CVE-2015-2877

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

• CWE-200

• https://www.antoniobarresi.com/files/cain_advisory.txtTechnical Description, Third Party Advisory
• https://www.kb.cert.org/vuls/id/935424Third Party Advisory, US Government Resource
• https://www.securityfocus.com/bid/76256Third Party Advisory, VDB Entry
• https://bugzilla.redhat.com/show_bug.cgi?id=1252096Issue Tracking, Third Party Advisory
• https://www.kb.cert.org/vuls/id/BGAR-A2CNKGThird Party Advisory, US Government Resource
• https://www.kb.cert.org/vuls/id/BLUU-9ZAHZHThird Party Advisory, US Government Resource
• https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdfTechnical Description, Third Party Advisory
• https://www.antoniobarresi.com/files/cain_advisory.txtTechnical Description, Third Party Advisory
• https://www.kb.cert.org/vuls/id/935424Third Party Advisory, US Government Resource
• https://www.securityfocus.com/bid/76256Third Party Advisory, VDB Entry
• https://bugzilla.redhat.com/show_bug.cgi?id=1252096Issue Tracking, Third Party Advisory
• https://www.kb.cert.org/vuls/id/BGAR-A2CNKGThird Party Advisory, US Government Resource
• https://www.kb.cert.org/vuls/id/BLUU-9ZAHZHThird Party Advisory, US Government Resource
• https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdfTechnical Description, Third Party Advisory

Published

Mar 3, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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