The vulnerability of the fw_classify() function in the net/sched/cls_fw.c module of the network scheduling subsystem of the Linux operating system allows a hacker to cause a service failure.

The vulnerability of the fwclassify function in the net/sched/clsfw.c file of the network scheduling subsystem in the Linux operating system is related to pointer manipulation. Exploiting this vulnerability could allow an attacker to cause a service failure...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsfw: fix NULL pointer dereference on shared blocks The oldmethod path in fwclassify calls tcfblockq, and dereferences q-handle. Shared blocks leave block-q as NULL, causing a NULL dereference when an empty clsfw filt...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-100548)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-100548 advisory. In the Linux kernel, the following vulnerability has been resolved: net/sched: clsfw: fix NULL dereference of old filters before change Like pointed out by Sashiko 1...

AZL-90789 CVE-2026-53080 affecting package kernel for versions less than 6.6.143.1-1

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsfw: fix NULL dereference of "old" filters before change Like pointed out by Sashiko 1, since commit ed76f5edccc9 "net: sched: protect filterchain list with filterchainlock mutex" TC filters are added to a shared blo...

CVE-2026-53080: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsfw: fix NULL dereference of "old" filters before change Like pointed out by Sashiko 1, since commit ed76f5edccc9 "net: sched: protect filterchain list with filterchainlock mutex" TC filters are added to a shared blo...

CVE-2026-31421: NULL Pointer Dereference

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsfw: fix NULL pointer dereference on shared blocks The old-method path in fwclassify calls tcfblockq and dereferences q-handle. Shared blocks leave block-q NULL, causing a NULL deref when an empty clsfw filter is...