---
id: CVE-2026-98800
title: >-
  kernel: kernel: Denial of Service via use-after-free in BPF trampoline
  (CVE-2026-98800)
summary: >-
  A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem.
  When a BPF program attached to a trampoline is detached, the kernel may
  release the program's memory prematurely before preempted tasks have safely
  completed ex…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-416
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
published: '2026-10-18'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T01:25:07+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98800.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98800.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98800'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555072'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98800'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98800'
  - url: 'https://git.kernel.org/stable/c/0fb5751a6e411b1b466c06e50021818d9391df98'
  - url: 'https://git.kernel.org/stable/c/40955f6512a03f0e046f5256b0706b26ba191018'
  - url: 'https://kernelcve.org/list/?q=CVE-2026-98800'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00155
epssPercentile: 0.0462
ingestedAt: '2026-10-18T16:47:32.482Z'
---

## Overview

A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. When a BPF program attached to a trampoline is detached, the kernel may release the program's memory prematurely before preempted tasks have safely completed execution. A local user can exploit this race condition to access freed memory, resulting in a kernel crash and Denial of Service (DoS) or potential memory corruption.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98800.json)

**kernel: kernel: Denial of Service via use-after-free in BPF trampoline** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-21.

Affected:

- Red Hat Enterprise Linux 10

No fix planned:

- Red Hat Enterprise Linux 10

## Remediation

Fix deferred

Workarounds / mitigations:

- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.