CVE-2026-64361

hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length

State: Published
Severity: 7.8 High
Published: Jul 25, 2026
Updated: Aug 17, 2026
Reserved: Jul 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	67ecc81f6492275c9c54280532f558483c99c90e to before c8dd112173c02adf539fe2ad34a45f5e0068780dAffected a1a60e79502279f996e55052f50cc14919020475 to before fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1Affected fe2891a9c43ab87d1a210d61e6438ca6936e2f62 to before 671c3fcc2ad31c1311ea6414382a2d95104ae1b9Affected 384a66b89f9540a9a8cb0f48807697dfabaece4c to before b6a481642ea1977be2f84dc08c5affd742c177e7Affected efc095b35b23297e419c2ab4fc1ed1a8f0781a29 to before 7399c3baee7bb622a92f0b895cd4d3009a693f2bAffected a431930c9bac518bf99d6b1da526a7f37ddee8d8 to before 607217f7ad419b53926f71e3f75001813bbc08adAffected a431930c9bac518bf99d6b1da526a7f37ddee8d8 to before c25d3c931a63e762fcaa9cb125b901c53b62403fAffected a431930c9bac518bf99d6b1da526a7f37ddee8d8 to before 966cb76fb2857a4242cab6ea2ea17acf818a3da7Affected e7d2dc2421e821e4045775e6dc226378328de6f6Affected fc7f732984ec91f30be3e574e0644066d07f2b78Affected eec522fd0d28106b14a59ab2d658605febe4a3bbAffected 5.10.241 to before 5.10.261Affected 5.15.190 to before 5.15.212Affected 6.1.149 to before 6.1.178Affected 6.6.103 to before 6.6.145Affected 6.12.43 to before 6.12.97Affected 5.4.297 to before 5.5Affected 6.15.11 to before 6.16Affected 6.16.2 to before 6.17Affected
LinuxLinux	6.17Affected before 6.17Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.4 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

67ecc81f6492275c9c54280532f558483c99c90e to before c8dd112173c02adf539fe2ad34a45f5e0068780dAffected
a1a60e79502279f996e55052f50cc14919020475 to before fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1Affected
fe2891a9c43ab87d1a210d61e6438ca6936e2f62 to before 671c3fcc2ad31c1311ea6414382a2d95104ae1b9Affected
384a66b89f9540a9a8cb0f48807697dfabaece4c to before b6a481642ea1977be2f84dc08c5affd742c177e7Affected
efc095b35b23297e419c2ab4fc1ed1a8f0781a29 to before 7399c3baee7bb622a92f0b895cd4d3009a693f2bAffected
a431930c9bac518bf99d6b1da526a7f37ddee8d8 to before 607217f7ad419b53926f71e3f75001813bbc08adAffected
a431930c9bac518bf99d6b1da526a7f37ddee8d8 to before c25d3c931a63e762fcaa9cb125b901c53b62403fAffected
a431930c9bac518bf99d6b1da526a7f37ddee8d8 to before 966cb76fb2857a4242cab6ea2ea17acf818a3da7Affected
e7d2dc2421e821e4045775e6dc226378328de6f6Affected
fc7f732984ec91f30be3e574e0644066d07f2b78Affected
eec522fd0d28106b14a59ab2d658605febe4a3bbAffected
5.10.241 to before 5.10.261Affected
5.15.190 to before 5.15.212Affected
6.1.149 to before 6.1.178Affected
6.6.103 to before 6.6.145Affected
6.12.43 to before 6.12.97Affected
5.4.297 to before 5.5Affected
6.15.11 to before 6.16Affected
6.16.2 to before 6.17Affected

LinuxLinux

6.17Affected
before 6.17Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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