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CVE-2025-21790

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: vxlan: check vxlan_vnigroup_init() return value vxlan_init() must check vxlan_vnigroup_init() success otherwise a crash happens…

Published Feb 27, 2025CWE-476EPSS 0.23%

Overview

CVE-2025-21790 is a medium-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

vxlan: check vxlan_vnigroup_init() return value

vxlan_init() must check vxlan_vnigroup_init() success

otherwise a crash happens later, spotted by syzbot.

Oops: general protection fault, probably for non-canonical address 0xdffffc000000002c: 0000 [#1] PREEMPT SMP KASAN NOPTI

KASAN: null-ptr-deref in range [0x0000000000000160-0x0000000000000167]

CPU: 0 UID: 0 PID: 7313 Comm: syz-executor147 Not tainted 6.14.0-rc1-syzkaller-00276-g69b54314c975 #0

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014

RIP: 0010:vxlan_vnigroup_uninit+0x89/0x500 drivers/net/vxlan/vxlan_vnifilter.c:912

Code: 00 48 8b 44 24 08 4c 8b b0 98 41 00 00 49 8d 86 60 01 00 00 48 89 c2 48 89 44 24 10 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 04 00 00 49 8b 86 60 01 00 00 48 ba 00 00 00

RSP: 0018:ffffc9000cc1eea8 EFLAGS: 00010202

RAX: dffffc0000000000 RBX: 0000000000000001 RCX: fffff

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/3215f5aafc49aaa993991633833854694e73b439Refgit.kernel.org/stable/c/5805402dcc56241987bca674a1b4da79a249bab7Refgit.kernel.org/stable/c/79aea5e55156c87dc570e43fcd8bba01b9d6ab3fRefgit.kernel.org/stable/c/a303649b99b64858d62ce7428125d8e71675d2b6Refgit.kernel.org/stable/c/e860f847787fbbf0d8dacd638c019c7c3d4a9bd3Reflists.debian.org/debian-lts-announce/2025/03/msg00028.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21790?

CVE-2025-21790 is a medium-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21790?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21790?

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-2025-21790?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21790 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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