Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: l2tp: close all race conditions in l2tp_tunnel_register() The code in l2tp_tunnel_register() is racy in several ways: 1. It modifies the tunnel socket _after_ publishing it. 2. It calls setup_udp_tunnel_sock() on an existing socket without locking. 3. It changes sock lock class on fly, which triggers many syzbot reports. This patch amends all of them by moving socket initialization code before publishing and under sock lock. As suggested by Jakub, the l2tp lockdep class is not necessary as we can just switch to bh_lock_sock_nested().
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.6, < 5.10.166 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0b2c59720e65885a394a017d0cf9cab118914682Patch
- https://git.kernel.org/stable/c/2d77e5c0ad79004b5ef901895437e9cce6dfcc7ePatch
- https://git.kernel.org/stable/c/77e8ed776cdb1a24b2aab8fe7c6f1f154235e1cePatch
- https://git.kernel.org/stable/c/cef0845b6dcfa2f6c2c832e7f9622551456c741dPatch
FAQ
What is CVE-2023-53020?
CVE-2023-53020 is a vulnerability with a CVSS score of 4.7 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: l2tp: close all race conditions in l2tp_tunnel_register() The code in l2tp_tunnel_register() is racy in several ways: 1. It modif...
How severe is CVE-2023-53020?
CVE-2023-53020 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-53020?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.