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linux-hwe-edge

linux-aws-5.0

linux-aws-5.3

linux-azure

linux-azure-5.3

linux-azure-edge

linux-gcp

linux-gcp-5.3

linux-gke-4.15

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A use-after-free vulnerability was discovered and fixed in the Linux kernel's ksmbd component, specifically in the __ksmbd_close_fd() function related to durable file handle management. The issue arises when a durable file handle survives a session disconnect without proper cleanup of byte-range locks, leading to a use-after-free condition when the durable scavenger thread attempts to clean up. This vulnerability has a high severity with a CVSS score of 9.8 and affects multiple Linux kernel versions prior to 6.17.0-1026.26 and related builds. A patch is available and included in updated Linux kernel packages. Users should update and reboot to apply the fix and recompile any third-party kernel modules due to ABI changes.

The vulnerability (CVE-2026-31718) in the Linux kernel's ksmbd subsystem involves a use-after-free error in the __ksmbd_close_fd() function triggered via the durable scavenger mechanism. When a durable file handle remains after a session disconnect (TCP close without SMB2_LOGOFF), the connection pointer (fp->conn) is set to NULL to preserve the handle for reconnection, but the associated byte-range locks on fp->lock_list are not cleaned up. Subsequently, the durable scavenger thread calls __ksmbd_close_fd(NULL, fp), which attempts to acquire a spinlock on fp->conn->llist_lock, causing a use-after-free since fp->conn is NULL and the original connection object has been freed. The root cause is asymmetric cleanup of lock entries. The fix involves safely skipping clist deletion when the list is empty and fp->conn is NULL, among other lifetime management improvements. The vulnerability affects numerous Linux kernel versions before 6.17.0-1026.26 and specific other builds. The vendor advisory confirms a patch is available, and users must update and reboot to apply it.

Detailed information about UBUNTU-CVE-2026-31718 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-31718 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger When a… (CVE-2026-31718)

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