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linux-hwe-edge

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A vulnerability in the Linux kernel's ksmbd component related to SMB2 byte-range locks was resolved. The issue involved improper tracking of the connection owning a byte-range lock, which could lead to concurrent access of freed memory structures due to multichannel SMB3 connections. This could result in memory corruption and potentially allow privilege escalation or system compromise. The vulnerability has a high severity score and affects multiple Linux kernel versions. An official patch is available to address this issue.

The Linux kernel's ksmbd subsystem mishandled tracking of connections owning byte-range locks in SMB2_LOCK operations. Each granted lock was added to both the file lock list and the connection's lock list. However, during final close and durable handle operations, the connection list entry was removed under a different spinlock than the one protecting the list it belonged to, especially under SMB3 multichannel where the connection handling the LOCK request can differ from the one that opened the file. This led to potential concurrent traversal accessing freed ksmbd_lock and file_lock structures. The fix involves recording the owning connection for each lock's list entry, holding a reference while linked, and using the correct connection and lock for unlock, rollback, close, and durable preserve operations. Durable reconnect assigns the new connection as the owner when re-publishing locks.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: ksmbd: track the connection owning a byte-range lock SMB2_LOCK ad

In the Linux kernel, the following vulnerability has been resolved: ksmbd: track the connection owning a byte-range lock SMB2_LOCK adds each granted… (CVE-2026-64390) - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: ksmbd: track the connection owning a byte-range lock SMB2_LOCK adds each granted… (CVE-2026-64390)

Threats Tagged 'ghsa-pgh2-g34p-4j6m'