CVE-2026-53270 ipvs: clear the svc scheduler ptr early on edit
A use-after-free in the Linux kernel IPVS scheduler allows attackers to cause denial of service or potentially execute code via crafted network traffic.
- 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-2026-53270?
CVE-2026-53270 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jun 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:
ipvs: clear the svc scheduler ptr early on edit
ip_vs_edit_service() while unbinding the old scheduler clears the svc->scheduler ptr after the scheduler module initiates RCU callbacks. This can cause packets to use the old scheduler at the time when svc->sched_data is already freed after RCU grace period.
Fix it by clearing the ptr early in ip_vs_unbind_scheduler(), before the done_service method schedules any RCU callbacks.
Also, if the new scheduler fails to initialize when replacing the old scheduler, try to restore the old scheduler while still returning the error code.
Weakness: CWE-416
Which versions are affected by CVE-2026-53270?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53270?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-53270 being exploited?
There is no known exploitation of CVE-2026-53270 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90554, BELL-CVE-2026-53270, DEBIAN-CVE-2026-53270, GHSA-r42m-j2mw-2qf9, ROOT-OS-DEBIAN-11-CVE-2026-53270, ROOT-OS-DEBIAN-12-CVE-2026-53270 and 3 more.