CVE-2015-2877

NameCVE-2015-2877
DescriptionKernel 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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)buster4.19.249-2vulnerable (unimportant)
buster (security)4.19.304-1vulnerable (unimportant)
bullseye5.10.209-2vulnerable (unimportant)
bullseye (security)5.10.205-2vulnerable (unimportant)
bookworm6.1.76-1vulnerable (unimportant)
bookworm (security)6.1.69-1vulnerable (unimportant)
trixie6.6.15-2vulnerable (unimportant)
sid6.7.9-2vulnerable (unimportant)

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

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