CVE-2023-54069Public exploit

Kernel crash via ext4 extent-end overflow

Published Dec 24, 2025 · Updated Dec 24, 2025

Integer overflow in affected Linux kernel ext4 allocation code allows local users with write access to trigger a kernel crash. ext4_mb_new_inode_pa computes an extent end using ext4_lblk_t arithmetic, so adding a near-maximum logical block and goal length wraps the result to zero before a BUG_ON comparison. Reaching the crash requires write access to a mounted ext4 filesystem and a crafted sequence of sparse allocation, stress, deletion, and direct-write operations; the demonstrated consequence is service interruption through a kernel crash.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in affected Linux kernel ext4 allocation code allows local users with write access to trigger a kernel crash. ext4_mb_new_inode_pa computes an extent end using ext4_lblk_t arithmetic, so adding a near-maximum logical block and goal length wraps the result to zero before a BUG_ON comparison. Reaching the crash requires write access to a mounted ext4 filesystem and a crafted sequence of sparse allocation, stress, deletion, and direct-write operations; the demonstrated consequence is service interruption through a kernel crash.

The record

CVE
CVE-2023-54069
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record 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=25a60b4533268477920faaeebd99e7e69c0735cd
  2. Affected versionversion=46772ab99409cc72241227dd8f5295f358233fda
  3. Affected versionversion=613f6cde5ebb005a37fda117cdda7b4126170c13 <f2c3a3aa6f11ad9878dbc3a067b0633e07b586c1
  4. Affected versionversion=6.4
  5. Affected versionversion=8659c5f4ffaacbe932849b98462c3d635b4eacea <83ecffd40c65844a73c2e93d7c841455786605ac
  6. Affected versionversion=93cdf49f6eca5e23f6546b8f28457b2e6a6961d9 <b7e9ec38b6a0beb5a49cd1e76be0a9a07c218e90
  7. Affected versionversion=93cdf49f6eca5e23f6546b8f28457b2e6a6961d9 <bc056e7163ac7db945366de219745cf94f32a3e6
  8. Affected versionversion=9d4430b7f862ce8835ca4e054b6916d15c8e0862 <fcefddf3a151b2c416b20120c06bb1ba9ad676fb
  9. Affected versionversion=cec4ef62b36b04e0bc8905732adab091f4bc1cfd
  10. Affected versionversion=fc7237e191b99f88e859316fab2b06c2c26c8344 <58fe961c606c446f5612f6897827b1cac42c2e89

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=25a60b4533268477920faaeebd99e7e69c0735cd; version=46772ab99409cc72241227dd8f5295f358233fda; version=613f6cde5ebb005a37fda117cdda7b4126170c13 <f2c3a3aa6f11ad9878dbc3a067b0633e07b586c1; version=6.4; version=8659c5f4ffaacbe932849b98462c3d635b4eacea <83ecffd40c65844a73c2e93d7c841455786605ac; version=93cdf49f6eca5e23f6546b8f28457b2e6a6961d9 <b7e9ec38b6a0beb5a49cd1e76be0a9a07c218e90; version=93cdf49f6eca5e23f6546b8f28457b2e6a6961d9 <bc056e7163ac7db945366de219745cf94f32a3e6; version=9d4430b7f862ce8835ca4e054b6916d15c8e0862 <fcefddf3a151b2c416b20120c06bb1ba9ad676fb; version=cec4ef62b36b04e0bc8905732adab091f4bc1cfd; version=fc7237e191b99f88e859316fab2b06c2c26c8344 <58fe961c606c446f5612f6897827b1cac42c2e89

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

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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 exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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