SB2017120204 - Use-after-free in Linux Kernel

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Main Vulnerability Database SB2017120204

SB2017120204 - Use-after-free in Linux Kernel

Published: December 2, 2017

Security Bulletin ID SB2017120204
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2017-17053)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to execute arbitrary code on the target system with elevated privileges.

The vulnerability exists due to use-after-free error within the init_new_context() function in arch/x86/include/asm/mmu_context.h in the Linux kernel before 4.12.10 when handling errors in LDT table allocation during forking of a new process. A local user can execute a specially crafted application and execute arbitrary code on the system with escalated privileges.

This vulnerability only affected kernels built with "CONFIG_MODIFY_LDT_SYSCALL" set to "Y".



Remediation

Install update from vendor's website.

References