CVE-2026-99093Public exploit

Boot panic via premature page-table work scheduling

Published Oct 26, 2026 · Updated Oct 26, 2026

A boot-time NULL dereference in Linux 7.3-rc4 memory management allows attackers to panic the kernel via function-tracer boot settings. When tracer trampoline protection causes page-table collapse, pagetable_free_kernel() schedules deferred freeing before system_percpu_wq exists. The documented trigger requires boot-time function tracing with a filter such as pud_free_pmd_page; the resulting panic prevents boot completion, with no demonstrated disclosure or code execution.

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

What happened

A boot-time NULL dereference in Linux 7.3-rc4 memory management allows attackers to panic the kernel via function-tracer boot settings. When tracer trampoline protection causes page-table collapse, pagetable_free_kernel() schedules deferred freeing before system_percpu_wq exists. The documented trigger requires boot-time function tracing with a filter such as pud_free_pmd_page; the resulting panic prevents boot completion, with no demonstrated disclosure or code execution.

The record

CVE
CVE-2026-99093
Published
Oct 26, 2026
Updated
Oct 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.18.53 <6.18.57
  2. Affected versionversion=7.2.7 <7.2.11
  3. Affected versionversion=84e0cd79d57f06b872154eb5d8f610584133f260 <7a25ca170c12a9328f6fcf4410713beb516b01c0
  4. Affected versionversion=922873cf4fc34124215070a8ad391bf831538bb9 <df6c704a08bc0925d5db047b0a6221f962bda4d9
  5. Affected versionversion=9e4a3ec3411bb6bb59e3c1f29b75609f1e87aac4 <2fb552b0bee70c24c092720028ab4620f5eb2646

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.18.53 <6.18.57; version=7.2.7 <7.2.11; version=84e0cd79d57f06b872154eb5d8f610584133f260 <7a25ca170c12a9328f6fcf4410713beb516b01c0; version=922873cf4fc34124215070a8ad391bf831538bb9 <df6c704a08bc0925d5db047b0a6221f962bda4d9; version=9e4a3ec3411bb6bb59e3c1f29b75609f1e87aac4 <2fb552b0bee70c24c092720028ab4620f5eb2646

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

No sourced classifications are available.

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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