---
id: CVE-2026-98019
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: mark a NULL call argument precise

  check_func_arg() allows bpf_register_is_null() for nullable arguments
  w/o marking the underlying scalar register precise
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: mark a NULL call argument precise

  check_func_arg() allows bpf_register_is_null() for nullable arguments
  w/o marking the underlying scalar register precise. Hence …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b5dc0163d8fd78e64a7e21f309cf932fda34353e <
    69a9ad004ccf5d45e534c7d503f47f643abe64b7
  - >-
    Linux >= b5dc0163d8fd78e64a7e21f309cf932fda34353e <
    1a3a10b030c96ea88868ccc060a16827c01eaa5a
  - Linux 5.3
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:30.363'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98019'
references:
  - url: 'https://git.kernel.org/stable/c/1a3a10b030c96ea88868ccc060a16827c01eaa5a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/69a9ad004ccf5d45e534c7d503f47f643abe64b7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.856Z'
---

## Overview

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

bpf: mark a NULL call argument precise

check_func_arg() allows bpf_register_is_null() for nullable arguments
w/o marking the underlying scalar register precise. Hence a checkpoint
created on such a path would prune against arbitrary scalar value.

check_helper_call() enforces second parameter of the
bpf_get_local_storage() to be zero, w/o marking the underlying scalar
register precise. Hence a checkpoint created on such a path would
prune against arbitrary scalar value.

Grouping these two into one patch, as they share the same fixes tag.

## Remediation

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