CVE - CVE-2023-53020

CVE-ID
CVE-2023-53020	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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().
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0b2c59720e65885a394a017d0cf9cab118914682 URL:https://git.kernel.org/stable/c/0b2c59720e65885a394a017d0cf9cab118914682 MISC:https://git.kernel.org/stable/c/2d77e5c0ad79004b5ef901895437e9cce6dfcc7e URL:https://git.kernel.org/stable/c/2d77e5c0ad79004b5ef901895437e9cce6dfcc7e MISC:https://git.kernel.org/stable/c/77e8ed776cdb1a24b2aab8fe7c6f1f154235e1ce URL:https://git.kernel.org/stable/c/77e8ed776cdb1a24b2aab8fe7c6f1f154235e1ce MISC:https://git.kernel.org/stable/c/cef0845b6dcfa2f6c2c832e7f9622551456c741d URL:https://git.kernel.org/stable/c/cef0845b6dcfa2f6c2c832e7f9622551456c741d
Assigning CNA
kernel.org
Date Record Created
20250327	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250327)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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