---
id: CVE-2026-92520
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Zero queue and stack outputs on lock failure

  Queue and stack pop/peek helpers accept an uninitialized output buffer
  because the verifier expects the helper to ini…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Zero queue and stack outputs on lock failure

  Queue and stack pop/peek helpers accept an uninitialized output buffer
  because the verifier expects the helper to ini…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8 <
    1534c4bff3aaca19c4c9a82f93e9b81f7c983de3
  - >-
    Linux >= a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8 <
    e2396b8a562073787e627a5f483f1bc5c452fa6a
  - >-
    Linux >= a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8 <
    7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232
  - Linux 40e34ea01748e5b8afdd40a172868be1e1ab0ede
  - Linux 388c9d3eefaea99828ee5000c693128a5b41ee7c
  - Linux acabf5df49aa3a4f9c96200102d893351b511a88
  - Linux e388671635acf470f0986d874389148fd234620b
  - Linux 232f0ba4d69263af5912e279fcc32fef2882b1dc
  - Linux >= 5.4.258 < 5.5
  - Linux >= 5.10.198 < 5.11
  - Linux >= 5.15.134 < 5.16
  - Linux >= 6.1.56 < 6.2
  - Linux >= 6.5.6 < 6.6
  - Linux 6.6
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:54.900'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92520'
references:
  - url: 'https://git.kernel.org/stable/c/1534c4bff3aaca19c4c9a82f93e9b81f7c983de3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e2396b8a562073787e627a5f483f1bc5c452fa6a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.776Z'
epss: 0.00206
epssPercentile: 0.09464
---

## Overview

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

bpf: Zero queue and stack outputs on lock failure

Queue and stack pop/peek helpers accept an uninitialized output buffer
because the verifier expects the helper to initialize it. The empty-map
error path clears the buffer, but a failed lock acquisition returns
-EBUSY without writing it.

Clear the output before returning -EBUSY so BPF programs cannot observe
uninitialized stack contents after a failed helper call.

## Remediation

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