Information Exposure Affecting xen package, versions <4.8.3+xsa262+shim4.10.0+comet3-1+deb9u7


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

Exploit Maturity
Proof of Concept
EPSS
60.63% (100th percentile)

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  • Snyk IDSNYK-ECHOLATEST-XEN-18388704
  • published29 Jul 2026
  • disclosed22 May 2018

Introduced: 22 May 2018

CVE-2018-3639  (opens in a new tab)
CWE-203  (opens in a new tab)

How to fix?

Upgrade Echo:latest xen to version 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB), Variant 4.

References

CVSS Base Scores

version 3.1