CVE-2026-98948 mlxsw: spectrum_flower: Fix port range register leak in tmplt_create()
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-98948?
CVE-2026-98948 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mlxsw: spectrum_flower: Fix port range register leak in tmplt_create()
mlxsw_sp_flower_tmplt_create() parses a flow_cls_offload template into a stack-local struct mlxsw_sp_acl_rule_info purely to compute rulei.values.elusage. Parsing can acquire port range registers via mlxsw_sp_flower_parse_ports_range(), but since this rulei never goes through mlxsw_sp_acl_rulei_destroy(), those registers were never released, including through chain template deletion.
Factor out of mlxsw_sp_acl_rulei_destroy() the code to actually release the necessary resources and call from mlxsw_sp_flower_tmplt_create() to plug the leak.
The issue was found during a review of Wentao Liang's patch referenced below.
Which versions are affected by CVE-2026-98948?
How do I fix CVE-2026-98948?
Upgrade to a fixed version.
Is CVE-2026-98948 being exploited?
There is no known exploitation of CVE-2026-98948 in the wild and no public exploit code.
Sources
Also known as AZL-110753, BELL-CVE-2026-98948, DEBIAN-CVE-2026-98948, GHSA-q8hc-4jgv-gvh5, UBUNTU-CVE-2026-98948.