CVE-2026-92500Public exploit

Kernel crashes or data loss via inline-write race

Published Sep 17, 2026 · Updated Sep 17, 2026

A race in Linux ext4 allows local users to crash the kernel or lose file data via concurrent buffered writes and memory-mapped writes. The write_end handlers consult mutable inode flags after write_begin, selecting extent handling without allocated block buffers; ext4_write_inline_data_end also asserts inline state after acquiring its lock. Triggering requires writable ext4 inline data and concurrent conversion to extents, causing NULL pointer dereferences, a kernel panic, or lost writes.

CVSS severity4.7
Medium
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race in Linux ext4 allows local users to crash the kernel or lose file data via concurrent buffered writes and memory-mapped writes. The write_end handlers consult mutable inode flags after write_begin, selecting extent handling without allocated block buffers; ext4_write_inline_data_end also asserts inline state after acquiring its lock. Triggering requires writable ext4 inline data and concurrent conversion to extents, causing NULL pointer dereferences, a kernel panic, or lost writes.

The record

CVE
CVE-2026-92500
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=3.8
  2. Affected versionversion=3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb <439aedfd7ae868d1d7b4930afe66091cb979cd5c
  3. Affected versionversion=3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb <7edbb323bab2b2a609016014caafdb651c898249
  4. Affected versionversion=3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb <bd8d74bd46d09905164255b8635fa58b45f41068

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb <439aedfd7ae868d1d7b4930afe66091cb979cd5c; version=3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb <7edbb323bab2b2a609016014caafdb651c898249; version=3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb <bd8d74bd46d09905164255b8635fa58b45f41068

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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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
Privilegesauthenticated
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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