Is CVE-2015-2877 being actively exploited?

CVE-2015-2877 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2015-2877?

CVE-2015-2877 has a CVSS 3.1 base score of 3.3 (LOW).

CVE-2015-2877

LOW · CVSS 3.3EPSS 0.9%EU EUVD

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

Key facts

CVSS score: 3.3 (v3.1)
Severity: LOW
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-200
EPSS score: 0.9% (60th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2015-2965)
Published: March 3, 2017
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2015-2965 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

linux / linux kernel
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux

Certified products that may be affected

14 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux Kernel Crypto API Cryptographic Module v4.0 with CPACF - Red Hat®, Inc. - FIPS 140 2798 - historical
Red Hat Enterprise Linux Kernel Crypto API Cryptographic Module v4.0 - Red Hat®, Inc. - FIPS 140 2742 - historical
Red Hat Enterprise Linux Libreswan Cryptographic Module v4.0 - Red Hat®, Inc. - FIPS 140 2721 - historical
Red Hat Enterprise Linux NSS Cryptographic Module v4.0 - Red Hat®, Inc. - FIPS 140 2711 - historical
Red Hat Enterprise Linux libgcrypt Cryptographic Module v4.0 [1] and Red Hat Enterprise Linux libgcrypt Cryptographic Module v5.0 [2] - Red Hat®, Inc. - FIPS 140 2657 - historical

See all 14 in the Security Certifications Explorer.

References

http://www.antoniobarresi.com/files/cain_advisory.txt(Technical Description, Third Party Advisory)
http://www.kb.cert.org/vuls/id/935424(Third Party Advisory, US Government Resource)
http://www.securityfocus.com/bid/76256(Third Party Advisory, VDB Entry)
https://bugzilla.redhat.com/show_bug.cgi?id=1252096(Issue Tracking, Third Party Advisory)
https://www.kb.cert.org/vuls/id/BGAR-A2CNKG(Third Party Advisory, US Government Resource)
https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH(Third Party Advisory, US Government Resource)
https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf(Technical Description, Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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