PT-2026-37394 · Linux+3 · Linux+92

Published 2026-05-06 · Updated 2026-05-20 · CVE-2026-43084

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description A slab-use-after-free issue exists in the netfilter nfnetlink queue component. The problem occurs because a global hash table is shared among all queues, which can lead to a system crash. Specifically, a nf queue entry structure is freed using kfree(), but a parallel CPU may still encounter that same nf queue entry while walking the list. This flaw was identified in the nfqnl recv verdict() function.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-43084

Affected Products

Linux

Linux-Allwinner-5.19

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-6.2

Linux-Aws-6.5

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-6.2

Linux-Azure-6.5

Linux-Azure-Edge

Linux-Azure-Fde

Linux-Azure-Fde-5.19

Linux-Azure-Fde-6.2

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-6.2

Linux-Gcp-6.5

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-6.2

Linux-Hwe-6.5

Linux-Hwe-Edge

Linux-Intel-5.13

Linux-Intel-Iot-Realtime

Linux-Lowlatency-Hwe-5.19

Linux-Lowlatency-Hwe-6.11

Linux-Lowlatency-Hwe-6.2

Linux-Lowlatency-Hwe-6.5

Linux-Lts

Linux-Nvidia

Linux-Nvidia-6.11

Linux-Nvidia-6.2

Linux-Nvidia-6.5

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-6.5

Linux-Oem-6.8

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-6.5

Linux-Raspi-Realtime

Linux-Raspi2

Linux-Realtime

Linux-Realtime-6.14

Linux-Riscv

Linux-Riscv-5.11

Linux-Riscv-5.19

Linux-Riscv-5.8

Linux-Riscv-6.14

Linux-Riscv-6.5

Linux-Starfive-5.19

Linux-Starfive-6.2

Linux-Starfive-6.5

Linux Kernel

References · 14

• https://git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046a · Patch
• https://ubuntu.com/security/CVE-2026-43084 · Vendor Advisory
• https://git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f · Patch
• https://git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9d · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43084 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43084 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43084 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43084 · Security Note
• https://git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43084 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-43084 · Vendor Advisory
• https://git.kernel.org/linus/936206e3f6ff411581e615e930263d6f8b78df9d · Note
• https://docs.bell-sw.com/security/cves/CVE-2026-43084 · Note
• https://t.me/cveNotify/164304 · Telegram Post