SB2016112805 - Permissions, Privileges, and Access Controls in Linux kernel
Published: November 28, 2016 Updated: August 9, 2020
Security Bulletin ID
SB2016112805
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2016-9644)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
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.
Remediation
Install update from vendor's website.