CVE-2026-64361

Kernel memory corruption via wrapped HFS length check

Published Jul 25, 2026 · Updated Jul 25, 2026

Memory corruption in Linux Kernel HFS/HFS+ support allows local users to corrupt kernel memory through a crafted mounted volume. check_and_correct_requested_length() adds off and len as u32 values, so a wrapped sum passes the node-size check and drives a near-4-GiB out-of-bounds memmove. An HFS/HFS+ volume must already be mounted, after which an unprivileged local user with ordinary write access can trigger kernel-memory disclosure, corruption, or a panic through permitted filesystem operations.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Linux Kernel HFS/HFS+ support allows local users to corrupt kernel memory through a crafted mounted volume. check_and_correct_requested_length() adds off and len as u32 values, so a wrapped sum passes the node-size check and drives a near-4-GiB out-of-bounds memmove. An HFS/HFS+ volume must already be mounted, after which an unprivileged local user with ordinary write access can trigger kernel-memory disclosure, corruption, or a panic through permitted filesystem operations.

The record

CVE
CVE-2026-64361
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=384a66b89f9540a9a8cb0f48807697dfabaece4c <b6a481642ea1977be2f84dc08c5affd742c177e7
  2. Affected versionversion=5.10.241 <5.10.261
  3. Affected versionversion=5.15.190 <5.15.212
  4. Affected versionversion=5.4.297 <5.5
  5. Affected versionversion=6.1.149 <6.1.178
  6. Affected versionversion=6.12.43 <6.12.97
  7. Affected versionversion=6.15.11 <6.16
  8. Affected versionversion=6.16.2 <6.17
  9. Affected versionversion=6.17
  10. Affected versionversion=6.6.103 <6.6.145
  11. Affected versionversion=67ecc81f6492275c9c54280532f558483c99c90e <c8dd112173c02adf539fe2ad34a45f5e0068780d
  12. Affected versionversion=a1a60e79502279f996e55052f50cc14919020475 <fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1
  13. Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <607217f7ad419b53926f71e3f75001813bbc08ad
  14. Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <966cb76fb2857a4242cab6ea2ea17acf818a3da7
  15. Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <c25d3c931a63e762fcaa9cb125b901c53b62403f
  16. Affected versionversion=e7d2dc2421e821e4045775e6dc226378328de6f6
  17. Affected versionversion=eec522fd0d28106b14a59ab2d658605febe4a3bb
  18. Affected versionversion=efc095b35b23297e419c2ab4fc1ed1a8f0781a29 <7399c3baee7bb622a92f0b895cd4d3009a693f2b
  19. Affected versionversion=fc7f732984ec91f30be3e574e0644066d07f2b78
  20. Affected versionversion=fe2891a9c43ab87d1a210d61e6438ca6936e2f62 <671c3fcc2ad31c1311ea6414382a2d95104ae1b9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=384a66b89f9540a9a8cb0f48807697dfabaece4c <b6a481642ea1977be2f84dc08c5affd742c177e7; version=5.10.241 <5.10.261; version=5.15.190 <5.15.212; version=5.4.297 <5.5; version=6.1.149 <6.1.178; version=6.12.43 <6.12.97; version=6.15.11 <6.16; version=6.16.2 <6.17; version=6.17; version=6.6.103 <6.6.145; version=67ecc81f6492275c9c54280532f558483c99c90e <c8dd112173c02adf539fe2ad34a45f5e0068780d; version=a1a60e79502279f996e55052f50cc14919020475 <fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1; version=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <607217f7ad419b53926f71e3f75001813bbc08ad; version=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <966cb76fb2857a4242cab6ea2ea17acf818a3da7; version=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <c25d3c931a63e762fcaa9cb125b901c53b62403f; version=e7d2dc2421e821e4045775e6dc226378328de6f6; version=eec522fd0d28106b14a59ab2d658605febe4a3bb; version=efc095b35b23297e419c2ab4fc1ed1a8f0781a29 <7399c3baee7bb622a92f0b895cd4d3009a693f2b; version=fc7f732984ec91f30be3e574e0644066d07f2b78; version=fe2891a9c43ab87d1a210d61e6438ca6936e2f62 <671c3fcc2ad31c1311ea6414382a2d95104ae1b9

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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