---
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'
cwe:
  - CWE-1220
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 282de143ead96a5d53331e946f31c977b4610a74 <
    19d5566b84ca1af0256d0d0003e1a081580c3ba3
  - >-
    Linux >= 282de143ead96a5d53331e946f31c977b4610a74 <
    ac65c710cc643cbc52b899627577357867249530
  - Linux 6.2
published: '2026-09-17'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:18:05.997'
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/644cf4e77c2770d4246f6d12f99bc80d253b0ec6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ac65c710cc643cbc52b899627577357867249530'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93144.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93144'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536785'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93144'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93144'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93144.mbox
  - url: 'https://git.kernel.org/stable/c/56f92fecd80419567288b7972caa90107033836e'
  - url: 'https://git.kernel.org/stable/c/c4dc883447ae38c4e22a29cc016046fa65d88994'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00184
epssPercentile: 0.07894
scores:
  nvd: 7.8
  vendor: 6.4
  cna: 7.8
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.

## Vendor advisories

- **Red Hat VEX** · Important · 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 2026-09-30 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93144.json)