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NVD / CVE Program· CNA Linux

CVE-2026-31606: usb: gadget: f_hid: don't call cdev_init while cdev in use

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: 0.15% (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 3aa77f5da0ecb00895411f4246d8a3e4db0343c2, 5a229016ca3ac551294ec59770be9da94ec4bf63, 75ecc46828ec377dd5692c677168ef6d64fd7123; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 3aa77f5da0ecb00895411f4246d8a3e4db0343c2, 5a229016ca3ac551294ec59770be9da94ec4bf63, 75ecc46828ec377dd5692c677168ef6d64fd7123; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes 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_hid: don't call cdev_init while cdev in use When calling unbind, then bind again, cdev_init reinitialized the cdev, even though there may still be references to it. That's the case when the /dev/hidg* device is still opened. This obviously unsafe behavior like oopes. This fixes this by using cdev_alloc to put the cdev on the heap. That way, we can simply allocate a new one in hidg_bind.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 24, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 4th 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.

Follow CVE-2026-31606

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 kernel3.19 and later · before 6.12.83
  • linux linux kernel6.13 and later · before 6.18.24
  • linux linux kernel6.19 and later · before 6.19.14
  • linux linux kernel7.0 and later · before 7.0.1

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

    • 3.19affected
    • cb382536052fcc7713988869b54a81137069e5a9 and later · before 92f23ab86d9524bc51dae25ed916d0e69dce5992affected · git
    • cb382536052fcc7713988869b54a81137069e5a9 and later · before 3aa77f5da0ecb00895411f4246d8a3e4db0343c2affected · git
    • cb382536052fcc7713988869b54a81137069e5a9 and later · before c6c0d13db5d0f8d465eabc14bd23d2b6a7247a43affected · git
    • cb382536052fcc7713988869b54a81137069e5a9 and later · before eb6ef6185f2054a341ec70d7e2165f5381744215affected · git
    • cb382536052fcc7713988869b54a81137069e5a9 and later · before 5a229016ca3ac551294ec59770be9da94ec4bf63affected · git
    • cb382536052fcc7713988869b54a81137069e5a9 and later · before 75ecc46828ec377dd5692c677168ef6d64fd7123affected · git
    • cb382536052fcc7713988869b54a81137069e5a9 and later · before 81ebd43cc0d6d106ce7b6ccbf7b5e40ca7f5503daffected · git
    • before 3.19not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.14-16.19.14-1

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-2026-31600Apr 24, 2026 · arm64: mm: Handle invalid large leaf mappings correctly
    30Monitor
  • ← EarlierCVE-2026-31604Apr 24, 2026 · wifi: rtw88: fix device leak on probe failure
    22Monitor
  • Later →CVE-2026-31607Apr 24, 2026 · usbip: validate number_of_packets in usbip_pack_ret_submit()
    39Monitor

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 Linux3aa77f5da0ecb00895411f4246d8a3e4db0343c2Vendor (CNA)
Linux Linux5a229016ca3ac551294ec59770be9da94ec4bf63Vendor (CNA)
Linux Linux75ecc46828ec377dd5692c677168ef6d64fd7123Vendor (CNA)
Linux Linux81ebd43cc0d6d106ce7b6ccbf7b5e40ca7f5503dVendor (CNA)
Linux Linux92f23ab86d9524bc51dae25ed916d0e69dce5992Vendor (CNA)
Linux Linuxc6c0d13db5d0f8d465eabc14bd23d2b6a7247a43Vendor (CNA)
Linux Linuxeb6ef6185f2054a341ec70d7e2165f5381744215Vendor (CNA)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0Release NotesMicrosoft (MSRC)
debian:linux6.12.85-1 · Debian:13Package 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.

No history yet (it accumulates with the daily EPSS job).

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 (6 more)

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

All records