CVE-2026-64360

Description

In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: zero-initialize buffer in hfs_bnode_read hfs_bnode_read() can return early without writing to the output buffer when is_bnode_offset_valid() fails or when check_and_correct_requested_ length() corrects the length to zero. Callers such as hfs_bnode_read_ u16() and hfs_bnode_read_u8() pass stack-allocated buffers and use the result unconditionally, leading to KMSAN uninit-value reports. Rather than initializing at each individual call site, zero the buffer at the start of hfs_bnode_read() before any validation checks. This ensures all callers in both hfs and hfsplus get a deterministic zero value regardless of which early-return path is taken.

References

• https://git.kernel.org/stable/c/0b189b2204f1a2612dc68f8d139fb5b80539e710
• https://git.kernel.org/stable/c/16ca053c2be5f4f3044dccf7fc19237dc820d394
• https://git.kernel.org/stable/c/34684a04777358b2b40ac729e54c8e45359e46b3
• https://git.kernel.org/stable/c/8f72fd25a57a457866350359ddd27a43caa62c95
• https://git.kernel.org/stable/c/d2afc7ecee476f9251dd87444f7fb6a424410922