A vulnerability (CVE-2021-47029) has been identified and resolved in the Linux kernel. It is associated with the mt76_connac module and may cause a kernel warning when adding a monitor interface in the mt76_connac_mcu_uni_add_dev routine. This post discusses the details, including code snippets and links to references, of this vulnerability and its fix.
Problem Description
The issue stems from a bug in the Linux kernel leading to a kernel warning when adding a monitor interface in the mt76_connac_mcu_uni_add_dev routine with the mt76 connac library.
Code Snippet showing the kernel warning
[ 507.984882] ------------[ cut here ]------------
[ 507.989515] WARNING: CPU: 1 PID: 3017 at mt76_connac_mcu_uni_add_dev+x178/x190 [mt76_connac_lib]
...
[ 508.253465] ---[ end trace c7b90fee13d72c39 ]---
[ 508.261278] ------------[ cut here ]------------
Solution
The vulnerability has been fixed in the recent Linux kernel releases. The fix is applied in the mt76_connac_mcu_uni_add_dev function within the mt76_connac_lib module. Users running an affected kernel version are advised to update to the latest patched version to resolve this vulnerability.
Links to Original References
1. Linux Kernel Commit Fixing Vulnerability: Link
2. CVE Details: Link
Exploit Details
CVE-2021-47029 has not been widely exploited, and no known public exploits are available at the time of writing this post. The kernel warning itself does not result in a direct compromise of the system but may possibly lead to a denial of service (DoS) condition if the warning occurs frequently enough and is not gracefully handled.
Conclusion
Users are encouraged to update their Linux kernel to the latest patched version to avoid potential issues related to the CVE-2021-47029 vulnerability. Keep your system up-to-date and secure by applying the latest security patches and following the best security practices.
If you found this information helpful, be sure to share it with others to spread awareness of Linux kernel vulnerabilities and their fixes. Stay up-to-date with the latest patches to keep your systems secure, and stay tuned for more informative posts on cybersecurity.
Timeline
Published on: 02/28/2024 09:15:39 UTC
Last modified on: 02/28/2024 14:06:45 UTC