SB20261007125 - Missing Release of Resource after Effective Lifetime in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-98235)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to leak traffic control action references and leave actions registered after successful deletion requests.

The vulnerability exists due to incomplete resource release in tcf_action_put_many() in net/sched/act_api.c when processing a failed batched RTM_DELACTION request. A local user can submit a batch whose deletion fails at an action bound to a filter to leak traffic control action references and leave actions registered after successful deletion requests.

The leaked references belong to subsequent, unprocessed actions in the batch. A later deletion of an unbound action can report success without removing that action from the IDR.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1be63e4579af408d596f0f3165faf1a880631d3b
• https://git.kernel.org/stable/c/57b477e46ef2df3483f3488cc713c61c4b384aab
• https://git.kernel.org/stable/c/6e05e46fa821a5c1b281355f1f622ac76cb6080a
• https://git.kernel.org/stable/c/9eaba16f1b6ee19b249e6afd82c27f958d441458