CVE-2025-21848: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: nfp: bpf: Add check for nfp_app_ctrl_msg_alloc() Add check for the return value of nfp_app_ctrl_msg_alloc() in nfp_bpf_cmsg_alloc() to prevent null pointer dereference.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.16 — 6.1.130
linux	linux_kernel	6.2 — 6.6.80
linux	linux_kernel	6.7 — 6.12.17
linux	linux_kernel	6.13 — 6.13.5
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/1358d8e07afdf21d49ca6f00c56048442977e00a https://git.kernel.org/stable/c/29ccb1e4040da6ff02b7e64efaa2f8e6bf06020d https://git.kernel.org/stable/c/878e7b11736e062514e58f3b445ff343e6705537 https://git.kernel.org/stable/c/897c32cd763fd11d0b6ed024c52f44d2475bb820 https://git.kernel.org/stable/c/924b239f9704566e0d86abd894d2d64bd73c11eb https://git.kernel.org/stable/c/bd97f60750bb581f07051f98e31dfda59d3a783b https://git.kernel.org/stable/c/d64c6ca420019712e194fe095b55f87363e22a9a https://git.kernel.org/stable/c/e976ea6c5e1b005c64467cbf94a8577aae9c7d81

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html https://cert-portal.siemens.com/productcert/html/ssa-082556.html

Frequently Asked Questions

What is CVE-2025-21848? +

In the Linux kernel, the following vulnerability has been resolved: nfp: bpf: Add check for nfp_app_ctrl_msg_alloc() Add check for the return value of nfp_app_ctrl_msg_alloc() in nfp_bpf_cmsg_alloc() to prevent null pointer dereference. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21848? +

CVE-2025-21848 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-21848? +

CVE-2025-21848 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21848? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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