CVE-2026-64360 — hfs/hfsplus: zero-initialize buffer in hfs_bnode_read
In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: zero-initialize buffer in hfs_bnode_read hfs_bnode_read() can return early without writing to the output buffer when is_bnode_offset_valid() fails or when check_and_correct_requested_ length() corrects the length to zero. Callers such as hfs_bnode_read_ u16() and hfs_bnode_read_u8() pass stack-allocated buffers and use the result unconditionally, leading to KMSAN uninit-value reports. Rather than initializing at each individual call site, zero the buffer at the start of hfs_bnode_read() before any validation checks. This ensures all callers in both hfs and hfsplus get a deterministic zero value regardless of which early-return path is taken.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.1% (30-day exploitation probability)+0
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
- Apply the fixed version or the patch documented under Remediation.
- Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux |
≥ a431930c9bac518bf99d6b1da526a7f37ddee8d8 and < f3461b84a4865d9b5e70fbb71da72ae044a3bcd2version 6.17≥ 6.16.2 and < 6.17≥ 6.15.11 and < 6.16≥ 5.4.297 and < 5.5≥ 6.12.43 and < 6.12.96≥ 6.6.103 and < 6.6.145≥ 6.1.149 and < 6.1.178 and 12 more≥ 5.15.190 and < 5.15.212≥ 5.10.241 and < 5.10.261version eec522fd0d28106b14a59ab2d658605febe4a3bbversion fc7f732984ec91f30be3e574e0644066d07f2b78version e7d2dc2421e821e4045775e6dc226378328de6f6≥ a431930c9bac518bf99d6b1da526a7f37ddee8d8 and < d67aadee19ffdf3cc8520c5a4f4d5b2916d30baf≥ a431930c9bac518bf99d6b1da526a7f37ddee8d8 and < d5b45bad75cd2730b8452aed4d3b20a2b2a12576≥ efc095b35b23297e419c2ab4fc1ed1a8f0781a29 and < d2afc7ecee476f9251dd87444f7fb6a424410922≥ 384a66b89f9540a9a8cb0f48807697dfabaece4c and < 16ca053c2be5f4f3044dccf7fc19237dc820d394≥ fe2891a9c43ab87d1a210d61e6438ca6936e2f62 and < 8f72fd25a57a457866350359ddd27a43caa62c95≥ a1a60e79502279f996e55052f50cc14919020475 and < 0b189b2204f1a2612dc68f8d139fb5b80539e710≥ 67ecc81f6492275c9c54280532f558483c99c90e and < 34684a04777358b2b40ac729e54c8e45359e46b3 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
| Linux | Linux Kernel |
≥ 5.4.297 and < 5.5≥ 6.19 and < 7.1.4≥ 6.16.2 and < 6.18.39≥ 6.15.11 and < 6.16≥ 6.12.43 and < 6.12.96≥ 6.6.103 and < 6.6.145≥ 6.1.149 and < 6.1.178≥ 5.15.190 and < 5.15.212 and 1 more≥ 5.10.241 and < 5.10.261 |
Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 5.5 | CVSS 3.1 | Medium | 1.8 | 3.6 | nvd@nist.gov via NIST National Vulnerability Database |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 15, 2026 → Oct 16, 2026 · 2 reading(s) · max 0.12%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
- Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · linux/linux
- Record published
- Fix documented
- CVSS changed · 5.5
- Source status changed · → Analyzed
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
8 on the record
- git.kernel.org/stable/c/16ca053c2be5f4f3044dccf7fc19237dc820d394
- git.kernel.org/stable/c/d5b45bad75cd2730b8452aed4d3b20a2b2a12576
- git.kernel.org/stable/c/d2afc7ecee476f9251dd87444f7fb6a424410922
- git.kernel.org/stable/c/8f72fd25a57a457866350359ddd27a43caa62c95
- git.kernel.org/stable/c/f3461b84a4865d9b5e70fbb71da72ae044a3bcd2
- git.kernel.org/stable/c/0b189b2204f1a2612dc68f8d139fb5b80539e710
- git.kernel.org/stable/c/34684a04777358b2b40ac729e54c8e45359e46b3
- git.kernel.org/stable/c/d67aadee19ffdf3cc8520c5a4f4d5b2916d30baf
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 1d
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 1d
- Unknown CVE-2026-98430 RDMA/efa: Keep admin queues alive while IRQ is registered 2d
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 2d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 2d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 2d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-64360 is "hfs/hfsplus: zero-initialize buffer in hfs_bnode_read", rated Medium. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.5 describes technical severity. EPSS 0.12% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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