Description
hw/9pfs/cofile.c and hw/9pfs/9p.c in QEMU can modify an fid path while it is being accessed by a second thread, leading to (for example) a use-after-free outcome.
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 | 1:3.1+dfsg-1 | — |
| Debian 13 | qemu | 1:3.1+dfsg-1 | — |
| Debian 12 | qemu | 1:3.1+dfsg-1 | — |
| Debian 9 | qemu | 1:2.8+dfsg-6+deb9u6 | DSA-4454-1 |
| Debian 8 | qemu | 1:2.1+dfsg-12+deb8u9 | DLA-1646-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | qemu | 1:2.11+dfsg-1ubuntu7.8 | USN-3826-1 |
| Ubuntu 16.04 LTS | qemu | 1:2.5+dfsg-5ubuntu10.33 | USN-3826-1 |
| Ubuntu 14.04 LTS | qemu | 2.0.0+dfsg-2ubuntu1.44 | USN-3826-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | qemu | 2.11.2-9.20.1 | SUSE-SU-2019:0423-1 |
| SLES 12 SP4 | qemu | 2.11.2-5.8.1 | SUSE-SU-2019:0435-1 |
| SLES 12 SP3 | qemu | 2.9.1-6.28.1 | SUSE-SU-2019:0582-1 |
| SLES 12 SP2 | qemu | 2.6.2-41.49.1 | SUSE-SU-2019:0489-1 |
| SLES 12 SP1 | qemu | 2.3.1-33.20.1 | SUSE-SU-2019:0471-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | qemu | 2.0.2-48.49.3 | SUSE-SU-2019:0457-1 |
| SLES 11 SP4 | kvm | 1.4.2-60.21.1 | SUSE-SU-2019:13962-1 |
| SLES for SAP 12 SP4 | qemu | 2.11.2-5.8.1 | SUSE-SU-2019:0435-1 |
| SLES for SAP 12 SP3 | qemu | 2.9.1-6.28.1 | SUSE-SU-2019:0582-1 |
| SLES for SAP 12 SP2 | qemu | 2.6.2-41.49.1 | SUSE-SU-2019:0489-1 |
| SLES for SAP 12 SP1 | qemu | 2.3.1-33.20.1 | SUSE-SU-2019:0471-2 |
| SLES for SAP 11 SP4 | kvm | 1.4.2-60.21.1 | SUSE-SU-2019:13962-1 |
| SUSE OpenStack Cloud 7 | qemu | 2.6.2-41.49.1 | SUSE-SU-2019:0489-1 |
| SUSE Enterprise Storage 4 | qemu | 2.6.2-41.49.1 | SUSE-SU-2019:0489-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ivshmem-tools +2 | 15:3.1.0-1.el7 | ELSA-2019-4585 |
| Oracle Linux 7 | qemu +9 | 12:2.9.0-19.el7 | ELSA-2019-4585, ELSA-2019-4520 |
Advisories 14
- USN-3826-1 qemu vulnerabilities Ubuntu Security Notices (USN) · May 4, 2026
- DSA-4454-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1646-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:13962-1 Security update for kvm SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0471-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0457-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0423-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0471-2 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0489-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0435-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0582-1 Security update for qemu SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-1995 QEMU: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 2, 2024
- ELSA-2019-4585 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 15, 2019
- ELSA-2019-4520 Important: qemu security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 28, 2019
References
- [debian-lts-announce] 20190129 [SECURITY] [DLA 1646-1] qemu security update mailing-list
- [qemu-devel] 20181107 [PATCH] 9p: write lock path in v9fs_co_open2() mailing-list
- USN-3826-1 vendor-advisory
- [oss-security] 20181120 CVE-2018-19364 Qemu: 9pfs: Use-after-free due to race condition while updating fid path mailing-list
- [qemu-devel] 20181115 [PATCH] 9p: take write lock on fid path updates mailing-list
- FEDORA-2019-88a98ce795 vendor-advisory
- openSUSE-SU-2019:1074 vendor-advisory
- DSA-4454 vendor-advisory
- 20190531 [SECURITY] [DSA 4454-1] qemu security update mailing-list