---
id: CVE-2026-98547
title: >-
  kernel: af_packet: fix integer overflow in prb_calc_retire_blk_tmo()
  (CVE-2026-98547)
summary: >-
  A flaw was found in the Linux kernel's af_packet network socket
  implementation. An integer overflow occurs during timeout calculations when
  configuring packet receive rings with large block sizes. A local user with raw
  network privileges c…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-190
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T23:55:32+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98547.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98547.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98547'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554940'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98547'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98547'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98547.mbox
  - url: 'https://git.kernel.org/stable/c/02afd75649a4e001031ed82153a5c39312ec0737'
  - url: 'https://git.kernel.org/stable/c/eb5b3838b9200dac04bfe33483db0ee8287456fb'
  - url: 'https://git.kernel.org/stable/c/297acc571d5813db76b147c745b91031d5f9c960'
  - url: 'https://git.kernel.org/stable/c/be1aacff399d519cc48d6b34354a54dd79041140'
  - url: 'https://git.kernel.org/stable/c/b2bcc6a254d6f27823a56787668ae4ee8cdb6e71'
  - url: 'https://git.kernel.org/stable/c/6279211e7d2456ecd195d236c9ee5e5c6fa5a17a'
  - url: 'https://git.kernel.org/stable/c/218a944b9e035d4b47d59c69af6ca13319da15fb'
  - url: 'https://git.kernel.org/stable/c/56d82862a0a243ac14ba11b6d7b57ddc2d064b95'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00216
epssPercentile: 0.11984
ingestedAt: '2026-10-18T15:45:12.266Z'
---

## Overview

A flaw was found in the Linux kernel's af_packet network socket implementation. An integer overflow occurs during timeout calculations when configuring packet receive rings with large block sizes. A local user with raw network privileges can exploit this vulnerability by setting an oversized socket buffer size, triggering a continuous, high-frequency timer loop. This condition locks CPU resources and can freeze the system, resulting in a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98547.json)

**kernel: af_packet: fix integer overflow in prb_calc_retire_blk_tmo()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-19.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- 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