CVE-2026-64451

Kernel crash via stale tracer option write

Published Jul 25, 2026 · Updated Jul 25, 2026

NULL pointer dereference in Linux Kernel 6.19 allows local users with tracefs write access to crash the kernel through a stale option file. func_set_flag() reads tr->current_trace_flags before confirming that the active tracer is the function tracer, so a tracer switch can leave the pointer NULL. A process must keep a function-tracer option file open, switch to a non-function tracer, and then write the option; the resulting NULL dereference crashes the host.

CVSS severityUnavailable
Unscored
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel 6.19 allows local users with tracefs write access to crash the kernel through a stale option file. func_set_flag() reads tr->current_trace_flags before confirming that the active tracer is the function tracer, so a tracer switch can leave the pointer NULL. A process must keep a function-tracer option file open, switch to a non-function tracer, and then write the option; the resulting NULL dereference crashes the host.

The record

CVE
CVE-2026-64451
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=76680d0d2825900f23bf35290ab2b80bdf3a8e4a <69f17ac132a38974cf1defb480cef6b79d1ab768
  3. Affected versionversion=76680d0d2825900f23bf35290ab2b80bdf3a8e4a <c3e94604675e3db186111b8942650d86577df9b0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=76680d0d2825900f23bf35290ab2b80bdf3a8e4a <69f17ac132a38974cf1defb480cef6b79d1ab768; version=76680d0d2825900f23bf35290ab2b80bdf3a8e4a <c3e94604675e3db186111b8942650d86577df9b0

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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