DescriptionQuick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System (9pfs) support, is vulnerable to an improper access control issue. It could occur while accessing files on a shared host directory. A privileged user inside guest could use this flaw to access host file system beyond the shared folder and potentially escalating their privileges on a host.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs860785

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
qemu (PTS)buster1:3.1+dfsg-8+deb10u8fixed
buster (security)1:3.1+dfsg-8+deb10u10fixed
bullseye (security), bullseye1:5.2+dfsg-11+deb11u2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcejessie(not affected)
qemu-kvmsource(unstable)(not affected)


[jessie] - qemu <not-affected> (Vulnerable code introduced with fix for CVE-2016-9602)
[wheezy] - qemu <not-affected> (Vulnerable code introduced with fix for CVE-2016-9602)
- qemu-kvm <not-affected> (Vulnerable code introduced with fix for CVE-2016-9602)
Fixed by:;a=commitdiff;h=9c6b899f7a46893ab3b671e341a2234e9c0c060e
Fixed by (stable-2.8):;a=commitdiff;h=96bae145e27d4df62671b4eebd6c735f412016cf (v2.8.1.1)
Introduced by:;a=commitdiff;h=acf22d2264a131ad2695b5a18746dabf0cc8b843
which is part of the fix for CVE-2016-9602.

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