CVE-2023-32247 Session setup memory exhaustion denial-of-service vulnerability

What is CVE-2023-32247?

CVE-2023-32247 is a high-severity denial of service 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 handling of SMB2_SESSION_SETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Weakness: CWE-401

Which versions are affected by CVE-2023-32247?

It affects 5 products.

Products include Linux kernel, Netapp H300s, Netapp H410s, Netapp H500s, Netapp H700s.

How do I fix CVE-2023-32247?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-32247 being exploited?

There is no known exploitation of CVE-2023-32247 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-27643, AZL-27765, DEBIAN-CVE-2023-32247, GHSA-ph9g-g7m5-2pg5, UBUNTU-CVE-2023-32247.