CVE-2015-8550

NameCVE-2015-8550
DescriptionXen, when used on a system providing PV backends, allows local guest OS administrators to cause a denial of service (host OS crash) or gain privileges by writing to memory shared between the frontend and backend, aka a double fetch vulnerability.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-479-1, DSA-3434-1, DSA-3471-1, DSA-3519-1
NVD severitymedium
Debian Bugs809229, 823620

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1fixed
jessie (security)3.16.76-1fixed
stretch4.9.189-3fixed
stretch (security)4.9.189-3+deb9u2fixed
buster4.19.67-2+deb10u1fixed
buster (security)4.19.67-2+deb10u2fixed
bullseye, sid5.3.15-1fixed
qemu (PTS)jessie1:2.1+dfsg-12+deb8u6fixed
jessie (security)1:2.1+dfsg-12+deb8u12fixed
stretch (security), stretch1:2.8+dfsg-6+deb9u8fixed
buster1:3.1+dfsg-8+deb10u2fixed
buster (security)1:3.1+dfsg-8+deb10u3fixed
bullseye1:4.1-3fixed
sid1:4.2-1fixed
xen (PTS)jessie4.4.1-9+deb8u10fixed
jessie (security)4.4.4lts5-0+deb8u1fixed
stretch (security), stretch4.8.5+shim4.10.2+xsa282-1+deb9u11fixed
bullseye, sid, buster4.11.1+92-g6c33308a8d-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.3.3-3
linuxsourceexperimental4.4~rc6-1~exp1
linuxsourcejessie3.16.7-ckt20-1+deb8u2DSA-3434-1
linuxsourcewheezy3.2.73-2+deb7u2DSA-3434-1
linux-2.6source(unstable)(unfixed)
qemusource(unstable)1:2.5+dfsg-2809229
qemusourcejessie1:2.1+dfsg-12+deb8u5aDSA-3471-1
qemusourcesqueeze(not affected)
qemusourcewheezy(not affected)
qemu-kvmsource(unstable)(unfixed)
qemu-kvmsourcesqueeze(not affected)
qemu-kvmsourcewheezy(not affected)
xensource(unstable)4.8.0~rc3-1823620
xensourcejessie4.4.1-9+deb8u4DSA-3519-1
xensourcesqueeze(unfixed)end-of-life
xensourcewheezy4.1.6.1-1+deb7u1DLA-479-1

Notes

[squeeze] - linux-2.6 <no-dsa> (Xen not supported in Squeeze LTS)
[wheezy] - qemu <not-affected> (vulnerable code not present)
[squeeze] - qemu <not-affected> (vulnerable code not present)
[wheezy] - qemu-kvm <not-affected> (vulnerable code not present)
[squeeze] - qemu-kvm <not-affected> (vulnerable code not present)
[squeeze] - xen <end-of-life> (Unsupported in Squeeze LTS)
http://xenbits.xen.org/xsa/advisory-155.html
https://git.kernel.org/linus/454d5d882c7e412b840e3c99010fe81a9862f6fb
https://git.kernel.org/linus/0f589967a73f1f30ab4ac4dd9ce0bb399b4d6357
https://git.kernel.org/linus/68a33bfd8403e4e22847165d149823a2e0e67c9c
https://git.kernel.org/linus/1f13d75ccb806260079e0679d55d9253e370ec8a
https://git.kernel.org/linus/18779149101c0dd43ded43669ae2a92d21b6f9cb
https://git.kernel.org/linus/be69746ec12f35b484707da505c6c76ff06f97dc
https://git.kernel.org/linus/8135cf8b092723dbfcc611fe6fdcb3a36c9951c5

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