Linux Kernel up to 6.13.0 u_serial denial of service

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.13.0. This vulnerability affects unknown code of the component u_serial. Such manipulation leads to denial of service. This vulnerability is documented as CVE-2025-21698. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.13.0. It has been rated as critical. Affected by this issue is an unknown code block of the component u_serial. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: Revert "usb: gadget: u_serial: Disable ep before setting port to null to fix the crash caused by port being null" This reverts commit 13014969cbf07f18d62ceea40bd8ca8ec9d36cec. It is reported to cause crashes on Tegra systems, so revert it for now.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2025-21698 since 12/29/2024. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 231946 (Linux Distros Unpatched Vulnerability : CVE-2025-21698), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.290, 5.10.234, 5.15.178, 6.1.128, 6.6.75, 6.12.12, 6.13.1 or 6.14-rc1 eliminates this vulnerability. Applying the patch 76e7577bb89b327abdf72d4c0d486074a17f712a/99c866bea85efdebfb6953a8a305f21ef5ca4991/20ce02f2f73af331dec76d3b8b78b18f4699db05/33233b06ad15730d0463e8f152db2eca15c7f498/3d8f4dc8c78ffd77a4106614977c1e51531690f7/bb50dc2aa49dcb5cc81205d814c08337b5da28ac/f8b8883ad76d36ee890b18311096af7af7d7a921/086fd062bc3883ae1ce4166cff5355db315ad879 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.

The vulnerability is also documented in the databases at Tenable (231946) and CERT Bund (WID-SEC-2025-0362). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source Linux Kernel

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.4.289
• 5.10.233
• 5.15.177
• 6.0
• 6.1
• 6.1.127
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 6.6.11
• 6.6.12
• 6.6.13
• 6.6.14
• 6.6.15
• 6.6.16
• 6.6.17
• 6.6.18
• 6.6.19
• 6.6.20
• 6.6.21
• 6.6.22
• 6.6.23
• 6.6.24
• 6.6.25
• 6.6.26
• 6.6.27
• 6.6.28
• 6.6.29
• 6.6.30
• 6.6.31
• 6.6.32
• 6.6.33
• 6.6.34
• 6.6.35
• 6.6.36
• 6.6.37
• 6.6.38
• 6.6.39
• 6.6.40
• 6.6.41
• 6.6.42
• 6.6.43
• 6.6.44
• 6.6.45
• 6.6.46
• 6.6.47
• 6.6.48
• 6.6.49
• 6.6.50
• 6.6.51
• 6.6.52
• 6.6.53
• 6.6.54
• 6.6.55
• 6.6.56
• 6.6.57
• 6.6.58
• 6.6.59
• 6.6.60
• 6.6.61
• 6.6.62
• 6.6.63
• 6.6.64
• 6.6.65
• 6.6.66
• 6.6.67
• 6.6.68
• 6.6.69
• 6.6.70
• 6.6.71
• 6.6.72
• 6.6.73
• 6.6.74
• 6.7
• 6.8
• 6.9
• 6.10
• 6.11
• 6.12
• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3
• 6.12.4
• 6.12.5
• 6.12.6
• 6.12.7
• 6.12.8
• 6.12.9
• 6.12.10
• 6.12.11
• 6.13.0

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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