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CVE-2016-9644

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Date: November 27, 2016

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.

Language: C

Severity Score

Related Resources (8)

http://www.ubuntu.com/usn/USN-3146-2
http://www.ubuntu.com/usn/USN-3146-1
http://www.securityfocus.com/bid/94545
https://nvd.nist.gov/vuln/detail/CVE-2016-9644
https://lwn.net/Articles/705220/
http://www.openwall.com/lists/oss-security/2016/11/07/4
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-9644
https://www.mend.io/vulnerability-database/CVE-2016-9644

Severity Score

Weakness Type (CWE)

Permissions, Privileges, and Access Control

CWE-264

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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