CVE-2021-4204: debian debian_linux Improper Input Validation
Vulnerability summary
CVE-2021-4204 is a high (CVSS 7.1) Improper Input Validation vulnerability in debian debian_linux. EPSS estimates a 1.24% chance of exploitation in the next 30 days, higher than 69.3% of scored vulnerabilities.
Not severe (CVSS 7.1, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 10 · Related 5Timeline
- 24-08-2022PublishedVulnerability first disclosed.
- 02-11-2026Last modifiedVulnerability information updated.
Description
An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
1.24%
Chance of exploitation in the next 30 days
Percentile
69%
Versus all other CVEs
30-day change
Increase +0.02 pp
From 1.22% 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 cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu38 products
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11< 5.11.0-1025.27~20.04.1
- linux-aws-5.13< 5.13.0-1011.12~20.04.1
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.8All versions (No fix recorded)
Netapp5 products
Debian2 products
- linux< 5.17.3-1
- debian_linuxEOL11.0
Linux1 product
- linux_kernel< 5.8.0 | 5.8.0
Redhat1 product
5 vendors · 47 products
References
12 links
- security.netapp.com/advisory/ntap-20221228-0003/Third Party Advisory