CVE-2025-22038: linux kernel Out-of-bounds Read — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate zero num_subauth before sub_auth is accessed Access psid->sub_auth[psid->num_subauth - 1] without checking if num_subauth is non-zero leads to an out-of-bounds read. This patch adds a validation step to ensure num_subauth != 0 before sub_auth is accessed.

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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	< 6.1.134
linux	linux_kernel	6.2 — 6.6.87
linux	linux_kernel	6.7 — 6.12.23
linux	linux_kernel	6.13 — 6.13.11
linux	linux_kernel	6.14 — 6.14.2

References

Advisories & Patches

https://git.kernel.org/stable/c/0e36a3e080d6d8bd7a34e089345d043da4ac8283 https://git.kernel.org/stable/c/3ac65de111c686c95316ade660f8ba7aea3cd3cc https://git.kernel.org/stable/c/56de7778a48560278c334077ace7b9ac4bfb2fd1 https://git.kernel.org/stable/c/68c6c3142bfcdb049839d40a9a59ebe8ea865002 https://git.kernel.org/stable/c/bf21e29d78cd2c2371023953d9c82dfef82ebb36 https://git.kernel.org/stable/c/c8bfe1954a0b89e7b29b3a3e7f4c5e0ebd295e20

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Frequently Asked Questions

What is CVE-2025-22038? +

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate zero num_subauth before sub_auth is accessed Access psid->sub_auth[psid->num_subauth - 1] without checking if num_subauth is non-zero leads to an out-of-bounds read. This patch adds a validation step to ensure num_subauth != 0 before sub_auth is accessed. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-22038? +

CVE-2025-22038 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-2025-22038? +

CVE-2025-22038 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-2025-22038? +

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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