CVE-2026-31706
Description
A flaw was found in ksmbd, a Linux kernel module that provides an in-kernel SMB server. An authenticated client can exploit this vulnerability by manipulating the num_aces value within the parent directory's security.NTACL extended attribute. This manipulation causes ksmbd to attempt an excessively large heap allocation, which can lead to a Denial of Service (DoS) by exhausting available memory resources.
Understanding the Weakness (CWE)
Other,Integrity,Availability
Technical Impact: Varies by Context; DoS: Resource Consumption (CPU); Modify Memory; Read Memory
When the quantity is not properly validated, then attackers can specify malicious quantities to cause excessive resource allocation, trigger unexpected failures, enable buffer overflows, etc.
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