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.
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
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- Jul 25, 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.
- Affected versionversion=384a66b89f9540a9a8cb0f48807697dfabaece4c <b6a481642ea1977be2f84dc08c5affd742c177e7
- Affected versionversion=5.10.241 <5.10.261
- Affected versionversion=5.15.190 <5.15.212
- Affected versionversion=5.4.297 <5.5
- Affected versionversion=6.1.149 <6.1.178
- Affected versionversion=6.12.43 <6.12.97
- Affected versionversion=6.15.11 <6.16
- Affected versionversion=6.16.2 <6.17
- Affected versionversion=6.17
- Affected versionversion=6.6.103 <6.6.145
- Affected versionversion=67ecc81f6492275c9c54280532f558483c99c90e <c8dd112173c02adf539fe2ad34a45f5e0068780d
- Affected versionversion=a1a60e79502279f996e55052f50cc14919020475 <fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1
- Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <607217f7ad419b53926f71e3f75001813bbc08ad
- Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <966cb76fb2857a4242cab6ea2ea17acf818a3da7
- Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <c25d3c931a63e762fcaa9cb125b901c53b62403f
- Affected versionversion=e7d2dc2421e821e4045775e6dc226378328de6f6
- Affected versionversion=eec522fd0d28106b14a59ab2d658605febe4a3bb
- Affected versionversion=efc095b35b23297e419c2ab4fc1ed1a8f0781a29 <7399c3baee7bb622a92f0b895cd4d3009a693f2b
- Affected versionversion=fc7f732984ec91f30be3e574e0644066d07f2b78
- Affected versionversion=fe2891a9c43ab87d1a210d61e6438ca6936e2f62 <671c3fcc2ad31c1311ea6414382a2d95104ae1b9
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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