CVE-2023-53143Public exploit

Kernel crash via ext4 fsmap range underflow

Published May 2, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel ext4 filesystem allows local users to crash the kernel via an FS_IOC_GETFSMAP request. ext4_getfsmap_datadev fails to revalidate the ending key after raising the starting key to s_first_data_block, so a zero end block underflows to an impossible group number. The request reaches the kernel bug only against an ext4 filesystem using 1 KiB blocks, and the demonstrated consequence is a host crash.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel ext4 filesystem allows local users to crash the kernel via an FS_IOC_GETFSMAP request. ext4_getfsmap_datadev fails to revalidate the ending key after raising the starting key to s_first_data_block, so a zero end block underflows to an impossible group number. The request reaches the kernel bug only against an ext4 filesystem using 1 KiB blocks, and the demonstrated consequence is a host crash.

The record

CVE
CVE-2023-53143
Published
May 2, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.13
  2. Affected versionversion=4a4956249dac0b9b0027949907bff0cd1a9b57fa <15ebade3266b300da9cd1edce4004fe8fd6a2b88
  3. Affected versionversion=4a4956249dac0b9b0027949907bff0cd1a9b57fa <1d2366624b4c19a2ba6baf67fe57f4a1b0f67c05
  4. Affected versionversion=4a4956249dac0b9b0027949907bff0cd1a9b57fa <a70b49dc7eee5dbe3775a650ce598e3557ff5475
  5. Affected versionversion=4a4956249dac0b9b0027949907bff0cd1a9b57fa <c24f838493792b5e78a3596b4ca96375aa0af4c2
  6. Affected versionversion=4a4956249dac0b9b0027949907bff0cd1a9b57fa <c5d7c31e17224d847a330180ec1b03bf390632b2
  7. Affected versionversion=4a4956249dac0b9b0027949907bff0cd1a9b57fa <c993799baf9c5861f8df91beb80e1611b12efcbd
  8. Affected versionversion=4a4956249dac0b9b0027949907bff0cd1a9b57fa <eb3a695aa71a514f2e7f5778e05faba3733b70a0
  9. Affected versionversion=4a4956249dac0b9b0027949907bff0cd1a9b57fa <f16054ac1774915160ca4e1c73ff7a269465a1b9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=4a4956249dac0b9b0027949907bff0cd1a9b57fa <15ebade3266b300da9cd1edce4004fe8fd6a2b88; version=4a4956249dac0b9b0027949907bff0cd1a9b57fa <1d2366624b4c19a2ba6baf67fe57f4a1b0f67c05; version=4a4956249dac0b9b0027949907bff0cd1a9b57fa <a70b49dc7eee5dbe3775a650ce598e3557ff5475; version=4a4956249dac0b9b0027949907bff0cd1a9b57fa <c24f838493792b5e78a3596b4ca96375aa0af4c2; version=4a4956249dac0b9b0027949907bff0cd1a9b57fa <c5d7c31e17224d847a330180ec1b03bf390632b2; version=4a4956249dac0b9b0027949907bff0cd1a9b57fa <c993799baf9c5861f8df91beb80e1611b12efcbd; version=4a4956249dac0b9b0027949907bff0cd1a9b57fa <eb3a695aa71a514f2e7f5778e05faba3733b70a0; version=4a4956249dac0b9b0027949907bff0cd1a9b57fa <f16054ac1774915160ca4e1c73ff7a269465a1b9

Published CVSS scores

5.5UbuntuCVSS: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 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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