---
id: CVE-2026-98595
title: >-
  kernel: udp: remove a disconnected socket from the 4-tuple hash table
  (CVE-2026-98595)
summary: >-
  A flaw was found in the Linux kernel's UDP networking subsystem. When a
  connected User Datagram Protocol (UDP) socket bound to a specific address is
  disconnected, the kernel fails to remove the socket entry from its internal
  connection loo…
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cvssSource: vendor
cwe: CWE-459
vendor: Red Hat
product: Red Hat Enterprise Linux 6
affected:
  - enterprise_linux 6
published: '2026-10-18'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T04:55:17+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98595.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98595.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98595'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554968'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98595'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98595'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98595.mbox
  - url: 'https://git.kernel.org/stable/c/c21daf37d5ce9a4e234b7c42238ac1e6041e28e4'
  - url: 'https://git.kernel.org/stable/c/d1b5fd969cc53f29d02b82b05a45135de4a6087a'
  - url: 'https://git.kernel.org/stable/c/9e95b1a94c9c49b4ba722251bbca2759b9c51737'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00198
epssPercentile: 0.09465
ingestedAt: '2026-10-18T15:45:12.247Z'
---

## Overview

A flaw was found in the Linux kernel's UDP networking subsystem. When a connected User Datagram Protocol (UDP) socket bound to a specific address is disconnected, the kernel fails to remove the socket entry from its internal connection lookup table. A local user can cause stale entries to persist, potentially allowing incoming network packets from former peers to be improperly matched and delivered, or causing degraded network processing performance.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98595.json)

**kernel: udp: remove a disconnected socket from the 4-tuple hash table** — rated Low by Red Hat. Released 2026-10-18, updated 2026-10-20.

Affected:

- Red Hat Enterprise Linux 6

No fix planned:

- Red Hat Enterprise Linux 6

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope