CVE-2026-93275

Kernel warning via nested AUX output contexts

Published Sep 24, 2026 · Updated Sep 24, 2026

Improper Intel PT event handling in Linux allows local users to trigger a kernel warning through grouped AUX sampling. The pt_event_stop() path skips perf_aux_output_end() when throttling supplies no PERF_EF_UPDATE flag, so pt_event_start() nests another perf_aux_output_begin(). Reaching the warning requires Intel Processor Trace, a throttled grouped event, and AUX-area sampling; no data disclosure, data modification, code execution, or service interruption is reported.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper Intel PT event handling in Linux allows local users to trigger a kernel warning through grouped AUX sampling. The pt_event_stop() path skips perf_aux_output_end() when throttling supplies no PERF_EF_UPDATE flag, so pt_event_start() nests another perf_aux_output_begin(). Reaching the warning requires Intel Processor Trace, a throttled grouped event, and AUX-area sampling; no data disclosure, data modification, code execution, or service interruption is reported.

The record

CVE
CVE-2026-93275
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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=4.1
  2. Affected versionversion=52ca9ced3f70779589e6ecc329baffe69d8f5f7a <2e17bf3a469a41457a3bc31b1f8fd66b6ce94a6d
  3. Affected versionversion=52ca9ced3f70779589e6ecc329baffe69d8f5f7a <304844b5545f444d523286da8228a1cbc46ffffa
  4. Affected versionversion=52ca9ced3f70779589e6ecc329baffe69d8f5f7a <9b919fb5512f256e9e0604faf960b2bb98aab454
  5. Affected versionversion=52ca9ced3f70779589e6ecc329baffe69d8f5f7a <cab5015ee3f25f789b4a368f2abfa65536576b78

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.1; version=52ca9ced3f70779589e6ecc329baffe69d8f5f7a <2e17bf3a469a41457a3bc31b1f8fd66b6ce94a6d; version=52ca9ced3f70779589e6ecc329baffe69d8f5f7a <304844b5545f444d523286da8228a1cbc46ffffa; version=52ca9ced3f70779589e6ecc329baffe69d8f5f7a <9b919fb5512f256e9e0604faf960b2bb98aab454; version=52ca9ced3f70779589e6ecc329baffe69d8f5f7a <cab5015ee3f25f789b4a368f2abfa65536576b78

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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