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, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-479-1, DSA-3434-1, DSA-3471-1, DSA-3519-1
NVD severitymedium (attack range: local)
Debian Bugs809229, 823620

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)wheezy3.2.78-1fixed
wheezy (security)3.2.93-1fixed
jessie3.16.43-2+deb8u2fixed
jessie (security)3.16.43-2+deb8u5fixed
stretch4.9.30-2+deb9u2fixed
stretch (security)4.9.30-2+deb9u5fixed
buster, sid4.12.13-1fixed
qemu (PTS)wheezy1.1.2+dfsg-6a+deb7u12fixed
wheezy (security)1.1.2+dfsg-6+deb7u23fixed
jessie (security), jessie1:2.1+dfsg-12+deb8u6fixed
stretch1:2.8+dfsg-6fixed
stretch (security)1:2.8+dfsg-6+deb9u2fixed
buster1:2.8+dfsg-7fixed
sid1:2.10.0+dfsg-1fixed
qemu-kvm (PTS)wheezy1.1.2+dfsg-6+deb7u12fixed
wheezy (security)1.1.2+dfsg-6+deb7u23fixed
xen (PTS)wheezy4.1.4-3+deb7u9vulnerable
wheezy (security)4.1.6.lts1-8fixed
jessie4.4.1-9+deb8u9fixed
jessie (security)4.4.1-9+deb8u10fixed
buster, sid, stretch4.8.1-1+deb9u1fixed
stretch (security)4.8.1-1+deb9u3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.3.3-3medium
linuxsourceexperimental4.4~rc6-1~exp1medium
linuxsourcejessie3.16.7-ckt20-1+deb8u2mediumDSA-3434-1
linuxsourcewheezy3.2.73-2+deb7u2mediumDSA-3434-1
linux-2.6source(unstable)(unfixed)medium
qemusource(unstable)1:2.5+dfsg-2medium809229
qemusourcejessie1:2.1+dfsg-12+deb8u5amediumDSA-3471-1
qemusourcesqueeze(not affected)
qemusourcewheezy(not affected)
qemu-kvmsource(unstable)(unfixed)medium
qemu-kvmsourcesqueeze(not affected)
qemu-kvmsourcewheezy(not affected)
xensource(unstable)4.8.0~rc3-1medium823620
xensourcejessie4.4.1-9+deb8u4mediumDSA-3519-1
xensourcesqueeze(unfixed)end-of-life
xensourcewheezy4.1.6.1-1+deb7u1mediumDLA-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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