CVE-2021-47404: HID: betop: fix slab-out-of-bounds Write in betop_probe
Vulnerability summary
CVE-2021-47404 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.9% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 11 · Related 11Timeline
- 21-05-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
18%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.26% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu88 products
- linuxAll versions (No fix recorded) | < 4.15.0-163.171 | < 5.4.0-91.102
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1116.123 | < 5.4.0-1060.63
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4, < a4faa7153b87fbcfe4be15f4278676f79ca6e019 | ≥ 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4, < 6fc4476dda58f6c00097c7ddec3b772513f57525 | ≥ 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4, < 1c83c38dec83d57bc18d0c01d82c413d3b34ccb9 | ≥ 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4, < bb8b72374db69afa25a5b65cf1c092860c6fe914 | ≥ 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4, < fe9bb925e7096509711660d39c0493a1546e9550 | ≥ 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4, < dedfc35a2de2bae9fa3da8210a05bfd515f83fee | ≥ 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4, < 708107b80aa616976d1c5fa60ac0c1390749db5e | ≥ 52cd7785f3cdd2724f4efb5b21dbc75d6f9ccef4, < 1e4ce418b1cb1a810256b5fb3fd33d22d1325993 | 4.0
- linux_kernel< 4.4.286 | ≥ 4.5, < 4.9.285 | ≥ 4.10, < 4.14.249 | ≥ 4.15, < 4.19.209 | ≥ 4.20, < 5.4.151 | ≥ 5.5, < 5.10.71 | ≥ 5.11, < 5.14.10 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3
Debian1 product
- linux< 5.14.12-1
3 vendors · 91 products
