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Vulnerability record · CVE-2026-64361 · published 25 July 2026

CVE-2026-64361: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9% CWE-191 · CWE-191
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
4 Sep 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/607217f7ad419b53926f71e3f75001813bbc08ad Patch
https://git.kernel.org/stable/c/671c3fcc2ad31c1311ea6414382a2d95104ae1b9 Patch
https://git.kernel.org/stable/c/7399c3baee7bb622a92f0b895cd4d3009a693f2b Patch
https://git.kernel.org/stable/c/966cb76fb2857a4242cab6ea2ea17acf818a3da7 Patch
https://git.kernel.org/stable/c/b6a481642ea1977be2f84dc08c5affd742c177e7 Patch
https://git.kernel.org/stable/c/c25d3c931a63e762fcaa9cb125b901c53b62403f Patch
https://git.kernel.org/stable/c/c8dd112173c02adf539fe2ad34a45f5e0068780d Patch
https://git.kernel.org/stable/c/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64361), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.