PT-2026-37592 · Linux+3 · Linux+128

Published 2026-05-06 · Updated 2026-05-07 · CVE-2026-43252

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 An issue exists in the Multipath TCP (MPTCP) path manager where the kernel fails to consistently set the ID as available when removing an endpoint. This can be triggered by specific sequences of actions, leading to kernel warnings in functions such as mark subflow endp available(), mptcp pm nl fullmesh(), mptcp pm nl set flags all(), and mptcp pm nl set flags().

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

Improper Locking

Weakness Enumeration

CWE-667

Related Identifiers

CVE-2026-43252

Affected Products

Linux

Linux-Allwinner-5.19

Linux-Aws

Linux-Aws-5.0

Linux-Aws-5.11

Linux-Aws-5.13

Linux-Aws-5.19

Linux-Aws-5.3

Linux-Aws-5.8

Linux-Aws-6.14

Linux-Aws-6.17

Linux-Aws-6.2

Linux-Aws-6.5

Linux-Aws-6.8

Linux-Aws-Fips

Linux-Azure

Linux-Azure-5.11

Linux-Azure-5.13

Linux-Azure-5.19

Linux-Azure-5.3

Linux-Azure-5.8

Linux-Azure-6.11

Linux-Azure-6.14

Linux-Azure-6.17

Linux-Azure-6.2

Linux-Azure-6.5

Linux-Azure-6.8

Linux-Azure-Edge

Linux-Azure-Fde

Linux-Azure-Fde-5.19

Linux-Azure-Fde-6.14

Linux-Azure-Fde-6.17

Linux-Azure-Fde-6.2

Linux-Azure-Fde-6.8

Linux-Azure-Fips

Linux-Azure-Nvidia

Linux-Azure-Nvidia-6.14

Linux-Fips

Linux-Gcp

Linux-Gcp-5.11

Linux-Gcp-5.13

Linux-Gcp-5.19

Linux-Gcp-5.3

Linux-Gcp-5.8

Linux-Gcp-6.11

Linux-Gcp-6.14

Linux-Gcp-6.17

Linux-Gcp-6.2

Linux-Gcp-6.5

Linux-Gcp-6.8

Linux-Gcp-Fips

Linux-Gke

Linux-Gke-4.15

Linux-Gkeop-5.15

Linux-Gke-5.4

Linux-Gkeop

Linux-Hwe

Linux-Hwe-5.11

Linux-Hwe-5.13

Linux-Hwe-5.19

Linux-Hwe-5.8

Linux-Hwe-6.11

Linux-Hwe-6.14

Linux-Hwe-6.17

Linux-Hwe-6.2

Linux-Hwe-6.5

Linux-Hwe-6.8

Linux-Hwe-Edge

Linux-Ibm

Linux-Ibm-6.8

Linux-Intel-5.13

Linux-Intel-Iot-Realtime

Linux-Lowlatency

Linux-Lowlatency-Hwe-5.19

Linux-Lowlatency-Hwe-6.11

Linux-Lowlatency-Hwe-6.2

Linux-Lowlatency-Hwe-6.5

Linux-Lowlatency-Hwe-6.8

Linux-Lts

Linux-Nvidia

Linux-Nvidia-6.11

Linux-Nvidia-6.2

Linux-Nvidia-6.5

Linux-Nvidia-6.8

Linux-Nvidia-Lowlatency

Linux-Nvidia-Tegra

Linux-Oem

Linux-Oem-5.10

Linux-Oem-5.13

Linux-Oem-5.14

Linux-Oem-5.17

Linux-Oem-5.6

Linux-Oem-6.0

Linux-Oem-6.1

Linux-Oem-6.11

Linux-Oem-6.14

Linux-Oem-6.17

Linux-Oem-6.5

Linux-Oem-6.8

Linux-Oracle

Linux-Oracle-5.0

Linux-Oracle-5.11

Linux-Oracle-5.13

Linux-Oracle-5.3

Linux-Oracle-5.8

Linux-Oracle-6.14

Linux-Oracle-6.17

Linux-Oracle-6.5

Linux-Oracle-6.8

Linux-Raspi

Linux-Raspi-Realtime

Linux-Raspi2

Linux-Realtime

Linux-Realtime-6.14

Linux-Realtime-6.17

Linux-Realtime-6.8

Linux-Riscv

Linux-Riscv-5.11

Linux-Riscv-5.19

Linux-Riscv-5.8

Linux-Riscv-6.14

Linux-Riscv-6.17

Linux-Riscv-6.5

Linux-Riscv-6.8

Linux-Starfive-5.19

Linux-Starfive-6.2

Linux-Starfive-6.5

Linux-Xilinx

Linux Kernel

References · 15

• https://git.kernel.org/stable/c/4d480efd98e290c445f4ba476e4dcda5624b1aab · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43252 · Security Note
• https://ubuntu.com/security/CVE-2026-43252 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43252 · Vendor Advisory
• https://git.kernel.org/stable/c/1b3ff4d88b508b73e2bbddb59356311efb7ba192 · Patch
• https://git.kernel.org/stable/c/d191101dee25567c2af3b28565f45346c33d65f5 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43252 · Vendor Advisory
• https://git.kernel.org/stable/c/7e4d88e36e5d0b8ffda637999cbca64c81701a81 · Patch
• https://cve.org/CVERecord?id=CVE-2026-43252 · Security Note
• https://git.kernel.org/stable/c/d90d73ad183566c81320d453a223f610a280f210 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43252 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43252 · Vendor Advisory
• https://git.kernel.org/stable/c/7c1d221e475e3d8eb8ed4702392d43f8c5134d1f · Patch
• https://git.kernel.org/linus/d191101dee25567c2af3b28565f45346c33d65f5 · Note
• https://docs.bell-sw.com/security/cves/CVE-2026-43252 · Note