CVE-2026-45536
Description
A flaw was found in Netty, a network application framework. A local attacker could exploit a vulnerability in the netty_unix_socket_recvFd function when handling SCM_RIGHTS messages in Epoll or KQueue DomainSocketChannel with DomainSocketReadMode.FILE_DESCRIPTORS enabled. Incorrect handling of file descriptors could lead to a resource leak, resulting in a Denial of Service (DoS) due to exhaustion of available file descriptors.
Statement
This Moderate impact flaw in Netty can lead to a denial of service due to file descriptor exhaustion. The vulnerability requires a local attacker and is only exploitable when applications explicitly enable DomainSocketReadMode.FILE_DESCRIPTORS in Epoll or KQueue DomainSocketChannel, which is not a default configuration in Red Hat products. This significantly reduces the attack surface to specific, custom deployments.
Mitigation
To mitigate this issue, ensure that `DomainSocketReadMode.FILE_DESCRIPTORS` is not enabled in applications utilizing Netty's `Epoll` or `KQueue DomainSocketChannel`. This feature is not enabled by default, and disabling it prevents the file descriptor leak that could lead to a Denial of Service.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4 | N/A | 4 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
cve.org: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Understanding the Weakness (CWE)
Integrity
Technical Impact: Unexpected State
Frequently Asked Questions
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