CVE-2025-37740

Kernel crash via zero JFS allocation-group width

Published May 1, 2025 · Updated May 11, 2026

Divide-by-zero in the Linux kernel JFS allocator allows local users to crash the kernel by mounting a crafted JFS image. A zero allocation-group width read from dmapctl metadata reaches dbAllocAG, where control-page level calculation divides by that unchecked value. The trigger requires local access and the ability to cause the malformed filesystem to be mounted; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in the Linux kernel JFS allocator allows local users to crash the kernel by mounting a crafted JFS image. A zero allocation-group width read from dmapctl metadata reaches dbAllocAG, where control-page level calculation divides by that unchecked value. The trigger requires local access and the ability to cause the malformed filesystem to be mounted; the bounded consequence is a kernel crash.

The record

CVE
CVE-2025-37740
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <722e72f7f9c69fcb3ab7988c2471feff7a4c8de1
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a065cec230aa807c18828a3eee82f1c8592c2adf
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a260bf14cd347878f01f70739ba829442a474a16
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a741f29ac8b6374c9904be8b7ac7cdfcd7e7e4fa
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8c96a9e7660e5e5eea445978fe8f2e432d91c1f
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cc0bc4cb62ce5fa0c383e3bf0765d01f46bd49ac
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ccd97c8a4f90810f228ee40d1055148fa146dd57
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ddf2846f22e8575d6b4b6a66f2100f168b8cd73d
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e3f85edb03183fb06539e5b50dd2c4bb42b869f0
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <722e72f7f9c69fcb3ab7988c2471feff7a4c8de1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a065cec230aa807c18828a3eee82f1c8592c2adf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a260bf14cd347878f01f70739ba829442a474a16; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a741f29ac8b6374c9904be8b7ac7cdfcd7e7e4fa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8c96a9e7660e5e5eea445978fe8f2e432d91c1f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cc0bc4cb62ce5fa0c383e3bf0765d01f46bd49ac; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ccd97c8a4f90810f228ee40d1055148fa146dd57; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ddf2846f22e8575d6b4b6a66f2100f168b8cd73d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e3f85edb03183fb06539e5b50dd2c4bb42b869f0; version=2.6.12

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-369Divide By Zero
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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