Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-98104
Published: September 28, 2026
Vulnerability identifier: #VU152353
CSH Severity: Low
CVSS v4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98104
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause duplicate u32 filter handles.
The vulnerability exists due to improper handling of identifier-pool exhaustion in gen_new_kid and u32_change when generating automatic u32 node handles after the node ID pool is exhausted. A local privileged user can add enough u32 filters with automatically generated handles to exhaust the node ID space and cause duplicate handles.
The affected classifier must be enabled and a clsact qdisc must be configured on a device.
Affected software
Linux kernel
How to mitigate CVE-2026-98104
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3