Description
Qemu before 2.0 block driver for Hyper-V VHDX Images is vulnerable to infinite loops and other potential issues when calculating BAT entries, due to missing bounds checks for block_size and logical_sector_size variables. These are used to derive other fields like 'sectors_per_block' etc. A user able to alter the Qemu disk image could ise this flaw to crash the Qemu instance resulting in DoS.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Qemu | before 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 | 2.0.0+dfsg-1 | — |
| Debian 13 | qemu | 2.0.0+dfsg-1 | — |
| Debian 12 | qemu | 2.0.0+dfsg-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | qemu-img +6 | 2:0.12.1.2-2.415.el6_5.8 | RHSA-2014:0421, RHSA-2014:0420 |
| RHEL 6 | rhev-hypervisor6 | 6.5-20140603.2.el6ev | RHSA-2014:0674 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenStack 4 | qemu-img-rhev +2 | 2:0.12.1.2-2.415.el6_5.8 | RHSA-2014:0434 |
| Red Hat OpenStack 3 | qemu-img-rhev +2 | 2:0.12.1.2-2.415.el6_5.8 | RHSA-2014:0435 |
Advisories 5
- RHSA-2014:0674 Red Hat Security Advisory: rhev-hypervisor6 3.4.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0434 Red Hat Security Advisory: qemu-kvm-rhev security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0435 Red Hat Security Advisory: qemu-kvm-rhev security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0421 Red Hat Security Advisory: qemu-kvm-rhev security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0420 Red Hat Security Advisory: qemu-kvm security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
References
- http://rhn.redhat.com/errata/RHSA-2014-0420.html
- http://rhn.redhat.com/errata/RHSA-2014-0421.html
- http://www.openwall.com/lists/oss-security/2014/03/26/8
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=1d7678dec4761acdc43439da6ceda41a703ba1a6
- https://bugzilla.redhat.com/show_bug.cgi?id=1078212
- https://lists.gnu.org/archive/html/qemu-devel/2014-03/msg04994.html