SMB2 Lease Handling Issue in Linux Kernel Impacting Server Functionality

CVE-2026-98901

What is CVE-2026-98901?

A vulnerability exists in the Linux kernel related to improper handling of lease breaks in the ksmbd, which affects the management of lease states for SMB2. This issue can disrupt the acknowledgment of lease breaks and improper handling during write operations, potentially leading to inconsistencies and loss of server functionality. The fix ensures that valid lease states are not skipped, and that break acknowledgments align with SMB2 requirements, enhancing the stability and security of file-sharing services.

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