What’s Vulnerable › Vulnerabilities

CVE-2023-32248: Tree connection null pointer dereference denial-of-service vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-24 · updated 2026-06-17
• Weakness: CWE-476

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_TREE_CONNECT and SMB2_QUERY_INFO commands. The issue results from the lack of proper validation of a pointer prior to accessing it. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Affected products

• Linux kernel: from 5.15 before 5.15.111; from 5.16 before 6.1.28; from 6.2 before 6.2.15; from 6.3 before 6.3.2 — fixed in 5.15.111, 6.1.28, 6.2.15, 6.3.2
• NetApp H300S: all versions
• NetApp H410C: all versions
• NetApp H410S: all versions
• NetApp H500S: all versions
• NetApp H700S: all versions

How to fix

Upgrade to a fixed version: Linux kernel 5.15.111, 6.1.28, 6.2.15, 6.3.2. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2023-32248
• https://bugzilla.redhat.com/show_bug.cgi?id=2219818
• https://security.netapp.com/advisory/ntap-20230915-0006/
• https://www.zerodayinitiative.com/advisories/ZDI-CAN-20479/
• https://access.redhat.com/security/cve/CVE-2023-32248
• https://bugzilla.redhat.com/show_bug.cgi?id=2219818
• https://security.netapp.com/advisory/ntap-20230915-0006/
• https://www.zerodayinitiative.com/advisories/ZDI-CAN-20479/

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