CVE-2026-23245 net/sched: act_gate: snapshot parameters with RCU on replace
A race condition in the Linux kernel's gate action allows concurrent access issues during replacement, potentially causing system instability or crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23245?
CVE-2026-23245 is a high-severity vulnerability in Linux kernel, published on 18 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-23245?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23245?
Apply the vendor's patch.
Is CVE-2026-23245 being exploited?
There is no known exploitation of CVE-2026-23245 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-79983, BELL-CVE-2026-23245, DEBIAN-CVE-2026-23245, GHSA-vw2r-ffc4-8xm3, ROOT-OS-DEBIAN-11-CVE-2026-23245, ROOT-OS-DEBIAN-12-CVE-2026-23245 and 4 more.