{
  "modified": "2025-08-09T19:01:27Z",
  "published": "2017-03-03T11:59:00Z",
  "id": "CVE-2015-2877",
  "details": "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",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "http://www.antoniobarresi.com/files/cain_advisory.txt"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.kb.cert.org/vuls/id/935424"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.securityfocus.com/bid/76256"
    },
    {
      "type": "ADVISORY",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1252096"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.kb.cert.org/vuls/id/BGAR-A2CNKG"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf"
    },
    {
      "type": "ARTICLE",
      "url": "http://www.antoniobarresi.com/files/cain_advisory.txt"
    },
    {
      "type": "ARTICLE",
      "url": "https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1252096"
    },
    {
      "type": "WEB",
      "url": "http://www.kb.cert.org/vuls/id/935424"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/BGAR-A2CNKG"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH"
    }
  ],
  "database_specific": {
    "isDisputed": true
  }
}