CVE-2026-23286
Description
A flaw was found in the Linux kernel's ATM LANE (LAN Emulation) module. When an Asynchronous Transfer Mode Virtual Channel Connection (atm_vcc) is shared across multiple entries, a vulnerability in the lec_arp_clear_vccs function can lead to a null-pointer dereference. This occurs when the function attempts to access a previously freed data structure, resulting in a system crash and a Denial of Service (DoS).
Déclaration
This flaw affects systems using ATM LANE (LAN Emulation over ATM), which is legacy networking technology rarely used in modern deployments. The NULL pointer dereference occurs when iterating over shared VCC entries during cleanup. While the impact is a kernel crash, ATM LANE is uncommon in current enterprise environments.
Mesure d'atténuation
To mitigate this issue, prevent the lec module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.
Détails du score du système commun d'évaluation des vulnérabilités (CVSS)
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
Les mesures et les scores CVSS suivants sont préliminaires et sujets à révision.
Répartition des scores CVSS v3
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Score de base | 5.5 | 5.5 | N/A |
| Vecteur d'attaque | Local | Local | N/A |
| Complexité de l'attaque | Low | Low | N/A |
| Privilèges requis | Low | Low | N/A |
| Interaction avec l'utilisateur | None | None | N/A |
| Champ d'application | Unchanged | Unchanged | N/A |
| Confidentialité | None | None | N/A |
| Impact sur l'intégrité | None | None | N/A |
| Impact sur la disponibilité | High | High | N/A |
Vecteur
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Comprendre la Défaillance (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart
NULL pointer dereferences usually result in the failure of the process unless exception handling (on some platforms) is available and implemented. Even when exception handling is being used, it can still be very difficult to return the software to a safe state of operation.
Integrity,Confidentiality
Technical Impact: Execute Unauthorized Code or Commands; Read Memory; Modify Memory
In rare circumstances, when NULL is equivalent to the 0x0 memory address and privileged code can access it, then writing or reading memory is possible, which may lead to code execution.
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