---
id: CVE-2026-98007
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Reject non-scalar bpf_loop iteration counts

  bpf_loop() declares its nr_loops argument as ARG_ANYTHING
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Reject non-scalar bpf_loop iteration counts

  bpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged
  programs may pass pointer values to such argumen…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= bb124da69c47dd98d69361ec13244ece50bec63e <
    656d40d1ca228ee21a9b3280432479fc9eae75ab
  - >-
    Linux >= bb124da69c47dd98d69361ec13244ece50bec63e <
    e2e1161e03fecff6d2229a81b024337144bfcd97
  - >-
    Linux >= bb124da69c47dd98d69361ec13244ece50bec63e <
    f8ae8275c721334ee50fafdd986fb83294eb941a
  - >-
    Linux >= bb124da69c47dd98d69361ec13244ece50bec63e <
    c3fd8e5fd100f122bad503bdc0e9277219533253
  - Linux bfc5c19b4b48840627af0d0f1c8f4461b276e508
  - Linux >= 6.6.15 < 6.7
  - Linux 6.7
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:28.967'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98007'
references:
  - url: 'https://git.kernel.org/stable/c/656d40d1ca228ee21a9b3280432479fc9eae75ab'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c3fd8e5fd100f122bad503bdc0e9277219533253'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e2e1161e03fecff6d2229a81b024337144bfcd97'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f8ae8275c721334ee50fafdd986fb83294eb941a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.860Z'
---

## Overview

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

bpf: Reject non-scalar bpf_loop iteration counts

bpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged
programs may pass pointer values to such arguments, so check_func_arg()
lets a pointer-valued R1 reach the helper-specific checks.

Since commit bb124da69c47 ("bpf: keep track of max number of bpf_loop
callback iterations"), the verifier marks R1 precise and reads its upper
bound to limit callback simulation. Precision backtracking only accepts
scalar registers, so passing a pointer instead triggers the "backtracking
misuse" verifier warning. Kernels with panic_on_warn enabled subsequently
panic.

Introduce ARG_SCALAR for helper arguments that only accept scalar values
and use it for bpf_loop() nr_loops. Generic helper argument validation then
rejects pointers before loop inlining and precision processing.

## Remediation

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