CVE catalog
CVE-2023-53020
linux: CVE-2023-53020
- Severity
- Medium · CVSS 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.14% · Oct 25, 2026
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().
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | linux | sid | 7.2.12-1 | fixed |
| Debian | linux | forky | 7.2.12-1 | fixed |
| Debian | linux | trixie | 6.12.107-1 | fixed |
| Debian | linux | trixie-security | 6.12.113-1 | fixed |
| Debian | linux | bookworm | 6.1.176-1 | fixed |
| Debian | linux | bookworm-security | 6.1.190-1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | linux | source | sid | 6.1.11-1 | not yet assigned | Not reported | Not reported |
| Debian | linux | source | forky | 6.1.11-1 | not yet assigned | Not reported | Not reported |
| Debian | linux | source | trixie | 6.1.11-1 | not yet assigned | Not reported | Not reported |
| Debian | linux | source | bookworm | 6.1.11-1 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2025_02846-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2023-53020]
- [https://security-tracker.debian.org/tracker/CVE-2023-53020]
- [https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53020.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2025/wid-sec-w-2025-0649.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]