{"id":"CVE-2026-64361","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfs/hfsplus: fix u32 overflow in check_and_correct_requested_length\n\ncheck_and_correct_requested_length() compares (off + len) against\nnode_size using u32 arithmetic","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfs/hfsplus: fix u32 overflow in check_and_correct_requested_length\n\ncheck_and_correct_requested_length() compares (off + len) against\nnode_size using u32 arithmetic.  …","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","published":"2026-07-25","updated":"2026-07-27","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64361","references":[{"url":"https://git.kernel.org/stable/c/607217f7ad419b53926f71e3f75001813bbc08ad","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/671c3fcc2ad31c1311ea6414382a2d95104ae1b9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7399c3baee7bb622a92f0b895cd4d3009a693f2b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/966cb76fb2857a4242cab6ea2ea17acf818a3da7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b6a481642ea1977be2f84dc08c5affd742c177e7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c25d3c931a63e762fcaa9cb125b901c53b62403f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c8dd112173c02adf539fe2ad34a45f5e0068780d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00129,"epssPercentile":0.02935,"ingestedAt":"2026-07-27T06:16:50.708Z","slug":"CVE-2026-64361","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nhfs/hfsplus: fix u32 overflow in check_and_correct_requested_length\n\ncheck_and_correct_requested_length() compares (off + len) against\nnode_size using u32 arithmetic.  When the caller passes a large len\nvalue (e.g. from an underflowed subtraction in hfs_brec_remove()),\noff + len can wrap past 2^32 and produce a small result, causing the\nbounds check to pass when it should fail.\n\nFor example, with off=14 and len=0xFFFFFFF2 (underflowed from\ndata_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6,\nwhich is less than a typical node_size of 512, so the check passes and\nthe subsequent memmove reads ~4GB past the node buffer.\n\nFix this by widening the addition to u64 before comparing against\nnode_size.  This prevents the u32 wrap while keeping the logic\nstraightforward.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}