CVE-2021-47522: HID: bigbenff: prevent null pointer dereference
Vulnerability summary
CVE-2021-47522 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 8Timeline
- 24-05-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: HID: bigbenff: prevent null pointer dereference When emulating the device through uhid, there is a chance we don't have output reports and so report_field is null.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.24%
Chance of exploitation in the next 30 days
Percentile
15%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.24% 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.
Ubuntu84 products
- linux< 5.4.0-100.113
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.4.0-1066.69
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 256a90ed9e46b270bbc4e15ef05216ff049c3721, < 8e0ceff632f48175ec7fb4706129c55ca8a7c7bd | ≥ 256a90ed9e46b270bbc4e15ef05216ff049c3721, < 6272b17001e6fdcf7b4a16206287010a1523fa6e | ≥ 256a90ed9e46b270bbc4e15ef05216ff049c3721, < 58f15f5ae7786c824868f3a7e093859b74669ce7 | ≥ 256a90ed9e46b270bbc4e15ef05216ff049c3721, < 918aa1ef104d286d16b9e7ef139a463ac7a296f0 | 4.20
- linux_kernel< 5.4.165 | ≥ 5.5, < 5.10.85 | ≥ 5.11, < 5.15.8
Debian1 product
- linux< 5.15.15-1
3 vendors · 87 products
