CVE-2026-46203

Kernel memory disclosure or crash during driver unbind

Published May 28, 2026 · Updated May 28, 2026

An out-of-bounds read in the Linux kernel 6.7 through 7.1-rc1 allows local users to disclose kernel memory or crash the host during driver unbind. The cadence-quadspi removal path disables the controller without first runtime-resuming it, causing register access while the controller clock is off. Reachability requires local access and a system with a Cadence QuadSPI controller undergoing driver unbind; the bounded consequences are kernel-memory disclosure or a host crash.

CVSS severity7.1
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

An out-of-bounds read in the Linux kernel 6.7 through 7.1-rc1 allows local users to disclose kernel memory or crash the host during driver unbind. The cadence-quadspi removal path disables the controller without first runtime-resuming it, causing register access while the controller clock is off. Reachability requires local access and a system with a Cadence QuadSPI controller undergoing driver unbind; the bounded consequences are kernel-memory disclosure or a host crash.

The record

CVE
CVE-2026-46203
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499.004
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=0578a6dbfe7514db7134501cf93acc21cf13e479 <233db2cb14db8b1935dda52a6affd97276462b82
  2. Affected versionversion=0578a6dbfe7514db7134501cf93acc21cf13e479 <d67a5311818b3e6481a1e4293c9337ebfee73111
  3. Affected versionversion=6.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0578a6dbfe7514db7134501cf93acc21cf13e479 <233db2cb14db8b1935dda52a6affd97276462b82; version=0578a6dbfe7514db7134501cf93acc21cf13e479 <d67a5311818b3e6481a1e4293c9337ebfee73111; version=6.7

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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