---
id: CVE-2026-93044
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Disallow interpreter fallback for arena-related insns

  Since the interpreter does not support the arena-related insns,
  interpreter fallback should not be allowed f…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Disallow interpreter fallback for arena-related insns

  Since the interpreter does not support the arena-related insns,
  interpreter fallback should not be allowed f…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 6082b6c328b5486da2b356eae94b8b83c98b5565 <
    408b6d3bc19c4aa852ab7ee2f447756e52e69967
  - >-
    Linux >= 6082b6c328b5486da2b356eae94b8b83c98b5565 <
    34746b5a84ec37c0ea2bf6808c65c5ed8790eb51
  - Linux 6.9
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:57.643'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93044'
references:
  - url: 'https://git.kernel.org/stable/c/34746b5a84ec37c0ea2bf6808c65c5ed8790eb51'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/408b6d3bc19c4aa852ab7ee2f447756e52e69967'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93044.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93044'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536525'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93044'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93044'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93044.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-17T16:21:47.772Z'
epss: 0.00198
epssPercentile: 0.09453
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-843
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

bpf: Disallow interpreter fallback for arena-related insns

Since the interpreter does not support the arena-related insns,
interpreter fallback should not be allowed for these insns in
core.c::__bpf_prog_select_runtime().

Currently, when the interpreter executes the arena ST/LDX/STX insns,
it would hit the BUG_ON() in ___bpf_prog_run() at run time.

[    2.579196] BPF interpreter: unknown opcode a2 (imm: 0x0)
[    2.579998] ------------[ cut here ]------------
[    2.580652] kernel BUG at kernel/bpf/core.c:2349!
[    2.581314] Oops: invalid opcode: 0000 [#1] SMP PTI

Set jit_required as true when arena map is used in the prog to disallow
interpreter fallback for arena-related insns.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93044.json)