Is CVE-2015-8539 in the CISA KEV catalog?

No. CVE-2015-8539 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-8539?

CVE-2015-8539 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2015-8539?

CVE-2015-8539 has an EPSS score of 0.43% (34th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-8539?

Upgrade linux on ubuntu 14.04 to 3.13.0-161.211 or later. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2015-8539

HIGH

7.8

CVSS v3

NVD

Description

The KEYS subsystem in the Linux kernel before 4.4 allows local users to gain privileges or cause a denial of service (BUG) via crafted keyctl commands that negatively instantiate a key, related to security/keys/encrypted-keys/encrypted.c, security/keys/trusted.c, and security/keys/user_defined.c.

CWE-269Improper Privilege Management

How to fix

Remediation Available

linuxUbuntu

Fixed in:3.13.0-161.211USN-3798-1

linux-image-3.13.0-161-genericUbuntu

Fixed in:3.13.0-161.211USN-3798-1

linux-image-3.13.0-161-generic-lpaeUbuntu

Fixed in:3.13.0-161.211USN-3798-1

linux-image-3.13.0-161-lowlatencyUbuntu

Fixed in:3.13.0-161.211USN-3798-1

linux-image-3.13.0-161-powerpc-e500Ubuntu

Fixed in:3.13.0-161.211USN-3798-1

linux-image-3.13.0-161-powerpc-e500mcUbuntu

Fixed in:3.13.0-161.211USN-3798-1

linux-image-3.13.0-161-powerpc-smpUbuntu

Fixed in:3.13.0-161.211USN-3798-1

linux-image-3.13.0-161-powerpc64-embUbuntu

Fixed in:3.13.0-161.211USN-3798-1

linux-image-3.13.0-161-powerpc64-smpUbuntu

Fixed in:3.13.0-161.211USN-3798-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.43%probability of exploitation in 30 days

34thpercentile

Low risk: more likely to be exploited than 34% of all known CVEs.

References

Related Vulnerabilities

Other CWE-269 (Improper Privilege Management) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12635	Critical	9.8	100%	-	Fix
CVE-2022-24637	Critical	9.8	99%	-	Fix
CVE-2017-5689	Critical	9.8	92%	KEV	Fix
CVE-2020-3243	Critical	9.8	88%	-	-
CVE-2024-21888	High	8.8	87%	-	-
CVE-2022-0441	Critical	9.8	85%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.