CVE-2026-64361: Linux Vulnerability (CVSS 7.8)

Description

In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length check_and_correct_requested_length() compares (off + len) against node_size using u32 arithmetic. When the caller passes a large len value (e.g. from an underflowed subtraction in hfs_brec_remove()), off + len can wrap past 2^32 and produce a small result, causing the bounds check to pass when it should fail. For example, with off=14 and len=0xFFFFFFF2 (underflowed from data_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6, which is less than a typical node_size of 512, so the check passes and the subsequent memmove reads ~4GB past the node buffer. Fix this by widening the addition to u64 before comparing against node_size. This prevents the u32 wrap while keeping the logic straightforward.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.13%

2.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 67ecc81f6492275c9c54280532f558483c99c90e, < c8dd112173c02adf539fe2ad34a45f5e0068780d; >= a1a60e79502279f996e55052f50cc14919020475, < fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1; >= fe2891a9c43ab87d1a210d61e6438ca6936e2f62, < 671c3fcc2ad31c1311ea6414382a2d95104ae1b9; >= 384a66b89f9540a9a8cb0f48807697dfabaece4c, < b6a481642ea1977be2f84dc08c5affd742c177e7; >= efc095b35b23297e419c2ab4fc1ed1a8f0781a29, < 7399c3baee7bb622a92f0b895cd4d3009a693f2b; >= a431930c9bac518bf99d6b1da526a7f37ddee8d8, < 607217f7ad419b53926f71e3f75001813bbc08ad; >= a431930c9bac518bf99d6b1da526a7f37ddee8d8, < c25d3c931a63e762fcaa9cb125b901c53b62403f; >= a431930c9bac518bf99d6b1da526a7f37ddee8d8, < 966cb76fb2857a4242cab6ea2ea17acf818a3da7; e7d2dc2421e821e4045775e6dc226378328de6f6; fc7f732984ec91f30be3e574e0644066d07f2b78; eec522fd0d28106b14a59ab2d658605febe4a3bb; >= 5.10.241, < 5.10.261; >= 5.15.190, < 5.15.212; >= 6.1.149, < 6.1.178; >= 6.6.103, < 6.6.145; >= 6.12.43, < 6.12.97; >= 5.4.297, < 5.5; >= 6.15.11, < 6.16; >= 6.16.2, < 6.17
Linux	Linux	6.17

References

Timeline

Published: Jul 25, 2026
Last Modified: Aug 11, 2026
Status: Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64361?

In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length check_and_correct_requested_length() compares (off + len) against node_size using u32 arithmetic. When the caller passes a large len value (e.g. from an underflowed subtraction in hfs_brec_remove()), off + len can wrap past 2^32 and produce a small result, causing the bounds check to pass when it should fail. For example, with off=14 and len=0xFFFFFFF2 (underflowed from data_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6, which is less than a typical node_size of 512, so the check passes and the subsequent memmove reads ~4GB past the node buffer. Fix this by widening the addition to u64 before comparing against node_size. This prevents the u32 wrap while keeping the logic straightforward.

How severe is CVE-2026-64361?

CVE-2026-64361 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.

How do I fix CVE-2026-64361?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →