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NVD / CVE Program· CNA Linux

CVE-2021-47404: HID: betop: fix slab-out-of-bounds Write in betop_probe

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: 0.26% (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 1c83c38dec83d57bc18d0c01d82c413d3b34ccb9, 1e4ce418b1cb1a810256b5fb3fd33d22d1325993, 6fc4476dda58f6c00097c7ddec3b772513f57525.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1c83c38dec83d57bc18d0c01d82c413d3b34ccb9, 1e4ce418b1cb1a810256b5fb3fd33d22d1325993, 6fc4476dda58f6c00097c7ddec3b772513f57525 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: HID: betop: fix slab-out-of-bounds Write in betop_probe Syzbot reported slab-out-of-bounds Write bug in hid-betopff driver. The problem is the driver assumes the device must have an input report but some malicious devices violate this assumption. So this patch checks hid_device's input is non empty before it's been used.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 21, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 17th 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 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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-2021-47404

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 kernelbefore 4.4.286
  • linux linux kernel4.5 and later · before 4.9.285
  • linux linux kernel4.10 and later · before 4.14.249
  • linux linux kernel4.15 and later · before 4.19.209
  • linux linux kernel4.20 and later · before 5.4.151
  • linux linux kernel5.5 and later · before 5.10.71
  • linux linux kernel5.11 and later · before 5.14.10
  • linux linux kernel5.15

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

    • 4.0affected
    • 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4 and later · before a4faa7153b87fbcfe4be15f4278676f79ca6e019affected · git
    • 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4 and later · before 6fc4476dda58f6c00097c7ddec3b772513f57525affected · git
    • 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4 and later · before 1c83c38dec83d57bc18d0c01d82c413d3b34ccb9affected · git
    • 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4 and later · before bb8b72374db69afa25a5b65cf1c092860c6fe914affected · git
    • 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4 and later · before fe9bb925e7096509711660d39c0493a1546e9550affected · git
    • 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4 and later · before dedfc35a2de2bae9fa3da8210a05bfd515f83feeaffected · git
    • 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4 and later · before 708107b80aa616976d1c5fa60ac0c1390749db5eaffected · git
    • 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4 and later · before 1e4ce418b1cb1a810256b5fb3fd33d22d1325993affected · git
    • before 4.0not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.12-15.14.12-1

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-2021-47402May 21, 2024 · net: sched: flower: protect fl_walk() with rcu
    31Monitor
  • ← EarlierCVE-2021-47403May 21, 2024 · ipack: ipoctal: fix module reference leak
    28Monitor
  • Later →CVE-2021-47405May 21, 2024 · HID: usbhid: free raw_report buffers in usbhid_stop
    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 Linux1c83c38dec83d57bc18d0c01d82c413d3b34ccb9Vendor (CNA)
Linux Linux1e4ce418b1cb1a810256b5fb3fd33d22d1325993Vendor (CNA)
Linux Linux6fc4476dda58f6c00097c7ddec3b772513f57525Vendor (CNA)
Linux Linux708107b80aa616976d1c5fa60ac0c1390749db5eVendor (CNA)
Linux Linuxa4faa7153b87fbcfe4be15f4278676f79ca6e019Vendor (CNA)
Linux Linuxbb8b72374db69afa25a5b65cf1c092860c6fe914Vendor (CNA)
Linux Linuxdedfc35a2de2bae9fa3da8210a05bfd515f83feeVendor (CNA)
Linux Linuxfe9bb925e7096509711660d39c0493a1546e9550Vendor (CNA)
debian:linux5.14.12-1 · 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.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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-787 · Out-of-bounds Write

CVSS vector

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