CVE-2025-38230

Kernel memory corruption via unvalidated JFS metadata

Published Jul 4, 2025 · Updated Aug 5, 2026

Out-of-bounds access in Linux JFS allows attackers to corrupt kernel memory and crash the system via a crafted filesystem image. dbMount accepts unvalidated db_agheight, db_agwidth, and db_agstart metadata, allowing dbAllocAG to perform a negative shift and index beyond its stree allocation map. A user or automounter must mount the image; later file allocation can expose kernel heap data, corrupt allocation state, or panic the system.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds access in Linux JFS allows attackers to corrupt kernel memory and crash the system via a crafted filesystem image. dbMount accepts unvalidated db_agheight, db_agwidth, and db_agstart metadata, allowing dbAllocAG to perform a negative shift and index beyond its stree allocation map. A user or automounter must mount the image; later file allocation can expose kernel heap data, corrupt allocation state, or panic the system.

The record

CVE
CVE-2025-38230
Published
Jul 4, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 <0c40fa81f850556e9aa0185fede9ef1112db7b39
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37bfb464ddca87f203071b5bd562cd91ddc0b40a
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8b69608c6b6779a7ab07ce4467a56df90152cfb9
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9242ff6245527a3ebb693ddd175493b38ddca72f
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <95ae5ee6069d9a5945772625f289422ef659221a
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a4259e72363e1ea204a97292001a9fc36c7e52fd
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b62a1e59d8716bbd2e73660743fe06acc97ed7d1
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c3705c82b7406a15ef38a610d03bf6baa43d6e0c
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c40fa81f850556e9aa0185fede9ef1112db7b39; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37bfb464ddca87f203071b5bd562cd91ddc0b40a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8b69608c6b6779a7ab07ce4467a56df90152cfb9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9242ff6245527a3ebb693ddd175493b38ddca72f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <95ae5ee6069d9a5945772625f289422ef659221a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a4259e72363e1ea204a97292001a9fc36c7e52fd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b62a1e59d8716bbd2e73660743fe06acc97ed7d1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c3705c82b7406a15ef38a610d03bf6baa43d6e0c; version=2.6.12

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.0OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002Malicious File

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo