Linux Kernel up to 6.17.7 udp_tunnel netdev_warn allocation of resources

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

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.17.7. The impacted element is the function netdev_warn of the component udp_tunnel. This manipulation causes allocation of resources. The identification of this vulnerability is CVE-2025-68191. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.17.7 and classified as critical. Affected by this vulnerability is the function netdev_warn of the component udp_tunnel. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: udp_tunnel: use netdev_warn() instead of netdev_WARN() netdev_WARN() uses WARN/WARN_ON to print a backtrace along with file and line information. In this case, udp_tunnel_nic_register() returning an error is just a failed operation, not a kernel bug. udp_tunnel_nic_register() can fail due to a memory allocation failure (kzalloc() or udp_tunnel_nic_alloc()). This is a normal runtime error and not a kernel bug. Replace netdev_WARN() with netdev_warn() accordingly.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2025-68191 since 12/16/2025. The exploitation appears to be difficult. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 282382 (Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2025-1350)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58 or 6.17.8 eliminates this vulnerability. Applying the patch 087f1ed450dc6e7e49ffbbbe5b78be1218c6d5e0/45e4e4a8772fa1c5f6f38e82b732b3a9d8137af4/7758ec35ff3e9a31558eda4f0f9eb0ddfa78a8ba/c018a87942bf1607aeebf8dba5a210ca9a09a0fd/51b3033088f0420b19027e3d54cd989b6ebd987e/3c3b148bf8384c8a787753cf20abde1c5731f97f/dc2f650f7e6857bf384069c1a56b2937a1ee370d 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 (282382) and CERT Bund (WID-SEC-2025-2868). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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

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

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

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
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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Nessus ID: 282382
Nessus Name: Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2025-1350)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.247/5.15.197/6.1.159/6.6.117/6.12.58/6.17.8
Patch: 087f1ed450dc6e7e49ffbbbe5b78be1218c6d5e0/45e4e4a8772fa1c5f6f38e82b732b3a9d8137af4/7758ec35ff3e9a31558eda4f0f9eb0ddfa78a8ba/c018a87942bf1607aeebf8dba5a210ca9a09a0fd/51b3033088f0420b19027e3d54cd989b6ebd987e/3c3b148bf8384c8a787753cf20abde1c5731f97f/dc2f650f7e6857bf384069c1a56b2937a1ee370d

Timelineinfo

12/16/2025 Advisory disclosed
12/16/2025 +0 days CVE reserved
12/16/2025 +0 days VulDB entry created
02/21/2026 +67 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-68191 (🔒)
GCVE (CVE): GCVE-0-2025-68191
GCVE (VulDB): GCVE-100-336739
CERT Bund: WID-SEC-2025-2868 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 12/16/2025 15:56
Updated: 02/21/2026 07:33
Changes: 12/16/2025 15:56 (59), 01/08/2026 23:34 (2), 01/19/2026 22:37 (7), 02/03/2026 03:56 (1), 02/21/2026 07:33 (1)
Complete: 🔍
Cache ID: 216::103

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