CVE-2026-99159Public exploit

Crash via incorrect persistent-buffer sub-buffer indexing

Published Oct 28, 2026 · Updated Oct 28, 2026

An indexing error in Linux's tracing ring buffer allows local users to trigger a kernel crash by mapping trace_pipe_raw. rb_meta_subbuf_idx() omits the metadata header when calculating the sub-buffer base, shifting indices and leaving a NULL entry that __rb_map_vma() dereferences. Triggering requires access to tracefs and a persistent buffer with an affected alignment; incorrect saved indices also cause the previous boot's trace to be discarded.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An indexing error in Linux's tracing ring buffer allows local users to trigger a kernel crash by mapping trace_pipe_raw. rb_meta_subbuf_idx() omits the metadata header when calculating the sub-buffer base, shifting indices and leaving a NULL entry that __rb_map_vma() dereferences. Triggering requires access to tracefs and a persistent buffer with an affected alignment; incorrect saved indices also cause the previous boot's trace to be discarded.

The record

CVE
CVE-2026-99159
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=6.12
  2. Affected versionversion=b14d032973d4e6c36e025e96ea3437de53d072d9 <25132363c723afc39aace8b098f547ab4a0ea759
  3. Affected versionversion=b14d032973d4e6c36e025e96ea3437de53d072d9 <2f1248b728b56d583ea454fedf239550c49f7b18
  4. Affected versionversion=b14d032973d4e6c36e025e96ea3437de53d072d9 <7469b3585ef5f65840d467d2caa811a9098c84b9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=b14d032973d4e6c36e025e96ea3437de53d072d9 <25132363c723afc39aace8b098f547ab4a0ea759; version=b14d032973d4e6c36e025e96ea3437de53d072d9 <2f1248b728b56d583ea454fedf239550c49f7b18; version=b14d032973d4e6c36e025e96ea3437de53d072d9 <7469b3585ef5f65840d467d2caa811a9098c84b9

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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