---
id: CVE-2026-93144
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Reject writes through untrusted BTF pointers

  check_ptr_to_btf_access() lets program-type btf_struct_access callbacks
  validate writes before the default BTF access…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Reject writes through untrusted BTF pointers

  check_ptr_to_btf_access() lets program-type btf_struct_access callbacks
  validate writes before the default BTF access…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 282de143ead96a5d53331e946f31c977b4610a74 <
    19d5566b84ca1af0256d0d0003e1a081580c3ba3
  - >-
    Linux >= 282de143ead96a5d53331e946f31c977b4610a74 <
    ac65c710cc643cbc52b899627577357867249530
  - Linux 6.2
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:18:22.530'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93144'
references:
  - url: 'https://git.kernel.org/stable/c/19d5566b84ca1af0256d0d0003e1a081580c3ba3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ac65c710cc643cbc52b899627577357867249530'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00175
epssPercentile: 0.06292
ingestedAt: '2026-09-17T16:21:47.743Z'
---

## Overview

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

bpf: Reject writes through untrusted BTF pointers

check_ptr_to_btf_access() lets program-type btf_struct_access callbacks
validate writes before the default BTF access path rejects non-read
accesses. That bypasses the read-only policy for untrusted BTF pointers
created by helpers such as bpf_rdonly_cast().

Reject non-read accesses through PTR_UNTRUSTED BTF pointers at the
common entry point, before the callback branch to handle all cases.

## Remediation

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