| Name | CVE-2016-7466 |
| Description | Memory leak in the usb_xhci_exit function in hw/usb/hcd-xhci.c in QEMU (aka Quick Emulator), when the xhci uses msix, allows local guest OS administrators to cause a denial of service (memory consumption and possibly QEMU process crash) by repeatedly unplugging a USB device. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 838687 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| qemu (PTS) | buster | 1:3.1+dfsg-8+deb10u8 | fixed |
| buster (security) | 1:3.1+dfsg-8+deb10u12 | fixed |
| bullseye | 1:5.2+dfsg-11+deb11u3 | fixed |
| bullseye (security) | 1:5.2+dfsg-11+deb11u2 | fixed |
| bookworm | 1:7.2+dfsg-7+deb12u5 | fixed |
| trixie | 1:8.2.1+ds-2 | fixed |
| sid | 1:8.2.2+ds-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| qemu | source | jessie | (not affected) | | | |
| qemu | source | (unstable) | 1:2.7+dfsg-1 | | | 838687 |
| qemu-kvm | source | wheezy | (not affected) | | | |
| qemu-kvm | source | (unstable) | (unfixed) | | | |
Notes
[jessie] - qemu <not-affected> (Vulnerable code not present. Introduced in 2.2.x)
[wheezy] - qemu <no-dsa> (Minor issue, needs qemu monitor access to unplug nec-xhci controller)
[wheezy] - qemu-kvm <not-affected> (Minor issue, needs qemu monitor access to unplug nec-xhci controller)
https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg02773.html
Fixed by: http://git.qemu.org/?p=qemu.git;a=commit;h=b53dd4495ced2432a0b652ea895e651d07336f7e
The usb_xhci_exit and thus the patched code was introduced in:
http://git.qemu.org/?p=qemu.git;a=commit;h=53c30545fb34c43c84d62ea1c2b0dc6b53303c34 (v2.2.0-rc0)
https://www.openwall.com/lists/oss-security/2016/09/19/8