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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (59.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Linux Kernel
- Red Hat Enterprise Linux — versions 4.0, 5.0, 6.0
Weakness classification (CWE)
References
- www.securityfocus.com/bid/76256 (VDB Entry, Third Party Advisory, vdb-entry)
- www.kb.cert.org/vuls/id/935424 (US Government Resource, Third Party Advisory, third-party-advisory)
- www.antoniobarresi.com/files/cain_advisory.txt (Technical Description, Third Party Advisory)
- www.kb.cert.org/vuls/id/BGAR-A2CNKG (US Government Resource, Third Party Advisory)
- www.kb.cert.org/vuls/id/BLUU-9ZAHZH (US Government Resource, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf (Technical Description, Third Party Advisory)
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.