Description
The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR).
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 | 1:2.6+dfsg-2 | — |
| Debian 13 | qemu | 1:2.6+dfsg-2 | — |
| Debian 12 | qemu | 1:2.6+dfsg-2 | — |
| Debian 8 | qemu | 1:2.1+dfsg-12+deb8u8 | DLA-1599-1 |
| Debian 7 | qemu +1 | 1.1.2+dfsg-6+deb7u14 | DLA-574-1, DLA-573-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | qemu | 1:2.5+dfsg-5ubuntu10.1 | USN-2974-1 |
| Ubuntu 14.04 LTS | qemu | 2.0.0+dfsg-2ubuntu1.24 | USN-2974-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | qemu-img +3 | 10:1.5.3-141.el7 | RHSA-2017:1856 |
| RHEL 7 | qemu-img-rhev +3 | 10:2.9.0-14.el7 | RHSA-2017:2392 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenStack 11 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 10 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 9 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 8 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 7 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
| Red Hat OpenStack 6 | qemu-img-rhev +3 | 10:2.9.0-10.el7 | RHSA-2017:2408 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | qemu | 2.3.1-14.1 | SUSE-SU-2016:1703-1 |
| SLES 12 SP1 | xen | 4.5.3_08-17.1 | SUSE-SU-2016:2093-1 |
| SLES 12 | qemu | 2.0.2-48.19.1 | SUSE-SU-2016:1560-1 |
| SLES 12 | xen | 4.4.4_04-22.22.2 | SUSE-SU-2016:2533-1 |
| SLES 11 SP4 | kvm | 1.4.2-44.1 | SUSE-SU-2016:1785-1 |
| SLES 11 SP4 | xen | 4.4.4_07-37.1 | SUSE-SU-2016:2100-1 |
| SLES 11 SP3 | kvm | 1.4.2-46.1 | SUSE-SU-2016:1698-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | qemu | 2.3.1-14.1 | SUSE-SU-2016:1703-1 |
| SLES for SAP 12 SP1 | xen | 4.5.3_08-17.1 | SUSE-SU-2016:2093-1 |
| SLES for SAP 12 | qemu | 2.0.2-48.19.1 | SUSE-SU-2016:1560-1 |
| SLES for SAP 12 | xen | 4.4.4_04-22.22.2 | SUSE-SU-2016:2533-1 |
| SLES for SAP 11 SP4 | kvm | 1.4.2-44.1 | SUSE-SU-2016:1785-1 |
| SLES for SAP 11 SP4 | xen | 4.4.4_07-37.1 | SUSE-SU-2016:2100-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | qemu +1 | 2.6.1-1.5 | openSUSE-SU-2024:10285-1, openSUSE-SU-2024:10233-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | qemu-img +3 | 10:1.5.3-141.el7 | ELSA-2017-1856 |
Advisories 17
- RHSA-2017:2392 Red Hat Security Advisory: qemu-kvm-rhev security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:1856 Red Hat Security Advisory: qemu-kvm security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:2408 Red Hat Security Advisory: qemu-kvm-rhev security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DLA-574-1 qemu-kvm - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-573-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1599-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2974-1 qemu, qemu-kvm vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2016:1703-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1785-1 Security update for kvm SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1560-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10285-1 qemu-linux-user-2.6.1-1.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2533-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2100-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1698-1 Security update for kvm SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2093-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10233-1 qemu-2.6.1-1.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2017-1856 Moderate: qemu-kvm security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 7, 2017
References
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c937b09fb0
- https://bugzilla.redhat.com/show_bug.cgi?id=1313686
- [qemu-devel] 20160407 [Qemu-devel] [PATCH] i386: kvmvapic: initialise imm32 variable mailing-list
- 86067 vdb-entry
- [qemu-devel] 20160407 Re: [Qemu-devel] [PATCH] i386: kvmvapic: initialise imm32 variable mailing-list
- RHSA-2017:2392 vendor-advisory
- GLSA-201609-01 vendor-advisory
- USN-2974-1 vendor-advisory
- [debian-lts-announce] 20181130 [SECURITY] [DLA 1599-1] qemu security update mailing-list
- RHSA-2017:2408 vendor-advisory
- RHSA-2017:1856 vendor-advisory