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.

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EPSS — Exploit Prediction

0.0022

Probability of exploitation

0.13%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other 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 https://git.kernel.org/stable/c/d5b45bad75cd2730b8452aed4d3b20a2b2a12576 https://git.kernel.org/stable/c/d67aadee19ffdf3cc8520c5a4f4d5b2916d30baf https://git.kernel.org/stable/c/f3461b84a4865d9b5e70fbb71da72ae044a3bcd2

Frequently Asked Questions

What is CVE-2026-64360? +

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.

How do I check if I'm vulnerable to CVE-2026-64360? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.