PT-2026-39118 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-21 · CVE-2026-43457

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A memory leak occurs in the Linux kernel within the MCTP (Management Component Transport Protocol) I2C receive path. When the midev->allow rx variable is set to false, the newly allocated skb (socket buffer, a data structure used for network packets) is not consumed by the netif rx() function, leading to a failure to free the memory directly.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

CVE-2026-43457

Affected Products

Linux Kernel

References · 17

• https://git.kernel.org/stable/c/d7900a43b0a314a645ca0a2adf45928dbc7001f4 · Patch
• https://cve.org/CVERecord?id=CVE-2026-43457 · Security Note
• https://git.kernel.org/stable/c/0fb2adbdd5c03e8c9ebcdc48afd414b2724c85eb · Patch
• https://ubuntu.com/security/CVE-2026-43457 · Vendor Advisory
• https://git.kernel.org/stable/c/1b1be322342a6b0085bf6ee52235e5ac9834ec25 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43457 · Security Note
• https://git.kernel.org/stable/c/1ec54187e1aa40a4cfa2b265e9a311179f24b98d · Patch
• https://git.kernel.org/stable/c/e3f5e0f22cfc2371e7471c9fd5b4da78f9df7c69 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43457 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43457 · Vendor Advisory
• https://git.kernel.org/stable/c/9f81be2ab9d8e4744871bfb3e868ef413413829f · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43457 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43457 · Vendor Advisory
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://twitter.com/CVEnew/status/2052767607703711986 · Twitter Post