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NVD / CVE Program· CNA Linux

CVE-2026-64361: hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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 5.10.261, 5.15.212, 5.5.

Low priority for now. Upgrade to Linux Linux 5.10.261, 5.15.212, 5.5 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: 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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jul 25, 2026
Updated
Sep 4, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • 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.

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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 6.12.97
  • linux linux kernel6.15.11 and later · before 6.16
  • linux linux kernel6.16.2 and later · before 6.18.40
  • 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 c8dd112173c02adf539fe2ad34a45f5e0068780daffected · git
    • a1a60e79502279f996e55052f50cc14919020475 and later · before fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1affected · git
    • fe2891a9c43ab87d1a210d61e6438ca6936e2f62 and later · before 671c3fcc2ad31c1311ea6414382a2d95104ae1b9affected · git
    • 384a66b89f9540a9a8cb0f48807697dfabaece4c and later · before b6a481642ea1977be2f84dc08c5affd742c177e7affected · git
    • efc095b35b23297e419c2ab4fc1ed1a8f0781a29 and later · before 7399c3baee7bb622a92f0b895cd4d3009a693f2baffected · git
    • a431930c9bac518bf99d6b1da526a7f37ddee8d8 and later · before 607217f7ad419b53926f71e3f75001813bbc08adaffected · git
    • a431930c9bac518bf99d6b1da526a7f37ddee8d8 and later · before c25d3c931a63e762fcaa9cb125b901c53b62403faffected · git
    • a431930c9bac518bf99d6b1da526a7f37ddee8d8 and later · before 966cb76fb2857a4242cab6ea2ea17acf818a3da7affected · 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 6.12.100-16.12.100-1
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-2026-64359Jul 25, 2026 · nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers
    22Monitor
  • ← EarlierCVE-2026-64360Jul 25, 2026 · hfs/hfsplus: zero-initialize buffer in hfs_bnode_read
    22Monitor
  • Later →CVE-2026-64367Jul 25, 2026 · HID: hid-goodix-spi: validate report size to prevent stack buffer overflow
    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 Linux5.10.261Vendor (CNA)
Linux Linux5.15.212Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux6.1.178Vendor (CNA)
Linux Linux6.12.97Vendor (CNA)
Linux Linux6.16Vendor (CNA)
Linux Linux6.17Vendor (CNA)
Linux Linux6.6.145Vendor (CNA)
Linux Linux607217f7ad419b53926f71e3f75001813bbc08adVendor (CNA)
Linux Linux671c3fcc2ad31c1311ea6414382a2d95104ae1b9Vendor (CNA)
Linux Linux7399c3baee7bb622a92f0b895cd4d3009a693f2bVendor (CNA)
Linux Linux966cb76fb2857a4242cab6ea2ea17acf818a3da7Vendor (CNA)
Linux Linuxb6a481642ea1977be2f84dc08c5affd742c177e7Vendor (CNA)
Linux Linuxc25d3c931a63e762fcaa9cb125b901c53b62403fVendor (CNA)
Linux Linuxc8dd112173c02adf539fe2ad34a45f5e0068780dVendor (CNA)
Linux Linuxfc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1Vendor (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-2026-5317630 days apartIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
    39Monitor
  • CVE-2026-639406 days apartKVM: SEV: Ignore Port I/O requests of length '0'
    37Monitor
  • CVE-2026-4318780 days apartxfs: delete attr leaf freemap entries when empty
    35Monitor
  • CVE-2026-5317830 days apartstaging: rtl8723bs: rtw_mlme: add bounds checks before ie_length subtraction
    32Monitor
  • CVE-2026-5291931 days apartbatman-adv: fix tp_meter counter underflow during shutdown
    31Monitor
  • CVE-2026-5313031 days apartfs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START
    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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-191 · Integer Underflow (Wrap or Wraparound)

CVSS vector

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

nvd-secondary

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