CVE-2026-46122

Kernel memory disclosure via unchecked firmware index

Published May 28, 2026 · Updated May 28, 2026

Out-of-bounds read in the Linux Kernel b43 wireless driver allows local users to read beyond its key array via a firmware-supplied index. In b43_rx(), a firmware-controlled index can exceed the 58-entry dev->key array because B43_WARN_ON records the condition without stopping the array access in production builds. Exposure requires the b43 driver, compatible Broadcom hardware, and firmware returning an invalid index; the published mechanism establishes memory disclosure but documents no code-execution path.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux Kernel b43 wireless driver allows local users to read beyond its key array via a firmware-supplied index. In b43_rx(), a firmware-controlled index can exceed the 58-entry dev->key array because B43_WARN_ON records the condition without stopping the array access in production builds. Exposure requires the b43 driver, compatible Broadcom hardware, and firmware returning an invalid index; the published mechanism establishes memory disclosure but documents no code-execution path.

The record

CVE
CVE-2026-46122
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-129
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.24
  2. Affected versionversion=e4d6b7951812d98417feb10784e400e253caf633 <1e9e55cf66f0fa4799f4d86ef3aaba8e606b5c14
  3. Affected versionversion=e4d6b7951812d98417feb10784e400e253caf633 <1f4f78bf8549e6ac4f04fba4176854f3a6e0c332
  4. Affected versionversion=e4d6b7951812d98417feb10784e400e253caf633 <219ba67e69e49681e48c822d6eaafb5def032f34
  5. Affected versionversion=e4d6b7951812d98417feb10784e400e253caf633 <c3d7b90dc95020cd9282c4630e402fe224f7644e
  6. Affected versionversion=e4d6b7951812d98417feb10784e400e253caf633 <d7029879bafdac2006c67553807d122283dc6cbf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.24; version=e4d6b7951812d98417feb10784e400e253caf633 <1e9e55cf66f0fa4799f4d86ef3aaba8e606b5c14; version=e4d6b7951812d98417feb10784e400e253caf633 <1f4f78bf8549e6ac4f04fba4176854f3a6e0c332; version=e4d6b7951812d98417feb10784e400e253caf633 <219ba67e69e49681e48c822d6eaafb5def032f34; version=e4d6b7951812d98417feb10784e400e253caf633 <c3d7b90dc95020cd9282c4630e402fe224f7644e; version=e4d6b7951812d98417feb10784e400e253caf633 <d7029879bafdac2006c67553807d122283dc6cbf

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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