# CVE-2026-64361: linux: In the Linux kernel, the following vulnerability has been resolved:  hfs/hfsplus: fix u32 overflow in check_and_corre...

CVE-2026-64361 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-64361, released August 1, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-64361
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 25, 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.180-1 | [DEBIAN-CVE-2026-64361](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64361.md) | Aug 1, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.100-1 | [DEBIAN-CVE-2026-64361](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64361.md) | Aug 1, 2026 |
| Linux | linux Debian 14 | 7.1.4-1 | [DEBIAN-CVE-2026-64361](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64361.md) | Aug 1, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.100-1~deb12u1 | [DEBIAN-CVE-2026-64361](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64361.md) | Aug 1, 2026 |

---

Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.