CVE-2026-53020 um: Fix potential race condition in TLB sync
A race condition in the Linux kernel's TLB sync allows attackers to potentially escalate privileges or cause a denial of service.
- 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-2026-53020?
CVE-2026-53020 is a high-severity vulnerability in Linux kernel, published on 24 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:
um: Fix potential race condition in TLB sync
During the TLB sync, we need to traverse and modify the page table, so we should hold the page table lock. Since full SMP support for threads within the same process is still missing, let's disable the split page table lock for simplicity.
Weakness: CWE-362
Which versions are affected by CVE-2026-53020?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53020?
Apply the vendor's patch.
Is CVE-2026-53020 being exploited?
There is no known exploitation of CVE-2026-53020 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-53020, GHSA-m33q-f5vx-jwmj, UBUNTU-CVE-2026-53020.