---
id: "CVE-2026-128885"
page: "https://infrastack.ai/live/CVE-2026-128885"
kind: "vulnerability"
aliases: ["CVE-2026-128885"]
title: "D-Bus: fd overflow in select() fallback lets local users crash daemon"
severity: "medium"
cvss: 5.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["dbus", "infrastructure", "linux", "local-users"]
not_affected_if: ["default-config", "no-local-untrusted-users"]
published_at: "2026-11-13T21:17:45+00:00"
first_seen_at: "2026-11-13T21:33:41+00:00"
updated_at: "2026-11-13T21:33:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128885", "first_seen_at": "2026-11-13T21:33:41+00:00"}]
exploit_sources: []
---

# D-Bus: fd overflow in select() fallback lets local users crash daemon

Link for people: https://infrastack.ai/live/CVE-2026-128885 (this .md is for agents)

In D-Bus builds that fall back to the Unix select() event loop, the daemon does not check whether file descriptor numbers exceed the allocated limit. A local attacker who opens many concurrent connections can trigger an out-of-bounds stack write that crashes the daemon.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-11-13T21:33:41+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-128885

## From the sources

A flaw was found in D-Bus. In configurations where the daemon falls back to using the Unix select() mechanism for event monitoring, it does not verify whether file descriptor numbers exceed allocated limits. A local attacker can exploit this flaw by opening a large number of concurrent connections to trigger an out-of-bounds write on the stack. This can cause the daemon to crash, resulting in a Denial of Service (DoS).

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