A QEMU security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 21.10, and 22.04 LTS.

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Ubuntu Security Notice USN-5489-1
June 21, 2022

qemu vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in QEMU.

Software Description:
- qemu: Machine emulator and virtualizer

Details:

Alexander Bulekov discovered that QEMU incorrectly handled floppy disk
emulation. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service, or possibly leak
sensitive information. (CVE-2021-3507)

It was discovered that QEMU incorrectly handled NVME controller emulation.
An attacker inside the guest could use this issue to cause QEMU to crash,
resulting in a denial of service, or possibly execute arbitrary code. This
issue only affected Ubuntu 22.04 LTS. (CVE-2021-3929)

It was discovered that QEMU incorrectly handled QXL display device
emulation. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-4206, CVE-2021-4207)

Jietao Xiao, Jinku Li, Wenbo Shen, and Nanzi Yang discovered that QEMU
incorrectly handled the virtiofsd shared file system daemon. An attacker
inside the guest could use this issue to create files with incorrect
ownership, possibly leading to privilege escalation. This issue only
affected Ubuntu 22.04 LTS. (CVE-2022-0358)

It was discovered that QEMU incorrectly handled virtio-net devices. A
privileged attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2022-26353)

It was discovered that QEMU incorrectly handled vhost-vsock devices. A
privileged attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2022-26354)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS:
qemu-system 1:6.2+dfsg-2ubuntu6.2
qemu-system-arm 1:6.2+dfsg-2ubuntu6.2
qemu-system-mips 1:6.2+dfsg-2ubuntu6.2
qemu-system-misc 1:6.2+dfsg-2ubuntu6.2
qemu-system-ppc 1:6.2+dfsg-2ubuntu6.2
qemu-system-s390x 1:6.2+dfsg-2ubuntu6.2
qemu-system-sparc 1:6.2+dfsg-2ubuntu6.2
qemu-system-x86 1:6.2+dfsg-2ubuntu6.2
qemu-system-x86-microvm 1:6.2+dfsg-2ubuntu6.2
qemu-system-x86-xen 1:6.2+dfsg-2ubuntu6.2

Ubuntu 21.10:
qemu-system 1:6.0+dfsg-2expubuntu1.3
qemu-system-arm 1:6.0+dfsg-2expubuntu1.3
qemu-system-mips 1:6.0+dfsg-2expubuntu1.3
qemu-system-misc 1:6.0+dfsg-2expubuntu1.3
qemu-system-ppc 1:6.0+dfsg-2expubuntu1.3
qemu-system-s390x 1:6.0+dfsg-2expubuntu1.3
qemu-system-sparc 1:6.0+dfsg-2expubuntu1.3
qemu-system-x86 1:6.0+dfsg-2expubuntu1.3
qemu-system-x86-microvm 1:6.0+dfsg-2expubuntu1.3
qemu-system-x86-xen 1:6.0+dfsg-2expubuntu1.3

Ubuntu 20.04 LTS:
qemu-system 1:4.2-3ubuntu6.23
qemu-system-arm 1:4.2-3ubuntu6.23
qemu-system-mips 1:4.2-3ubuntu6.23
qemu-system-misc 1:4.2-3ubuntu6.23
qemu-system-ppc 1:4.2-3ubuntu6.23
qemu-system-s390x 1:4.2-3ubuntu6.23
qemu-system-sparc 1:4.2-3ubuntu6.23
qemu-system-x86 1:4.2-3ubuntu6.23
qemu-system-x86-microvm 1:4.2-3ubuntu6.23
qemu-system-x86-xen 1:4.2-3ubuntu6.23

Ubuntu 18.04 LTS:
qemu-system 1:2.11+dfsg-1ubuntu7.40
qemu-system-arm 1:2.11+dfsg-1ubuntu7.40
qemu-system-mips 1:2.11+dfsg-1ubuntu7.40
qemu-system-misc 1:2.11+dfsg-1ubuntu7.40
qemu-system-ppc 1:2.11+dfsg-1ubuntu7.40
qemu-system-s390x 1:2.11+dfsg-1ubuntu7.40
qemu-system-sparc 1:2.11+dfsg-1ubuntu7.40
qemu-system-x86 1:2.11+dfsg-1ubuntu7.40

After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5489-1
CVE-2021-3507, CVE-2021-3929, CVE-2021-4206, CVE-2021-4207,
CVE-2022-0358, CVE-2022-26353, CVE-2022-26354

Package Information:
  https://launchpad.net/ubuntu/+source/qemu/1:6.2+dfsg-2ubuntu6.2
  https://launchpad.net/ubuntu/+source/qemu/1:6.0+dfsg-2expubuntu1.3
  https://launchpad.net/ubuntu/+source/qemu/1:4.2-3ubuntu6.23
  https://launchpad.net/ubuntu/+source/qemu/1:2.11+dfsg-1ubuntu7.40