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CVE-2025-21868

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: allow small head cache usage with large MAX_SKB_FRAGS values Sabrina reported the following splat: WARNING: CPU: 0 PI…

Published Mar 27, 2025EPSS 0.39%

Overview

CVE-2025-21868 is a high-severity vulnerability. It was published on March 27, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. 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: allow small head cache usage with large MAX_SKB_FRAGS values

Sabrina reported the following splat:

WARNING: CPU: 0 PID: 1 at net/core/dev.c:6935 netif_napi_add_weight_locked+0x8f2/0xba0

Modules linked in:

CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.14.0-rc1-net-00092-g011b03359038 #996

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014

RIP: 0010:netif_napi_add_weight_locked+0x8f2/0xba0

Code: e8 c3 e6 6a fe 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc c7 44 24 10 ff ff ff ff e9 8f fb ff ff e8 9e e6 6a fe <0f> 0b e9 d3 fe ff ff e8 92 e6 6a fe 48 8b 04 24 be ff ff ff ff 48

RSP: 0000:ffffc9000001fc60 EFLAGS: 00010293

RAX: 0000000000000000 RBX: ffff88806ce48128 RCX: 1ffff11001664b9e

RDX: ffff888008f00040 RSI: ffffffff8317ca42 RDI: ffff88800b325cb6

RBP: ffff88800b325c40 R08: 0000000000000001 R09: ffffed100167502c

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/14ad6ed30a10afbe91b0749d6378285f4225d482Refgit.kernel.org/stable/c/648e440c98e260dec835e48a5d7a9993477b1f9dRefgit.kernel.org/stable/c/ed0ca7d2127c63991cfaf1932b827e3f4f8ee480Refgit.kernel.org/stable/c/ed8a77fee4618facd2a539cad7b7366697b5a575

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21868?

CVE-2025-21868 is a high-severity vulnerability. It was published on March 27, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-21868?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-21868?

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-2025-21868?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21868 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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