Security Resilience

CVE-2026-43457

Linux Kernel 5.18 – 6.1.167

Published
08 May 2026
Modified
17 June 2026
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:N/A:H
EPSS Score 0.0016 5th percentile
Risk Priority 41 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-43457 is a medium-severity Missing Release of Memory after Effective Lifetime (CWE-401) vulnerability in Linux Linux Kernel. Its CVSS base score is 5.5 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked at the 5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-15 (Development Process, Standards, and Tools) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

In the Linux kernel, the following vulnerability has been resolved: mctp: i2c: fix skb memory leak in receive path When 'midev->allow_rx' is false, the newly allocated skb isn't consumed by netif_rx(), it needs to free the skb directly.

CWE(s)
CWE-401

Related Threats

MITRE ATT&CK Enterprise Techniques

T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-14027Same product: Linux Linux Kernel
CVE-2026-45928Same product: Linux Linux Kernel
CVE-2023-53674Same product: Linux Linux Kernel
CVE-2024-53210Same product: Linux Linux Kernel
CVE-2026-45948Same product: Linux Linux Kernel
CVE-2023-53190Same product: Linux Linux Kernel
CVE-2023-53002Same product: Linux Linux Kernel
CVE-2024-41021Same product: Linux Linux Kernel
CVE-2025-22005Same product: Linux Linux Kernel
CVE-2026-31604Same product: Linux Linux Kernel

Affected Assets

linux
linux kernel
7.0 · 5.18 — 6.1.167 · 6.2 — 6.6.130 · 6.7 — 6.12.78

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation (static analysis, fuzzing, or runtime leak detection) directly finds missing deallocation.

SA-15 Development Process, Standards, and Tools partial match

Requiring documented development standards and tools can mandate memory-management disciplines that avoid leaks at introduction.

SA-8 Security and Privacy Engineering Principles partial match

Engineering principles applied during development can require explicit resource-release patterns that stop memory leaks from being coded.

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
blocks

Secure SDLC practices directly enforce proper memory allocation/deallocation via coding standards, reviews, and tooling.

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 can detect unreleased memory, providing partial coverage of the weakness.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require proper allocation/deallocation, covering most of this weakness.

A.8.6 Capacity management partial match
finds

Capacity management may detect memory exhaustion symptoms but does not prevent the coding flaw.

References