CVE-2023-3867 ksmbd: fix out of bounds read in smb2_sess_setup

What is CVE-2023-3867?

CVE-2023-3867 is a critical memory corruption vulnerability in Linux kernel, published on 16 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix out of bounds read in smb2_sess_setup

ksmbd does not consider the case of that smb2 session setup is in compound request. If this is the second payload of the compound, OOB read issue occurs while processing the first payload in the smb2_sess_setup().

Weakness: CWE-125

Which versions are affected by CVE-2023-3867?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-3867?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-3867 being exploited?

There is no known exploitation of CVE-2023-3867 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-2023-3867, DEBIAN-CVE-2023-3867, GHSA-pm54-8x3h-h6h9, UBUNTU-CVE-2023-3867.