Debian: DSA-4506-1 Critical: QEMU DoS And Code Execution Risks

Multiple security issues were discovered in QEMU, a fast processor
emulator, which could result in denial of service, the execution of
arbitrary code or bypass of ACLs.

In addition this update fixes a regression which could cause NBD
connections to hang.

For the oldstable distribution (stretch), these problems have been fixed
in version 1:2.8+dfsg-6+deb9u8.

We recommend that you upgrade your qemu packages.

For the detailed security status of qemu please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/qemu

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/