Vulnerability in Linux Layer 2 Tunneling Protocol
CVE-2022-4129
A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the system causing a denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (6.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Linux Layer 2 Tunneling Protocol
- Fedoraproject Fedora — versions 35, 36, 37
- Linux Kernel (L2tp) — versions up to v6.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lore.kernel.org/all/20221114191619.124659-1-jakub@cloudflare.com/t
- lore.kernel.org/netdev/20221121085426.21315-1-jakub@cloudflare.com/t
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.debian.org/debian-lts-announce/2023/05/msg00005.html
Frequently asked questions
- What is CVE-2022-4129?
- CVE-2022-4129 is a medium-severity vulnerability in Linux Layer 2 Tunneling Protocol, classified under Improper Locking. CVSS score: 5.5/10. Published 2022-11-28.
- How severe is CVE-2022-4129?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2022-4129 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.