CVE-2025-22038 ksmbd: validate zero num_subauth before sub_auth is accessed

What is CVE-2025-22038?

CVE-2025-22038 is a high-severity vulnerability in Linux kernel, published on 16 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-125

Which versions are affected by CVE-2025-22038?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-22038?

Apply the vendor's patch.

Is CVE-2025-22038 being exploited?

There is no known exploitation of CVE-2025-22038 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2025-22038, DEBIAN-CVE-2025-22038, GHSA-8xw7-j864-h87q, ROOT-OS-UBUNTU-2204-CVE-2025-22038, ROOT-OS-UBUNTU-2404-CVE-2025-22038, UBUNTU-CVE-2025-22038.