CVE-2020-11935 : What You Need to Know
CVE-2020-11935 involves aufs mishandling inode reference counts in Linux kernel, allowing local attackers to launch denial of service attacks. Learn about impacts, affected systems, and mitigation steps.
This CVE involves aufs improperly managing inode reference counts in the vfsub_dentry_open() method, potentially leading to a denial of service attack.
Understanding CVE-2020-11935
This vulnerability was discovered in the Linux kernel's aufs implementation.
What is CVE-2020-11935?
The issue arises from aufs mishandling inode reference counts in the vfsub_dentry_open() method, allowing a local attacker to exploit it for a denial of service attack.
The Impact of CVE-2020-11935
The vulnerability could result in a denial of service attack, affecting the availability of the system.
Technical Details of CVE-2020-11935
This section delves into the technical aspects of the CVE.
Vulnerability Description
The vulnerability stems from aufs improperly managing inode reference counts in the vfsub_dentry_open() method.
Affected Systems and Versions
- Vendor: Ubuntu
- Product: Linux kernel (aufs filesystem module)
- Versions:
- 4.4.0-186.216 (unaffected)
- 4.15.0-112.113 (unaffected)
- 5.4.0-42.46 (unaffected)
Exploitation Mechanism
- Attack Vector: Local
- Attack Complexity: Low
- Privileges Required: High
- User Interaction: None
- Scope: Unchanged
- Impact: High availability impact
- Base Score: 4.4 (Medium severity)
Mitigation and Prevention
Steps to address and prevent the CVE.
Immediate Steps to Take
- Monitor vendor advisories for patches
- Apply relevant security updates promptly
Long-Term Security Practices
- Regularly update and patch systems
- Implement least privilege access controls
Patching and Updates
- Apply patches provided by Ubuntu for the affected versions