{"id":"CVE-2015-2877","url":"https://www.cyber-defence.io/tools/cve/CVE-2015-2877","generatedAt":"2026-10-27T20:51:40.357Z","title":"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…","description":"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","published":"2017-03-03T11:59:00.000Z","lastModified":"2026-06-17T00:24:55.000Z","status":"Modified","sourceIdentifier":"cret@cert.org","cvss":{"version":"3.1","score":3.3,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},"cwe":["CWE-200"],"affected":["linux/linux kernel","redhat/enterprise linux"],"epss":{"score":0.00942,"percentile":0.60732,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.94%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://www.antoniobarresi.com/files/cain_advisory.txt","tags":["Technical Description","Third Party Advisory"],"source":"cret@cert.org"},{"url":"http://www.kb.cert.org/vuls/id/935424","tags":["Third Party Advisory","US Government Resource"],"source":"cret@cert.org"},{"url":"http://www.securityfocus.com/bid/76256","tags":["Third Party Advisory","VDB Entry"],"source":"cret@cert.org"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1252096","tags":["Issue Tracking","Third Party Advisory"],"source":"cret@cert.org"},{"url":"https://www.kb.cert.org/vuls/id/BGAR-A2CNKG","tags":["Third Party Advisory","US Government Resource"],"source":"cret@cert.org"},{"url":"https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH","tags":["Third Party Advisory","US Government Resource"],"source":"cret@cert.org"},{"url":"https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf","tags":["Technical Description","Third Party Advisory"],"source":"cret@cert.org"},{"url":"http://www.antoniobarresi.com/files/cain_advisory.txt","tags":["Technical Description","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.kb.cert.org/vuls/id/935424","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/76256","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1252096","tags":["Issue Tracking","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.kb.cert.org/vuls/id/BGAR-A2CNKG","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf","tags":["Technical Description","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2015-2877","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}