Bug 2448593 (CVE-2026-23245)

Summary: CVE-2026-23245 kernel: net/sched: act_gate: snapshot parameters with RCU on replace
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2026-03-18 11:02:20 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/sched: act_gate: snapshot parameters with RCU on replace

The gate action can be replaced while the hrtimer callback or dump path is
walking the schedule list.

Convert the parameters to an RCU-protected snapshot and swap updates under
tcf_lock, freeing the previous snapshot via call_rcu(). When REPLACE omits
the entry list, preserve the existing schedule so the effective state is
unchanged.
Comment 1 Keith Grant 2026-03-18 12:36:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026031817-CVE-2026-23245-ac26@gregkh/T