Cyber Resilience

CVE-2021-43267

Linux Kernel 5.10 – 5.10.77

Public PoCHigh EPSS
Published
02 November 2021
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.58 99th percentile
Risk Priority 97 floored blend · peak EPSS

Summary

CVE-2021-43267 is a critical-severity Improper Validation of Specified Quantity in Input (CWE-1284) vulnerability in Linux Linux Kernel. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability Data

An issue was discovered in net/tipc/crypto.c in the Linux kernel before 5.14.16. The Transparent Inter-Process Communication (TIPC) functionality allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.

CWE(s)
CWE-1284

Related Threats

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1190 Exploit Public-Facing Application Initial Accessconfidence: HIGH
Remote exploitation of TIPC MSG_CRYPTO message size validation flaw enables initial access via public-facing network service.
attack.mitre.org →
T1055 Process Injection Stealthconfidence: MEDIUM
Out-of-bounds memory corruption from malformed crypto message sizes can be leveraged for process injection or arbitrary code execution.
attack.mitre.org →
inferred from description + CWE · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2022-0185Same product: Linux Linux Kernel
CVE-2023-2269Same product: Fedoraproject Fedora
CVE-2023-33250Same product: Linux Linux Kernel
CVE-2023-40791Same product: Linux Linux Kernel
CVE-2023-4273Same product: Fedoraproject Fedora
CVE-2023-32252Same product: Linux Linux Kernel
CVE-2023-3212Same product: Fedoraproject Fedora
CVE-2024-36958Same product: Linux Linux Kernel
CVE-2023-35001Same product: Fedoraproject Fedora
CVE-2022-0435Same product: Fedoraproject Fedora

Affected Assets

linux
linux kernel
5.10 — 5.10.77 · 5.11 — 5.14.16
fedoraproject
fedora
34, 35
netapp
h300s firmware
all versions
netapp
h500s firmware
all versions
netapp
h700s firmware
all versions
netapp
h300e firmware
all versions
netapp
h500e firmware
all versions
netapp
h700e firmware
all versions
netapp
h410s firmware
all versions

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V6.7.2
  • V1.4.2
  • V2.1.1
  • V2.2.1

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require proper quantity/length validation in input handling.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing in development can detect missing quantity validation but does not itself implement the control.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle mandates input validation for quantity fields, directly preventing CWE-1284.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for validation of size/length inputs, mitigating CWE-1284.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles encourage robust input handling but do not specifically address quantity validation.

A.8.28 Secure coding partial match
prevents

Secure coding standards require explicit checks on numeric quantity inputs, fully addressing CWE-1284.

References