Linux Kernel up to 7.0.9 um race condition

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.0.9. It has been rated as critical. This impacts an unknown function of the component um. The manipulation leads to race condition. This vulnerability is referenced as CVE-2026-53020. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.0.9 and classified as critical. This issue affects an unknown function of the component um. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. The impact remains unknown. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-53020 since 06/09/2026. The exploitation is known to be difficult. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 7.0.10 eliminates this vulnerability. Applying the patch f21c343ec7419377bff89ab11146c03ae117036f/102331b66bcaf1f41f50b9c4cd5c36e46bafa9f3 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 7.0.10
Patch: f21c343ec7419377bff89ab11146c03ae117036f/102331b66bcaf1f41f50b9c4cd5c36e46bafa9f3

Timelineinfo

06/09/2026 CVE reserved
06/24/2026 +15 days Advisory disclosed
06/24/2026 +0 days VulDB entry created
06/24/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-53020 (🔒)
GCVE (CVE): GCVE-0-2026-53020
GCVE (VulDB): GCVE-100-373415

Entryinfo

Created: 06/24/2026 21:09
Changes: 06/24/2026 21:09 (58)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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