---
id: CVE-2026-92515
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Preserve unique-field state across nested structs

  btf_find_struct_field() initializes a fresh seen mask for every recursive
  descent
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Preserve unique-field state across nested structs

  btf_find_struct_field() initializes a fresh seen mask for every recursive
  descent. Unique special fields in diff…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 64e8ee814819f21beeeda00d4119221443d77992 <
    cec97102d4147e18568c93946014c4c8ebf86fcf
  - >-
    Linux >= 64e8ee814819f21beeeda00d4119221443d77992 <
    28d5f20ed022ade0fb0bfbf50b78fec782083175
  - >-
    Linux >= 64e8ee814819f21beeeda00d4119221443d77992 <
    373a1e9366e711b89bc5e45bd6edf33ef62402cd
  - >-
    Linux >= 64e8ee814819f21beeeda00d4119221443d77992 <
    f08619f060468076e4acbdc10e0713af20d60e65
  - Linux 6.11
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:54.360'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92515'
references:
  - url: 'https://git.kernel.org/stable/c/28d5f20ed022ade0fb0bfbf50b78fec782083175'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/373a1e9366e711b89bc5e45bd6edf33ef62402cd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cec97102d4147e18568c93946014c4c8ebf86fcf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f08619f060468076e4acbdc10e0713af20d60e65'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92515.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92515'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536786'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-92515'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92515'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-92515.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-17T16:21:47.778Z'
epss: 0.002
epssPercentile: 0.09779
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-694
---

## Overview

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

bpf: Preserve unique-field state across nested structs

btf_find_struct_field() initializes a fresh seen mask for every recursive
descent. Unique special fields in different levels of the same aggregate
therefore do not see one another. The duplicate fields can reach
btf_parse_fields(), where they trigger an invariant WARN_ON_ONCE(). A
crafted user BTF can consequently trigger the warning before map creation
checks capabilities.

Initialize the seen mask once in btf_find_field() and pass the same pointer
through struct, datasec, and nested-struct walks. This gives the entire field
traversal one shared uniqueness state.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · 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 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92515.json)