| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-23131: dlm: prevent NPD when writing a positive value to event_done |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2025-23131 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.31 with commit 8511a2728ab82cab398e39d019f5cf1246021c1c and fixed in 6.14.2 with commit b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c |
| Issue introduced in 2.6.31 with commit 8511a2728ab82cab398e39d019f5cf1246021c1c and fixed in 6.15 with commit 8e2bad543eca5c25cd02cbc63d72557934d45f13 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-23131 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| fs/dlm/lockspace.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c |
| https://git.kernel.org/stable/c/8e2bad543eca5c25cd02cbc63d72557934d45f13 |
