What’s Vulnerable › Vulnerabilities
CVE-2015-2877
- Severity: low (CVSS 3.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2017-03-03 · updated 2026-06-17
- Weakness: CWE-200
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
Affected products
- Linux kernel: from 2.6.32 through 4.20.15
- Red Hat Enterprise Linux: 4.0, 5.0, 6.0, 7.0
References
- http://www.antoniobarresi.com/files/cain_advisory.txt
- http://www.kb.cert.org/vuls/id/935424
- http://www.securityfocus.com/bid/76256
- https://bugzilla.redhat.com/show_bug.cgi?id=1252096
- https://www.kb.cert.org/vuls/id/BGAR-A2CNKG
- https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH
- https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf
- http://www.antoniobarresi.com/files/cain_advisory.txt
- http://www.kb.cert.org/vuls/id/935424
- http://www.securityfocus.com/bid/76256
- https://bugzilla.redhat.com/show_bug.cgi?id=1252096
- https://www.kb.cert.org/vuls/id/BGAR-A2CNKG
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