CVE-2025-23131

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> dlm: prevent NPD when writing a positive value to event_done<br /> <br /> do_uevent returns the value written to event_done. In case it is a<br /> positive value, new_lockspace would undo all the work, and lockspace<br /> would not be set. __dlm_new_lockspace, however, would treat that<br /> positive value as a success due to commit 8511a2728ab8 ("dlm: fix use<br /> count with multiple joins").<br /> <br /> Down the line, device_create_lockspace would pass that NULL lockspace to<br /> dlm_find_lockspace_local, leading to a NULL pointer dereference.<br /> <br /> Treating such positive values as successes prevents the problem. Given<br /> this has been broken for so long, this is unlikely to break userspace<br /> expectations.