SB2026092890 - Improper Check or Handling of Exceptional Conditions in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-98104)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/6890e28840bae4f6805e8de981c4ec8e12a4e064
• https://git.kernel.org/stable/c/d7e7e98d23f42a92d9ab7e36302bd96bd9b33b5f
• https://git.kernel.org/stable/c/f594f04268d01c5fdc975f3f51fc219ea2159ac6
• https://git.kernel.org/stable/c/feab9261b537df4ebb8350e4779bc185373059fd