CVE & CISA-KEV Catalog

CVE-2016-9644

HIGHEPSS 70th pctl
7.8
CVSS v3
NVD

Description

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows local users to obtain root access on non-SMEP platforms via a crafted application. NOTE: this vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch to older kernels.

CWE-264Permissions, Privileges, and Access Controls

How to fix

Remediation Available
linuxUbuntu
Fixed in:4.4.0-51.72USN-3146-1
linux-image-4.4.0-1042-snapdragonUbuntu
Fixed in:4.4.0-1042.46USN-3161-4
linux-image-4.4.0-51-genericUbuntu
Fixed in:4.4.0-51.72~14.04.1USN-3146-2
Fixed in:4.4.0-51.72USN-3146-1
linux-image-4.4.0-51-generic-lpaeUbuntu
Fixed in:4.4.0-51.72~14.04.1USN-3146-2
Fixed in:4.4.0-51.72USN-3146-1
linux-image-4.4.0-51-lowlatencyUbuntu
Fixed in:4.4.0-51.72~14.04.1USN-3146-2
Fixed in:4.4.0-51.72USN-3146-1
linux-image-4.4.0-51-powerpc-e500mcUbuntu
Fixed in:4.4.0-51.72~14.04.1USN-3146-2
Fixed in:4.4.0-51.72USN-3146-1
linux-image-4.4.0-51-powerpc-smpUbuntu
Fixed in:4.4.0-51.72~14.04.1USN-3146-2
Fixed in:4.4.0-51.72USN-3146-1
linux-image-4.4.0-51-powerpc64-embUbuntu
Fixed in:4.4.0-51.72~14.04.1USN-3146-2
Fixed in:4.4.0-51.72USN-3146-1
linux-image-4.4.0-51-powerpc64-smpUbuntu
Fixed in:4.4.0-51.72~14.04.1USN-3146-2
Fixed in:4.4.0-51.72USN-3146-1
linux-lts-xenialUbuntu
Fixed in:4.4.0-51.72~14.04.1USN-3146-2
linux-snapdragonUbuntu
Fixed in:4.4.0-1042.46USN-3161-4

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 RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

1.45%probability of exploitation in 30 days
70thpercentile

Elevated risk: more likely to be exploited than 70% of all known CVEs.

References

Third-Party Advisory1
Product1

Related Vulnerabilities

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2012-1456Medium4.3100%--
CVE-2012-1459Medium4.3100%-Fix
CVE-2012-1446Medium4.3100%--
CVE-2012-1443Medium4.3100%--
CVE-2012-1442Medium4.399%--
CVE-2012-1457Medium4.398%-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.