CVE-2026-23245: net/sched: act_gate: snapshot parameters with RCU on replace

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-18 · updated 2026-10-15

Description

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.

Affected products

Linux kernel: from 5.8.1 before 5.10.253; from 5.11 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.18; from 6.19 before 6.19.8 — fixed in 5.10.253, 6.1.167, 6.12.78, 6.18.18, 6.19.8, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 5.10.253, 6.1.167, 6.12.78, 6.18.18. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-23245 or the next vulnerability affects your stack