PT-2026-32348 · Linux · Linux Kernel

Published 2026-04-13 · Updated 2026-05-20 · CVE-2026-31422

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 NULL pointer dereference occurs in the flow change() function when a flow filter without a fully qualified baseclass is created on a shared block. This happens because flow change() calls tcf block q() and attempts to dereference q->handle to derive a default baseclass, but shared blocks leave block->q as NULL.

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

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-31422

ECHO-EB66-E4B1-68CA

Affected Products

Linux Kernel

References · 21

• https://cve.org/CVERecord?id=CVE-2026-31422 · Security Note
• https://git.kernel.org/stable/c/9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31422 · Vendor Advisory
• https://git.kernel.org/stable/c/cc707a4fd4c3b6ab2722e06bc359aa010e13d408 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-31422 · Security Note
• https://git.kernel.org/stable/c/415ea0c973c754b9f375225807810eb9045f4293 · Patch
• https://git.kernel.org/stable/c/a208c3e1232997e9317887294c20008dfcb75449 · Patch
• https://ubuntu.com/security/CVE-2026-31422 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31422 · Vendor Advisory
• https://git.kernel.org/stable/c/1a280dd4bd1d616a01d6ffe0de284c907b555504 · Patch
• https://git.kernel.org/stable/c/57f94ac7e953eece5ed4819605a18f3cdfc63dcc · Patch
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-31422 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2026-31422 · Vendor Advisory
• https://git.kernel.org/stable/c/4a09f72007201c9f667dc47f64517ec23eea65e5 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-31422 · Vendor Advisory