Information disclosure in Linux Kernel
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
Vulnerability class: Information Disclosure
EPSS: 0.009 (57.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Linux Linux_kernel
- Redhat Enterprise_linux — versions 4.0, 5.0, 6.0
- N/a — versions n/a
Weakness classification (CWE)
References
- cret@cert.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
- cret@cert.org (US Government Resource, x_refsource_CERT-VN, Third Party Advisory, third-party-advisory)
- cret@cert.org (Technical Description, Third Party Advisory, x_refsource_MISC)
- cret@cert.org (US Government Resource, Third Party Advisory, x_refsource_MISC)
- cret@cert.org (US Government Resource, Third Party Advisory, x_refsource_MISC)
- cret@cert.org (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- cret@cert.org (Technical Description, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2015-2877?
- CVE-2015-2877 is a low-severity vulnerability in Linux Kernel, classified under Information Disclosure. CVSS score: 3.3/10. Published 2017-03-03.
- How severe is CVE-2015-2877?
- Low severity. CVSS v3 base score is 3.3 out of 10.