---
id: CVE-2026-90177
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Check pointer type for all atomic RMW paths

  Atomic RMW verification records an instruction pointer type only when the
  current destination is PTR_TO_ARENA
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Check pointer type for all atomic RMW paths

  Atomic RMW verification records an instruction pointer type only when the
  current destination is PTR_TO_ARENA. A secon…
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 >= d503a04f8bc0c75dc9db9452d8cc79d748afb752 <
    eb287c6e81dedef92da01eb947f380d0aae513c3
  - >-
    Linux >= d503a04f8bc0c75dc9db9452d8cc79d748afb752 <
    4bc49ae344d65cfcef738f281ac575cf73ca2fc5
  - Linux 6.10
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:45.693'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90177'
references:
  - url: 'https://git.kernel.org/stable/c/4bc49ae344d65cfcef738f281ac575cf73ca2fc5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eb287c6e81dedef92da01eb947f380d0aae513c3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00154
epssPercentile: 0.04906
ingestedAt: '2026-09-17T16:21:47.867Z'
---

## Overview

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

bpf: Check pointer type for all atomic RMW paths

Atomic RMW verification records an instruction pointer type only when the
current destination is PTR_TO_ARENA. A second path can therefore reach the
same instruction with an ordinary pointer without comparing it against the
saved arena type.

The post-verification fixup uses the saved type to rewrite the instruction
to BPF_PROBE_ATOMIC for every path. Record the actual destination type for
all atomic RMW paths so the existing mismatch check rejects incompatible
uses of one instruction.

## Remediation

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