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CVE-2022-4129

MEDIUM
5.5
CVSS Score
Published: November 28, 2022 at 12:00 AM UTC
Updated: October 14, 2026 at 02:17 PM UTC
4 products affected across 3 vendorsFedoraLayer 2 Tunneling ProtocolLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
353637
Layer 2 Tunneling Protocol· Linux
95%
v < 6.0
Affected range stops below 6.0, so it looks safe — our inference, not a vendor statement
Linux Kernel· Linux
62%
All versions
Kernel· Red Hat
60%
v ≤ 6.0

References (7)

Source: [email protected]
https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7X5SPXMXXFANDASPCKER2JIQO2F3UHCP/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AM5KFIE6JNZXHBA5A2KYDZAT3MEX2B67/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JOKXNIM2R4FQCDRQV67UMAY6EBC72QFG/
Source: [email protected]
https://lore.kernel.org/all/20221114191619.124659-1-jakub%40cloudflare.com/t
Source: [email protected]
https://lore.kernel.org/netdev/20221121085426.21315-1-jakub%40cloudflare.com/t
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-794697.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-667

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