CVE-2017-18218 : Security Advisory and Response
Learn about CVE-2017-18218, a Linux kernel vulnerability allowing local users to trigger denial of service attacks by exploiting skb handling differences. Find mitigation steps here.
The Linux kernel prior to version 4.13 is vulnerable to a denial of service (DoS) attack and potential unspecified consequences caused by local users exploiting variations in skb handling.
Understanding CVE-2017-18218
What is CVE-2017-18218?
This CVE refers to a vulnerability in the Linux kernel before version 4.13 that allows local users to trigger a denial of service attack and potentially other impacts by manipulating skb handling.
The Impact of CVE-2017-18218
The vulnerability can lead to a use-after-free scenario and potential system bugs when certain skb handling differences are exploited by local users.
Technical Details of CVE-2017-18218
Vulnerability Description
In the Linux kernel before version 4.13, local users can exploit discrepancies in skb handling to cause a denial of service (DoS) or other unspecified impacts.
Affected Systems and Versions
- Affected System: Linux kernel before version 4.13
- Affected Versions: Not specified
Exploitation Mechanism
- Local users manipulate skb handling differences between hns_nic_net_xmit_hw and hns_nic_net_xmit
Mitigation and Prevention
Immediate Steps to Take
- Update the Linux kernel to version 4.13 or newer
- Monitor and restrict local user privileges to minimize potential exploitation
Long-Term Security Practices
- Regularly update and patch the Linux kernel to address known vulnerabilities
- Implement proper access controls and user permissions to limit system exposure
Patching and Updates
- Apply patches provided by the Linux kernel maintainers to fix the vulnerability