CVE-2026-99141Public exploit

Kernel crash via stale trace entries

Published Oct 28, 2026 · Updated Oct 28, 2026

NULL dereference in Linux 6.19 ftrace allows local users to trigger a kernel crash by reading stale function-graph traces. tracing_set_tracer() leaves current_trace_flags NULL when selecting a tracer without flags, and print_graph_function_event() dereferences it while printing retained entries. Triggering requires access to tracefs controls and enabled tracers; a saved snapshot reaches the fault without a race.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

NULL dereference in Linux 6.19 ftrace allows local users to trigger a kernel crash by reading stale function-graph traces. tracing_set_tracer() leaves current_trace_flags NULL when selecting a tracer without flags, and print_graph_function_event() dereferences it while printing retained entries. Triggering requires access to tracefs controls and enabled tracers; a saved snapshot reaches the fault without a race.

The record

CVE
CVE-2026-99141
Published
Oct 28, 2026
Updated
Oct 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 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=6.19
  2. Affected versionversion=e29aa918a928408c3e64b0d1025e4eb9f6fc549e <3cc117514d69067a94d6c7479730dce41e678f50
  3. Affected versionversion=e29aa918a928408c3e64b0d1025e4eb9f6fc549e <b1547c6ba93b8863010aa324cd20c441f886f23e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=e29aa918a928408c3e64b0d1025e4eb9f6fc549e <3cc117514d69067a94d6c7479730dce41e678f50; version=e29aa918a928408c3e64b0d1025e4eb9f6fc549e <b1547c6ba93b8863010aa324cd20c441f886f23e

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 exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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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