CVE-2026-64360

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References