CVE-2026-53292
Description
A flaw was found in the Linux kernel's phonet networking subsystem. A local user could trigger a kernel panic by sending a specially crafted message, leading to a denial of service. This occurs because the pn_socket_autobind() function incorrectly assumes a socket is already bound when pn_socket_bind() returns an -EINVAL error, causing a BUG_ON() assertion to fire.
Statement
Red Hat rates the security impact of this vulnerability as Moderate because exploitation requires local access and can only trigger a system denial of service, without risk to data confidentiality or integrity. The condition occurs when socket transmission triggers an assertion failure within the phonet protocol handling routines. Phonet is a legacy cellular communications stack not utilized in standard enterprise deployments, and supported Red Hat Enterprise Linux releases do not include the vulnerable code.
Common Vulnerability Scoring System (CVSS) Score Details
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).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
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
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