dlm: prevent NPD when writing a positive value to event_done

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CVE-2025-23131

In the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to eventdone douevent returns the value written to eventdone. In case it is a positive value, newlockspace would undo all the work, and lockspace would not be set. dlmnewlockspace,...

AZL-69653 CVE-2025-23131 affecting package kernel 5.15.200.1-1

In the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to eventdone douevent returns the value written to eventdone. In case it is a positive value, newlockspace would undo all the work, and lockspace would not be set. dlmnewlockspace,...

CVE-2025-23131

CVE-2025-23131 affects the Linux kernel in the DLM subsystem. The issue occurs when do_uevent returns a positive value written to event_done; this value previously caused new_lockspace to consider it a success, leaving lockspace uninitialized and leading to a NULL pointer dereference in dlm_find_...