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NVD / CVE Program· CNA Linux

CVE-2026-64338: USB: misc: uss720: unregister parport on probe failure

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 0b3073f40cc9f95d5ff0037eb0a06f5c1725a7ea, 1712fd71a5aaf81e47c747f180535fa963ad7830, 4.20.

Low priority for now. Upgrade to Linux Linux 0b3073f40cc9f95d5ff0037eb0a06f5c1725a7ea, 1712fd71a5aaf81e47c747f180535fa963ad7830, 4.20 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: USB: misc: uss720: unregister parport on probe failure uss720_probe() registers a parport before reading the 1284 register used to detect unsupported Belkin F5U002 adapters. If get_1284_register() fails, the error path drops the driver private data and the USB device reference, but leaves the parport device registered. Leaving the port registered is more than a private allocation leak: parport_register_port() has already reserved a parport number and registered the parport bus device, while pp->private_data still points at the private data that the common error path is about to release. Undo the pre-announce registration in the get_1284_register() failure branch before jumping to the common private-data cleanup path. Clear priv->pp first, matching the disconnect path and avoiding a stale pointer in the private data. This issue was identified during our ongoing static-analysis research while reviewing kernel code.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 25, 2026
Updated
Sep 3, 2026
EPSS
0.1% · 2th percentile
CWE
—

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.

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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 kernel4.19.317 and later · before 4.20
  • linux linux kernel5.4.279 and later · before 5.5
  • linux linux kernel5.10.221 and later · before 5.10.261
  • linux linux kernel5.15.162 and later · before 5.15.212
  • linux linux kernel6.1.96 and later · before 6.1.178
  • linux linux kernel6.6.36 and later · before 6.6.145
  • linux linux kernel6.9.7 and later · before 6.12.96
  • linux linux kernel6.13 and later · before 6.18.39
  • linux linux kernel6.19 and later · before 7.1.4
  • linux linux kernel7.2

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

    • 02d13616ca30014ed96302e51a5b0e17664e58bc, dff3b01e91a3df93063b03d0f8dd5c40546687ec, 489d77fbd66375972a380d207f7eb39b00c4a67b, 6.10affected
    • 04736c1bc32197f7d859e01a96ae80a16659931d and later · before 6bbb98bec71b577fda4f4b48f7aea5874b04a576affected · git
    • 4eaf2331a77996bbbaf2b824d452ac8ebda7e6e7 and later · before 93563243377f8e9b46cc94d9c4f06533dd31b141affected · git
    • 8fc246a8a456679993df565d3c9e3da28030ee43 and later · before 1712fd71a5aaf81e47c747f180535fa963ad7830affected · git
    • 10132ccf99f49b43aeb7470df50d72344a601ad6 and later · before 0b3073f40cc9f95d5ff0037eb0a06f5c1725a7eaaffected · git
    • 3295f1b866bfbcabd625511968e8a5c541f9ab32 and later · before 5e62d7857fd51b908b8371062ee839739a086bbeaffected · git
    • 3295f1b866bfbcabd625511968e8a5c541f9ab32 and later · before 729b68a5bad71220ae0914c8bdab9488ad5be6c8affected · git
    • 3295f1b866bfbcabd625511968e8a5c541f9ab32 and later · before 48dd0b2ec9f2e97c486eb68cd0a64b25c1c3df3eaffected · git
    • 3295f1b866bfbcabd625511968e8a5c541f9ab32 and later · before b4ecbdc4f8830f5586c4a5cfc384c00f20f8f8b3affected · git
    • 5.10.221 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-2026-64336Jul 25, 2026 · USB: serial: keyspan_pda: fix information leak
    22Monitor
  • ← EarlierCVE-2026-64337Jul 25, 2026 · usb: mtu3: unmap request DMA on queue failure
    22Monitor
  • Later →CVE-2026-64339Jul 25, 2026 · usb: misc: usbio: bound bulk IN response length to the received transfer
    28Monitor

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 Linux0b3073f40cc9f95d5ff0037eb0a06f5c1725a7eaVendor (CNA)
Linux Linux1712fd71a5aaf81e47c747f180535fa963ad7830Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux48dd0b2ec9f2e97c486eb68cd0a64b25c1c3df3eVendor (CNA)
Linux Linux5.10.261Vendor (CNA)
Linux Linux5.15.212Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5e62d7857fd51b908b8371062ee839739a086bbeVendor (CNA)
Linux Linux6.1.178Vendor (CNA)
Linux Linux6.10Vendor (CNA)
Linux Linux6.6.145Vendor (CNA)
Linux Linux6bbb98bec71b577fda4f4b48f7aea5874b04a576Vendor (CNA)
Linux Linux729b68a5bad71220ae0914c8bdab9488ad5be6c8Vendor (CNA)
Linux Linux93563243377f8e9b46cc94d9c4f06533dd31b141Vendor (CNA)
Linux Linuxb4ecbdc4f8830f5586c4a5cfc384c00f20f8f8b3Vendor (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.

No nightly-computed relations.

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)

—

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