CVE-2023-39179: Kernel: ksmbd: read request out-of-bounds read information disclosure vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% 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-125

Description

A flaw was found within the handling of SMB2 read requests in the kernel ksmbd module. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this to disclose sensitive information on affected installations of Linux. Only systems with ksmbd enabled are vulnerable to this CVE.

Affected products

Linux kernel: all versions

References

https://access.redhat.com/security/cve/CVE-2023-39179
https://bugzilla.redhat.com/show_bug.cgi?id=2326529
https://www.zerodayinitiative.com/advisories/ZDI-24-586/

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