CVE-2025-39853: debian linux Out-of-bounds Read — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: i40e: Fix potential invalid access when MAC list is empty list_first_entry() never returns NULL - if the list is empty, it still returns a pointer to an invalid object, leading to potential invalid memory access when dereferenced. Fix this by using list_first_entry_or_null instead of list_first_entry.

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CVSS v3.1 Score

7.1

HIGH

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

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.6 — 5.4.299
linux	linux_kernel	5.5 — 5.10.243
linux	linux_kernel	5.11 — 5.15.192
linux	linux_kernel	5.16 — 6.1.151
linux	linux_kernel	6.2 — 6.6.105
linux	linux_kernel	6.7 — 6.12.46
linux	linux_kernel	6.13 — 6.16.6
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
debian	debian_linux	All

References

Advisories & Patches

https://git.kernel.org/stable/c/1eadabcf5623f1237a539b16586b4ed8ac8dffcd https://git.kernel.org/stable/c/3c6fb929afa313d9d11f780451d113f73922fe5d https://git.kernel.org/stable/c/66e7cdbda74ee823ec2bf7b830ebd235c54f5ddf https://git.kernel.org/stable/c/971feafe157afac443027acdc235badc6838560b https://git.kernel.org/stable/c/9c21fc4cebd44dd21016c61261a683af390343f8 https://git.kernel.org/stable/c/a556f06338e1d5a85af0e32ecb46e365547f92b9 https://git.kernel.org/stable/c/e2a5e74879f9b494bbd66fa93f355feacde450c7 https://git.kernel.org/stable/c/fb216d980fae6561c7c70af8ef826faf059c6515

Other References

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html https://cert-portal.siemens.com/productcert/html/ssa-032379.html https://cert-portal.siemens.com/productcert/html/ssa-089022.html

Frequently Asked Questions

What is CVE-2025-39853? +

In the Linux kernel, the following vulnerability has been resolved: i40e: Fix potential invalid access when MAC list is empty list_first_entry() never returns NULL - if the list is empty, it still returns a pointer to an invalid object, leading to potential invalid memory access when dereferenced. Fix this by using list_first_entry_or_null instead of list_first_entry. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-39853? +

CVE-2025-39853 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-39853? +

CVE-2025-39853 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-39853? +

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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CVE-2025-39853