CVE-2026-64361: hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length
Vulnerability summary
CVE-2026-64361 is a high (CVSS 7.8) Integer Underflow (Wrap or Wraparound) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 23 · Related 21Timeline
- 25-07-2026PublishedVulnerability first disclosed.
- 17-08-2026Last modifiedVulnerability information updated.
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 metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.13%
Chance of exploitation in the next 30 days
Percentile
3%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.13% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.4-1
- linux-6.12< 6.12.100-1~deb12u1
Linux2 products
- 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 | 6.17
- linux_kernel≥ 5.4.297, < 5.5 | ≥ 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 | ≥ 6.15.11, < 6.16 | ≥ 6.16.2, < 6.18.40 | ≥ 6.19, < 7.1.4
3 vendors · 161 products
