Cyber Resilience

CVE-2023-1076

Memory Safety in Linux Kernel

Memory Safety
Published
27 March 2023
Modified
24 February 2025
Patch / advisory
View advisory
CVSS Score v3.1 5.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS Score 0.0026 17th percentile
Risk Priority 42 floored blend · peak EPSS

Summary

CVE-2023-1076 is a medium-severity Incomplete Filtering of Special Elements (CWE-791) vulnerability in Linux Linux Kernel. Its CVSS base score is 5.5 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 17th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAP_NET_ADMIN, it may…

more

not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters.

CWE(s)
CWE-791CWE-843

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-3022Same product: Linux Linux Kernel
CVE-2024-49860Same product: Linux Linux Kernel
CVE-2026-31502Same product: Linux Linux Kernel
CVE-2023-1078Same product: Linux Linux Kernel
CVE-2026-43037Same product: Linux Linux Kernel
CVE-2024-47748Same product: Linux Linux Kernel
CVE-2023-1118Same product: Linux Linux Kernel
CVE-2024-43900Same product: Linux Linux Kernel
CVE-2023-1195Same product: Linux Linux Kernel
CVE-2024-35986Same product: Linux Linux Kernel

Affected Assets

linux
linux kernel
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)
  • V1.5.2
  • V3.2.3
  • V15.3.5

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 complete input filtering and sanitization to prevent this weakness.

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
finds

Security testing in development and acceptance can detect incomplete filtering but does not itself implement the filtering.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle processes include validation activities that reduce the likelihood of CWE-791 but do not specify the control itself.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for input validation and sanitization that directly mitigates incomplete special-element filtering.

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

Secure system architecture and engineering principles require defensive design patterns that prevent unfiltered data from reaching downstream components.

A.8.28 Secure coding partial match
prevents

Secure coding standards mandate complete filtering and escaping of special elements, directly eliminating CWE-791.

References