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NVD / CVE Program· CNA Linux

CVE-2026-43343: usb: gadget: f_subset: Fix unbalanced refcnt in geth_free

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: 0.11% (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 23e4851ce348a329d974e84e828155dda9f52122, 3d436670b47415da042452618fb5d8e317ab095f, 3f5bfc550a40d7493b1cf09540ed6b412b3b82be.

Low priority for now. Upgrade to Linux Linux 23e4851ce348a329d974e84e828155dda9f52122, 3d436670b47415da042452618fb5d8e317ab095f, 3f5bfc550a40d7493b1cf09540ed6b412b3b82be 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: gadget: f_subset: Fix unbalanced refcnt in geth_free geth_alloc() increments the reference count, but geth_free() fails to decrement it. This prevents the configuration of attributes via configfs after unlinking the function. Decrement the reference count in geth_free() to ensure proper cleanup.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 8, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 1th 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 kernel3.11 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

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

    • 3.11affected
    • 02832e56f88a981474ee4c7c141f46fc1b4454f4 and later · before a932b171554714b1bca313b853c7aa9f2930f9aaaffected · git
    • 02832e56f88a981474ee4c7c141f46fc1b4454f4 and later · before d7d702407b61e96286a15b6e715572f541a8d41caffected · git
    • 02832e56f88a981474ee4c7c141f46fc1b4454f4 and later · before 3f5bfc550a40d7493b1cf09540ed6b412b3b82beaffected · git
    • 02832e56f88a981474ee4c7c141f46fc1b4454f4 and later · before 75776a055b656873319c3830fed471daef3ceb23affected · git
    • 02832e56f88a981474ee4c7c141f46fc1b4454f4 and later · before cc8ec610cd14c093a19371691a7ce1ee5421e829affected · git
    • 02832e56f88a981474ee4c7c141f46fc1b4454f4 and later · before 3d436670b47415da042452618fb5d8e317ab095faffected · git
    • 02832e56f88a981474ee4c7c141f46fc1b4454f4 and later · before 23e4851ce348a329d974e84e828155dda9f52122affected · git
    • 02832e56f88a981474ee4c7c141f46fc1b4454f4 and later · before caa27923aacd8a5869207842f2ab1657c6c0c7bcaffected · git
    • before 3.11not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

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-2026-43340May 8, 2026 · comedi: Reinit dev->spinlock between attachments to low-level drivers
    22Monitor
  • ← EarlierCVE-2026-43342May 8, 2026 · usb: gadget: f_rndis: Protect RNDIS options with mutex
    18Monitor
  • Later →CVE-2026-43344May 8, 2026 · perf/x86/intel/uncore: Fix die ID init and look up bugs
    22Monitor

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 Linux23e4851ce348a329d974e84e828155dda9f52122Vendor (CNA)
Linux Linux3d436670b47415da042452618fb5d8e317ab095fVendor (CNA)
Linux Linux3f5bfc550a40d7493b1cf09540ed6b412b3b82beVendor (CNA)
Linux Linux75776a055b656873319c3830fed471daef3ceb23Vendor (CNA)
Linux Linuxa932b171554714b1bca313b853c7aa9f2930f9aaVendor (CNA)
Linux Linuxcaa27923aacd8a5869207842f2ab1657c6c0c7bcVendor (CNA)
Linux Linuxcc8ec610cd14c093a19371691a7ce1ee5421e829Vendor (CNA)
Linux Linuxd7d702407b61e96286a15b6e715572f541a8d41cVendor (CNA)
debian:linux6.1.170-1 · 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