CVE-2023-32257 Session race condition remote code execution vulnerability

What is CVE-2023-32257?

CVE-2023-32257 is a high-severity vulnerability in Linux kernel, published on 24 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_SESSION_SETUP and SMB2_LOGOFF commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

Weakness: CWE-667, CWE-362

Which versions are affected by CVE-2023-32257?

It affects 6 products.

Products include Linux kernel, Netapp H300s, Netapp H410s, Netapp H500s, Netapp H700s, Netapp Solidfire \& Hci Storage Node.

How do I fix CVE-2023-32257?

Apply the vendor's patch.

Is CVE-2023-32257 being exploited?

There is no known exploitation of CVE-2023-32257 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 AZL-27639, AZL-27762, DEBIAN-CVE-2023-32257, GHSA-2rq6-85wg-96g4, UBUNTU-CVE-2023-32257.