CVE-2015-2877

LOWNVD 3.33.3—
EchelonGraph scoreMEDIUM confidence

Score 3.3 from GitHub Security Advisory (severity: LOW) published 2022-05-13. NVD baseline CVSS 3.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
3.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 3.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
3.3
EG Score
3.3(medium)
EG Risk
20(Track)
EG Risk 20/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity33% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
57.3%
KEV
Not listed

Published

March 3, 2017

Last Modified

May 13, 2026

References (14)

Data Freshness Timeline

(refreshed 14× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 103 total refreshes for this CVE.

  1. 2026-07-24 14:13 UTCEPSS rescore
  2. 2026-07-23 14:14 UTCEPSS rescore
  3. 2026-07-23 01:17 UTCEG score recompute
  4. 2026-07-23 00:19 UTCEG score recompute
  5. 2026-07-22 21:58 UTCEG score recompute
  6. 2026-07-22 14:04 UTCEPSS rescore
  7. 2026-07-21 15:21 UTCEPSS rescore
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  20. 2026-07-13 22:26 UTCEPSS rescore
  21. 2026-07-12 05:42 UTCEPSS rescore
  22. 2026-07-12 02:41 UTCOSV refresh
  23. 2026-07-11 08:23 UTCEPSS rescore
  24. 2026-07-09 19:05 UTCEPSS rescore
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  1. 2026-07-07 13:42 UTCEPSS rescore
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  20. 2026-06-23 09:00 UTCOSV refresh
  21. 2026-06-22 14:23 UTCEPSS rescore
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  26. 2026-06-19 19:23 UTCEPSS rescore
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  40. 2026-06-07 15:22 UTCEPSS rescore
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  42. 2026-06-06 08:33 UTCOSV refresh
  43. 2026-06-05 22:44 UTCEPSS rescore
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  65. 2026-05-24 16:43 UTCEPSS rescore
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  67. 2026-05-22 21:15 UTCEPSS rescore
  68. 2026-05-22 21:15 UTCEPSS rescore
  69. 2026-05-22 15:46 UTCEG score recompute
  70. 2026-05-22 15:46 UTCGHSA enrichment
  71. 2026-05-21 22:40 UTCEPSS rescore
  72. 2026-05-20 22:37 UTCEPSS rescore
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  74. 2026-05-20 11:21 UTCEPSS rescore
  75. 2026-05-20 11:21 UTCEPSS rescore

Frequently asked(5)

What is CVE-2015-2877?
CVE-2015-2877 is a low vulnerability published on March 3, 2017. 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…
When was CVE-2015-2877 disclosed?
CVE-2015-2877 was first published in the National Vulnerability Database on March 3, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-2877 actively exploited?
CVE-2015-2877 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 57.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-2877?
CVE-2015-2877 has a CVSS v3 base score of 3.3 (NVD).
How do I remediate CVE-2015-2877?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-2877, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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