CVE-2021-3411Public exploit

System crash via misclassified INT3 linker padding

Published Mar 9, 2021 · Updated Aug 3, 2024

Memory access violation in The Linux Kernel Organization Linux Kernel before 5.10 allows local users with high privileges to crash the system. The x86 kprobes can_optimize function treats linker-generated INT3 padding as an unrelated breakpoint instead of verifying the remaining function bytes, disrupting optimized probe handling. Triggering the flaw requires high local privileges and the affected x86 kprobes path; consequences are a system crash or sensitive-data exposure.

CVSS severity6.7
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory access violation in The Linux Kernel Organization Linux Kernel before 5.10 allows local users with high privileges to crash the system. The x86 kprobes can_optimize function treats linker-generated INT3 padding as an unrelated breakpoint instead of verifying the remaining function bytes, disrupting optimized probe handling. Triggering the flaw requires high local privileges and the affected x86 kprobes path; consequences are a system crash or sensitive-data exposure.

The record

CVE
CVE-2021-3411
Published
Mar 9, 2021
Updated
Aug 3, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-94, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Linux kernel 5.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux kernel 5.10

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo