Local kernel-stack disclosure via early buffer return
Published Jul 25, 2026 · Updated Jul 25, 2026
Uninitialized-value use in Linux Kernel HFS/HFS+ handling allows local users to expose residual kernel-stack data through malformed metadata. The hfs_bnode_read function returns before writing its caller-provided buffer when offset validation fails or the corrected length becomes zero, while hfs_bnode_read_u16 and hfs_bnode_read_u8 consume the stack buffer unconditionally. Triggering requires local access to process malformed HFS or HFS+ metadata, and the supported consequence is disclosure of residual stack data rather than code execution or service interruption.
Summary
What happened
Uninitialized-value use in Linux Kernel HFS/HFS+ handling allows local users to expose residual kernel-stack data through malformed metadata. The hfs_bnode_read function returns before writing its caller-provided buffer when offset validation fails or the corrected length becomes zero, while hfs_bnode_read_u16 and hfs_bnode_read_u8 consume the stack buffer unconditionally. Triggering requires local access to process malformed HFS or HFS+ metadata, and the supported consequence is disclosure of residual stack data rather than code execution or service interruption.
The record
- CVE
- CVE-2026-64360
- 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 <16ca053c2be5f4f3044dccf7fc19237dc820d394
- 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 <6.12.96
- 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 <34684a04777358b2b40ac729e54c8e45359e46b3
- Affected versionversion=a1a60e79502279f996e55052f50cc14919020475 <0b189b2204f1a2612dc68f8d139fb5b80539e710
- Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <d5b45bad75cd2730b8452aed4d3b20a2b2a12576
- Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <d67aadee19ffdf3cc8520c5a4f4d5b2916d30baf
- Affected versionversion=a431930c9bac518bf99d6b1da526a7f37ddee8d8 <f3461b84a4865d9b5e70fbb71da72ae044a3bcd2
- Affected versionversion=e7d2dc2421e821e4045775e6dc226378328de6f6
- Affected versionversion=eec522fd0d28106b14a59ab2d658605febe4a3bb
- Affected versionversion=efc095b35b23297e419c2ab4fc1ed1a8f0781a29 <d2afc7ecee476f9251dd87444f7fb6a424410922
- Affected versionversion=fc7f732984ec91f30be3e574e0644066d07f2b78
- Affected versionversion=fe2891a9c43ab87d1a210d61e6438ca6936e2f62 <8f72fd25a57a457866350359ddd27a43caa62c95
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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