CVE-2023-39180: Kernel: ksmbd: read request memory leak denial-of-service vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-18 · updated 2026-06-17
Weakness: CWE-400

Description

A flaw was found within the handling of SMB2_READ commands in the kernel ksmbd module. The issue results from not releasing memory after its effective lifetime. An attacker can leverage this to create a denial-of-service condition on affected installations of Linux. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable.

Affected products

Linux kernel: all versions

References

https://access.redhat.com/security/cve/CVE-2023-39180
https://bugzilla.redhat.com/show_bug.cgi?id=2326531
https://www.zerodayinitiative.com/advisories/ZDI-24-589/

Get alerted when CVE-2023-39180 or the next vulnerability affects your stack