TLB Race Condition Fix in Linux Kernel

Publication date: 2026-06-24

Last updated on: 2026-07-10

Assigner: kernel.org

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.

CVSS Scores

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Meta Information

Published

2026-06-24

Last Modified

2026-07-10

Generated

2026-07-15

AI Q&A

2026-06-24

EPSS Evaluated

2026-07-14

NVD

CVE-2026-53020

EUVD

EUVD-2026-38888

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is a potential race condition in the Linux kernel's TLB (Translation Lookaside Buffer) synchronization process. During TLB sync, the kernel needs to traverse and modify the page table, which requires holding the page table lock. However, because full SMP (Symmetric Multiprocessing) support for threads within the same process is still missing, the split page table lock is disabled to simplify the process. The race condition could occur if the page table lock is not properly held during this operation.

Impact Analysis

The vulnerability could lead to inconsistent or incorrect page table modifications during TLB synchronization, potentially causing system instability or unexpected behavior in the Linux kernel. This might affect system performance or reliability, especially in multi-threaded environments where proper locking is critical.

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