CVE-2021-3483 : Security Advisory and Response
Learn about CVE-2021-3483, a use-after-free flaw in the Nosy driver of the Linux kernel, impacting versions before 5.12-rc6. Understand the impact, technical details, and mitigation steps.
A use-after-free vulnerability was discovered in the Nosy driver in the Linux kernel, allowing for insertion of a device twice into a doubly-linked list, leading to a use-after-free scenario upon device removal. The impact of this vulnerability includes risks to confidentiality, integrity, and system availability in versions before kernel 5.12-rc6.
Understanding CVE-2021-3483
This section delves into the details of the CVE-2021-3483 vulnerability.
What is CVE-2021-3483?
CVE-2021-3483 is a use-after-free flaw in the Nosy driver in the Linux kernel, affecting versions prior to kernel 5.12-rc6. This vulnerability poses a threat to data confidentiality, system integrity, and availability.
The Impact of CVE-2021-3483
The vulnerability could allow a malicious actor to exploit the flaw, resulting in a use-after-free condition. This could potentially lead to the compromise of sensitive information, tampering with data integrity, and disrupting system availability.
Technical Details of CVE-2021-3483
This section provides insights into the technical aspects of the CVE-2021-3483 vulnerability.
Vulnerability Description
The flaw in the Nosy driver allows for the insertion of a device twice into a doubly-linked list, leading to a use-after-free scenario upon device removal.
Affected Systems and Versions
The vulnerability affects versions of the Linux kernel prior to kernel 5.12-rc6.
Exploitation Mechanism
A malicious actor could exploit this vulnerability by manipulating the doubly-linked list to trigger a use-after-free condition.
Mitigation and Prevention
Explore the recommended steps to mitigate and prevent the exploitation of CVE-2021-3483.
Immediate Steps to Take
It is crucial to apply the latest security updates and patches provided by Linux distributions and vendors. Updating to kernel version 5.12-rc6 or newer can mitigate the risk associated with this vulnerability.
Long-Term Security Practices
Regularly monitor security mailing lists and official advisories for any updates related to the Linux kernel vulnerabilities. Employ best security practices to safeguard systems against potential threats.
Patching and Updates
Promptly apply patches and updates released by Linux vendors to address security vulnerabilities like CVE-2021-3483.