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NVD / CVE Program· CNA Linux

CVE-2026-64360: hfs/hfsplus: zero-initialize buffer in hfs_bnode_read

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0b189b2204f1a2612dc68f8d139fb5b80539e710, 16ca053c2be5f4f3044dccf7fc19237dc820d394, 34684a04777358b2b40ac729e54c8e45359e46b3.

Low priority for now. Upgrade to Linux Linux 0b189b2204f1a2612dc68f8d139fb5b80539e710, 16ca053c2be5f4f3044dccf7fc19237dc820d394, 34684a04777358b2b40ac729e54c8e45359e46b3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 25, 2026
Updated
Sep 4, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-64360

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.4.297 and later · before 5.5
  • linux linux kernel5.10.241 and later · before 5.10.261
  • linux linux kernel5.15.190 and later · before 5.15.212
  • linux linux kernel6.1.149 and later · before 6.1.178
  • linux linux kernel6.6.103 and later · before 6.6.145
  • linux linux kernel6.12.43 and later · before 6.12.96
  • linux linux kernel6.15.11 and later · before 6.16
  • linux linux kernel6.16.2 and later · before 6.18.39
  • linux linux kernel6.19 and later · before 7.1.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • e7d2dc2421e821e4045775e6dc226378328de6f6, fc7f732984ec91f30be3e574e0644066d07f2b78, eec522fd0d28106b14a59ab2d658605febe4a3bb, 6.17affected
    • 67ecc81f6492275c9c54280532f558483c99c90e and later · before 34684a04777358b2b40ac729e54c8e45359e46b3affected · git
    • a1a60e79502279f996e55052f50cc14919020475 and later · before 0b189b2204f1a2612dc68f8d139fb5b80539e710affected · git
    • fe2891a9c43ab87d1a210d61e6438ca6936e2f62 and later · before 8f72fd25a57a457866350359ddd27a43caa62c95affected · git
    • 384a66b89f9540a9a8cb0f48807697dfabaece4c and later · before 16ca053c2be5f4f3044dccf7fc19237dc820d394affected · git
    • efc095b35b23297e419c2ab4fc1ed1a8f0781a29 and later · before d2afc7ecee476f9251dd87444f7fb6a424410922affected · git
    • a431930c9bac518bf99d6b1da526a7f37ddee8d8 and later · before f3461b84a4865d9b5e70fbb71da72ae044a3bcd2affected · git
    • a431930c9bac518bf99d6b1da526a7f37ddee8d8 and later · before d5b45bad75cd2730b8452aed4d3b20a2b2a12576affected · git
    • a431930c9bac518bf99d6b1da526a7f37ddee8d8 and later · before d67aadee19ffdf3cc8520c5a4f4d5b2916d30bafaffected · git
    • 5.10.241 and later · before 5.10.261affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:12linux-6.12before 6.12.100-1~deb12u16.12.100-1~deb12u1
Debian:13linuxbefore 6.12.96-16.12.96-1
Debian:14linuxbefore 7.1.4-17.1.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64358Jul 25, 2026 · media: mtk-jpeg: cancel workqueue on release for supported platforms only
    22Monitor
  • ← EarlierCVE-2026-64359Jul 25, 2026 · nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers
    22Monitor
  • Later →CVE-2026-64361Jul 25, 2026 · hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0b189b2204f1a2612dc68f8d139fb5b80539e710Vendor (CNA)
Linux Linux16ca053c2be5f4f3044dccf7fc19237dc820d394Vendor (CNA)
Linux Linux34684a04777358b2b40ac729e54c8e45359e46b3Vendor (CNA)
Linux Linux5.10.261Vendor (CNA)
Linux Linux5.15.212Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux6.1.178Vendor (CNA)
Linux Linux6.12.96Vendor (CNA)
Linux Linux6.16Vendor (CNA)
Linux Linux6.17Vendor (CNA)
Linux Linux6.6.145Vendor (CNA)
Linux Linux8f72fd25a57a457866350359ddd27a43caa62c95Vendor (CNA)
Linux Linuxd2afc7ecee476f9251dd87444f7fb6a424410922Vendor (CNA)
Linux Linuxd5b45bad75cd2730b8452aed4d3b20a2b2a12576Vendor (CNA)
Linux Linuxd67aadee19ffdf3cc8520c5a4f4d5b2916d30bafVendor (CNA)
Linux Linuxf3461b84a4865d9b5e70fbb71da72ae044a3bcd2Vendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-5298931 days apartnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
    39Monitor
  • CVE-2026-5322530 days apartsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
    36Monitor
  • CVE-2026-5317030 days apartaccel/ethosu: reject DMA commands with uninitialized length
    35Monitor
  • CVE-2026-4313980 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()
    34Monitor
  • CVE-2026-4329178 days apartnet: nfc: nci: Fix parameter validation for packet data
    33Monitor
  • CVE-2026-638706 days apartieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-908 · Use of Uninitialized Resource

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records