PT-2026-37543 · Linux+3 · Linux+156

Published 2026-05-06 · Updated 2026-05-09 · CVE-2026-43203

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

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

Description A use-after-free issue exists in the Linux kernel during the removal of PCA-200E or SBA-200E adapters. When an adapter is detached, the fore200e structure is deallocated; however, if tx tasklet or rx tasklet are still running or pending, they may attempt to access the freed fore200e memory within the fore200e tx tasklet() or fore200e rx tasklet() functions. This race condition occurs when fore200e shutdown() frees the memory while fore200e interrupt() has already scheduled a tasklet.

Recommendations Implement a fix by adding the tasklet kill() function within fore200e shutdown() to synchronize and cancel pending or running tasklets. This call should be placed after fore200e reset() and specifically within the FORE200E STATE IRQ branch of the switch...case structure to ensure tasklets are only killed when they have been initialized.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-43203

Affected Products

Linux

Linux-Allwinner-5.19

Linux-Aws

Linux-Aws-5.0

Linux-Aws-5.11

Linux-Aws-5.13

Linux-Aws-5.15

Linux-Aws-5.19

Linux-Aws-5.3

Linux-Aws-5.4

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-Aws-Hwe

Linux-Azure

Linux-Azure-4.15

Linux-Azure-5.11

Linux-Azure-5.13

Linux-Azure-5.15

Linux-Azure-5.19

Linux-Azure-5.3

Linux-Azure-5.4

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-5.15

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-Bluefield

Linux-Fips

Linux-Gcp

Linux-Gcp-4.15

Linux-Gcp-5.11

Linux-Gcp-5.13

Linux-Gcp-5.15

Linux-Gcp-5.19

Linux-Gcp-5.3

Linux-Gcp-5.4

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-5.15

Linux-Hwe-5.19

Linux-Hwe-5.4

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-5.15

Linux-Ibm-5.4

Linux-Ibm-6.8

Linux-Intel-5.13

Linux-Intel-Iot-Realtime

Linux-Intel-Iotg

Linux-Intel-Iotg-5.15

Linux-Iot

Linux-Kvm

Linux-Lowlatency

Linux-Lowlatency-Hwe-5.15

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-Lts-Xenial

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-Nvidia-Tegra-5.15

Linux-Nvidia-Tegra-Igx

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-5.15

Linux-Oracle-5.3

Linux-Oracle-5.4

Linux-Oracle-5.8

Linux-Oracle-6.14

Linux-Oracle-6.17

Linux-Oracle-6.5

Linux-Oracle-6.8

Linux-Raspi

Linux-Raspi-5.4

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-5.15

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-Xilinx-Zynqmp

Linux Kernel

References · 17

• https://git.kernel.org/stable/c/91f25749aaf57c47ae1e12478144e6ea8c8562f2 · Patch
• https://git.kernel.org/stable/c/e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d · Patch
• https://git.kernel.org/stable/c/e075ec9b08f862dade8011481058f7eb5f716c57 · Patch
• https://git.kernel.org/stable/c/97900f512252a59f23d6ce4ab215cc88fed66e68 · Patch
• https://git.kernel.org/stable/c/73fbc5d1a9ccb626937500bbd67136f077d8237b · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43203 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43203 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43203 · Security Note
• https://git.kernel.org/stable/c/aba0b4bc09376dfc3d53c826514fe38fc8337f52 · Patch
• https://cve.org/CVERecord?id=CVE-2026-43203 · Security Note
• https://ubuntu.com/security/CVE-2026-43203 · Vendor Advisory
• https://git.kernel.org/stable/c/8930878101cd40063888a68af73b1b0f8b6c79bc · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43203 · Vendor Advisory
• https://git.kernel.org/stable/c/5189368f10903956be05062d160b2804bf5e5016 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43203 · Vendor Advisory