CVE-2026-53015

Local denial of service via EROFS offset truncation

Published Jun 24, 2026 · Updated Jun 24, 2026

Integer truncation in Linux Kernel EROFS allows local users to interrupt 32-bit systems via filesystem offsets beyond 4 GiB. In fs/erofs/zmap.c, logical cluster numbers stored as unsigned long or unsigned int are shifted by lclusterbits, truncating the calculated offset at the 4 GiB boundary. Exploitation requires local low-privileged access, a 32-bit kernel, and EROFS data large enough to cross that boundary; the published assessment reports availability impact only.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer truncation in Linux Kernel EROFS allows local users to interrupt 32-bit systems via filesystem offsets beyond 4 GiB. In fs/erofs/zmap.c, logical cluster numbers stored as unsigned long or unsigned int are shifted by lclusterbits, truncating the calculated offset at the 4 GiB boundary. Exploitation requires local low-privileged access, a 32-bit kernel, and EROFS data large enough to cross that boundary; the published assessment reports availability impact only.

The record

CVE
CVE-2026-53015
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=152a333a589560bee002e4c96761f1b560a5793c <2d8c7edcb661812249469f4a5b62e9339118846f
  2. Affected versionversion=152a333a589560bee002e4c96761f1b560a5793c <4fc9b12e43a3f19a01a8fb61f7961be79de20253
  3. Affected versionversion=152a333a589560bee002e4c96761f1b560a5793c <582b0bf201157632cb5474c885989a6ebda46521
  4. Affected versionversion=152a333a589560bee002e4c96761f1b560a5793c <858e4d98a86adf34584767388deb6c9b217f70c5
  5. Affected versionversion=5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=152a333a589560bee002e4c96761f1b560a5793c <2d8c7edcb661812249469f4a5b62e9339118846f; version=152a333a589560bee002e4c96761f1b560a5793c <4fc9b12e43a3f19a01a8fb61f7961be79de20253; version=152a333a589560bee002e4c96761f1b560a5793c <582b0bf201157632cb5474c885989a6ebda46521; version=152a333a589560bee002e4c96761f1b560a5793c <858e4d98a86adf34584767388deb6c9b217f70c5; version=5.3

Published CVSS scores

3.6Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
5.5NIST NVDCVSS: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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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