CVE-2025-23131
In the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to event_done do_uevent returns the value written to event_done.
Does this matter?
Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to event_done do_uevent returns the value written to event_done. In case it is a positive value, new_lockspace would undo all the work, and lockspace would not be set. __dlm_new_lockspace, however, would treat that positive value as a success due to commit 8511a2728ab8 ("dlm: fix use count with multiple joins"). Down the line, device_create_lockspace would pass that NULL lockspace to dlm_find_lockspace_local, leading to a NULL pointer dereference. Treating such positive values as successes prevents the problem. Given this has been broken for so long, this is unlikely to break userspace expectations.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.19% probability · 9th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/10b7a59814765d18d43555c9cef4eb3048b7e8a3
- https://git.kernel.org/stable/c/7109d69bec6edce546dc870e66bd2b668a3d5549
- https://git.kernel.org/stable/c/8e2bad543eca5c25cd02cbc63d72557934d45f13Patch
- https://git.kernel.org/stable/c/a1c41aebb184d9228a440dcb6761224e65b0e49a
- https://git.kernel.org/stable/c/b73c4ad4d387fe5bc988145bd9f1bc0de76afd5cPatch
- https://git.kernel.org/stable/c/c7837e2c96559663c33f43da403d9cf3cf77cfa7
- https://git.kernel.org/stable/c/ee28d99d789b077565cbe0377374d1e826c64d93
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.