Kernel Samepage Merging (KSM) in the Linux kernel 2.6.32 through...
Vulnerability 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
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- http://www.securityfocus.com/bid/76256
- http://www.kb.cert.org/vuls/id/935424
- http://www.antoniobarresi.com/files/cain_advisory.txt
- https://www.kb.cert.org/vuls/id/BGAR-A2CNKG
- https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH
- https://bugzilla.redhat.com/show_bug.cgi?id=1252096
- https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf
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Timeline
CVSS Vectors
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.