CVE-2026-43272

Local system crash via uninitialized ring-buffer pointer

Published May 6, 2026 · Updated May 6, 2026

NULL-pointer dereference in Linux kernel 6.12 through 6.18.15 and 6.19 through 6.19.5 allows local users to crash the system. In rb_meta_validate_events(), head_page remains uninitialized before rb_validate_buffer, and the invalid-path cleanup loop dereferences it after reader-page validation fails. A low-privileged local user must induce that failure; the documented consequence is availability loss, not data exposure or modification.

CVSS severity5.5
Medium
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 6.12 through 6.18.15 and 6.19 through 6.19.5 allows local users to crash the system. In rb_meta_validate_events(), head_page remains uninitialized before rb_validate_buffer, and the invalid-path cleanup loop dereferences it after reader-page validation fails. A low-privileged local user must induce that failure; the documented consequence is availability loss, not data exposure or modification.

The record

CVE
CVE-2026-43272
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 <bc77986f3cb7476637052edf2d87137fa39f153d
  2. Affected versionversion=5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 <d9942396845fef2369478c157b26738fe07142f6
  3. Affected versionversion=5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 <f1547779402c4cd67755c33616b7203baa88420b
  4. Affected versionversion=6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 <bc77986f3cb7476637052edf2d87137fa39f153d; version=5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 <d9942396845fef2369478c157b26738fe07142f6; version=5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 <f1547779402c4cd67755c33616b7203baa88420b; version=6.12

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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