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CVE-2025-38146

9.4 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: Fix the dead loop of MPLS parse The unexpected MPLS packet may not end with the bottom label stack.

Published Jul 3, 2025CWE-129EPSS 0.48%

Overview

CVE-2025-38146 is a critical-severity vulnerability. It was published on July 3, 2025 and has a CVSS 3.1 base score of 9.4 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.4, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: openvswitch: Fix the dead loop of MPLS parse

The unexpected MPLS packet may not end with the bottom label stack.

When there are many stacks, The label count value has wrapped around.

A dead loop occurs, soft lockup/CPU stuck finally.

stack backtrace:

UBSAN: array-index-out-of-bounds in /build/linux-0Pa0xK/linux-5.15.0/net/openvswitch/flow.c:662:26

index -1 is out of range for type '__be32 [3]'

CPU: 34 PID: 0 Comm: swapper/34 Kdump: loaded Tainted: G OE 5.15.0-121-generic #131-Ubuntu

Hardware name: Dell Inc. PowerEdge C6420/0JP9TF, BIOS 2.12.2 07/14/2021

Call Trace:

<IRQ>

show_stack+0x52/0x5c

dump_stack_lvl+0x4a/0x63

dump_stack+0x10/0x16

ubsan_epilogue+0x9/0x36

__ubsan_handle_out_of_bounds.cold+0x44/0x49

key_extract_l3l4+0x82a/0x840 [openvswitch]

? kfree_skbmem+0x52/0xa0

key_extract+0x9c/0x2b0 [openvswitch]

ovs_flow_key_extract+0x124/0x350 [openvswitch]

ovs_vport_receive+0x61/0xd0 [openvsw

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0bdc924bfb319fb10d1113cbf091fc26fb7b1f99Refgit.kernel.org/stable/c/3c1906a3d50cb94fd0a10e97a1c0a40c0f033cb7Refgit.kernel.org/stable/c/4b9a086eedc1fddae632310386098c12155e3d0aRefgit.kernel.org/stable/c/69541e58323ec3e3904e1fa87a6213961b1f52f4Refgit.kernel.org/stable/c/8ebcd311b4866ab911d1445ead08690e67f0c488Refgit.kernel.org/stable/c/ad17eb86d042d72a59fd184ad1adf34f5eb36843Refgit.kernel.org/stable/c/f26fe7c3002516dd3c288f1012786df31f4d89e0Reflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38146?

CVE-2025-38146 is a critical-severity vulnerability. It was published on July 3, 2025 and has a CVSS 3.1 base score of 9.4 (CRITICAL).

How severe is CVE-2025-38146?

This vulnerability has a CVSS 3.1 base score of 9.4, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-38146?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38146?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38146 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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