CVE-2026-80662

Kernel-stack disclosure via oversized CXL header copy

Published Aug 28, 2026 · Updated Aug 28, 2026

An out-of-bounds read in the Linux kernel CXL RAS path allows local users to obtain kernel-stack data through tracefs events. header_log_copy() reads 128 dwords from an 88-byte mapping, while the trace event copies 512 bytes from a 64-byte stack-resident header log. Exposure requires a CXL RAS error to reach this path and permission to read the affected tracefs ring buffer; the disclosed impact is stack-data exposure only.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
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 CXL RAS path allows local users to obtain kernel-stack data through tracefs events. header_log_copy() reads 128 dwords from an 88-byte mapping, while the trace event copies 512 bytes from a 64-byte stack-resident header log. Exposure requires a CXL RAS error to reach this path and permission to read the affected tracefs ring buffer; the disclosed impact is stack-data exposure only.

The record

CVE
CVE-2026-80662
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 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=2905cb5236cba63a5dc8a83752dcc31f3cc819f9 <6fc1919a6f2ed541484dd1f6cd93374044f8fd3d
  2. Affected versionversion=2905cb5236cba63a5dc8a83752dcc31f3cc819f9 <c268f949e219f9e179558e836f457f6c5fbec416
  3. Affected versionversion=2905cb5236cba63a5dc8a83752dcc31f3cc819f9 <fc5eb0962a5e50d64e711817cc24d67df2d90528
  4. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2905cb5236cba63a5dc8a83752dcc31f3cc819f9 <6fc1919a6f2ed541484dd1f6cd93374044f8fd3d; version=2905cb5236cba63a5dc8a83752dcc31f3cc819f9 <c268f949e219f9e179558e836f457f6c5fbec416; version=2905cb5236cba63a5dc8a83752dcc31f3cc819f9 <fc5eb0962a5e50d64e711817cc24d67df2d90528; version=6.2

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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

T1005Data from Local System

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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