CVE-2015-2877

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.

Bugs

• <https://launchpad.net/bugs/1484792&gt;

Notes