CVE-2015-2877

NameCVE-2015-2877
Description** DISPUTED ** Kernel Samepage Merging (KSM) in the Linux kernel 2.6.32 through 4.x does not prevent use of a write-timing side channel, which allows guest OS users to defeat the ASLR protection mechanism on other guest OS instances via a Cross-VM ASL INtrospection (CAIN) attack. NOTE: the vendor states "Basically if you care about this attack vector, disable deduplication." Share-until-written approaches for memory conservation among mutually untrusting tenants are inherently detectable for information disclosure, and can be classified as potentially misunderstood behaviors rather than vulnerabilities.
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)
NVD severitylow (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie (security), jessie3.16.56-1+deb8u1vulnerable
stretch4.9.82-1+deb9u3vulnerable
stretch (security)4.9.88-1+deb9u1vulnerable
buster4.16.12-1vulnerable
sid4.16.16-2vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)(unfixed)unimportant
linux-2.6source(unstable)(unfixed)unimportant

Notes

https://www.usenix.org/conference/woot15/workshop-program/presentation/barresi
http://www.antoniobarresi.com/security/cloud/2015/07/30/cain/
Architectual limitation, workaround exists

Search for package or bug name: Reporting problems