
| SLES 15 SP1 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SLES 15 | qemu | 2.11.2-9.43.1 | SUSE-SU-2021:1244-1 |
| SLES 12 SP5 | qemu | 3.1.1.1-48.2 | SUSE-SU-2021:1242-1 |
| SLES 12 SP4 | qemu | 2.11.2-5.29.1 | SUSE-SU-2021:1241-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SLES 12 SP2 | qemu | 2.6.2-41.62.1 | SUSE-SU-2021:1305-1 |
| SLES 11 SP4 | kvm | 1.4.2-60.34.1 | SUSE-SU-2021:14704-1 |
| SLES for SAP 15 SP1 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SLES for SAP 15 | qemu | 2.11.2-9.43.1 | SUSE-SU-2021:1244-1 |
| SLES for SAP 12 SP5 | qemu | 3.1.1.1-48.2 | SUSE-SU-2021:1242-1 |
| SLES for SAP 12 SP4 | qemu | 2.11.2-5.29.1 | SUSE-SU-2021:1241-1 |
| SLES for SAP 12 SP3 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SLE HPC 15 SP1 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SLE HPC 15 | qemu | 2.11.2-9.43.1 | SUSE-SU-2021:1244-1 |
| SUSE OpenStack Cloud Crowbar 9 | qemu | 2.11.2-5.29.1 | SUSE-SU-2021:1241-1 |
| SUSE OpenStack Cloud Crowbar 8 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SUSE OpenStack Cloud 9 | qemu | 2.11.2-5.29.1 | SUSE-SU-2021:1241-1 |
| SUSE OpenStack Cloud 8 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SUSE Manager Server 4.0 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SUSE Manager Retail Branch Server 4.0 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SUSE Manager Proxy 4.0 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | kvm | 1.4.2-53.38.1 | SUSE-SU-2021:14706-1 |
| SUSE HPE Helion OpenStack 8 | qemu | 2.9.1-6.47.1 | SUSE-SU-2021:1240-1 |
| SUSE Enterprise Storage 6 | qemu | 3.1.1.1-9.24.3 | SUSE-SU-2021:1245-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | qemu | 6.1.0-32.1 | openSUSE-SU-2024:11287-1 |
| openSUSE Leap 15.2 | qemu | 4.2.1-lp152.9.9.2 | openSUSE-SU-2021:0363-1 |
| openSUSE Leap 15.2 | qemu-linux-user | 4.2.1-lp152.9.9.3 | openSUSE-SU-2021:0363-1 |
| openSUSE Leap 15.2 | qemu-testsuite | 4.2.1-lp152.9.9.5 | openSUSE-SU-2021:0363-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | qemu | 6.0.0-r1 | — |
| Alpine v3.23 | qemu | 6.0.0-r1 | — |
| Alpine v3.22 | qemu | 6.0.0-r1 | — |
| Alpine v3.21 | qemu | 6.0.0-r1 | — |
| Alpine v3.20 | qemu | 6.0.0-r1 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | qemu | 6.0.0-r1 | — |
| Alpine v3.18 | qemu | 6.0.0-r1 | — |
| Alpine v3.17 | qemu | 6.0.0-r1 | — |
| Alpine v3.16 | qemu | 6.0.0-r1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | qemu +12 | 15:4.2.1-5.el7 | ELSA-2021-9109, ELSA-2021-9104 |
Advisories 17
- WID-SEC-2022-1279 QEMU: Schwachstelle ermöglicht Privilegieneskalation BSI CERT-Bund (WID) · Jun 29, 2026
- USN-4725-1 qemu vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3099-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2560-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:1305-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1240-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14704-1 Security update for kvm SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1245-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1241-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0363-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14706-1 Security update for kvm SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1242-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0521-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1244-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11287-1 qemu-6.1.0-32.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2021-9109 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 15, 2021
- ELSA-2021-9104 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 12, 2021
References
- https://www.zerodayinitiative.com/advisories/ZDI-21-159/
- [debian-lts-announce] 20210218 [SECURITY] [DLA 2560-1] qemu security update mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=1927007
- https://security.netapp.com/advisory/ntap-20210720-0009/
- [debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update mailing-list