CVE-2025-38665
Description
In the Linux kernel, the following vulnerability has been resolved: can: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode Andrei Lalaev reported a NULL pointer deref when a CAN device is restarted from Bus Off and the driver does not implement the struct can_priv::do_set_mode callback. There are 2 code path that call struct can_priv::do_set_mode: - directly by a manual restart from the user space, via can_changelink() - delayed automatic restart after bus off (deactivated by default) To prevent the NULL pointer deference, refuse a manual restart or configure the automatic restart delay in can_changelink() and report the error via extack to user space. As an additional safety measure let can_restart() return an error if can_priv::do_set_mode is not set instead of dereferencing it unchecked.
How to fix
- linux linux_kernel6.1.148, 6.6.101, 6.12.41, 6.15.9 or later
- git.kernel.org/stable/c/0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5
- git.kernel.org/stable/c/6acceb46180f9e160d4f0c56fcaf39ba562822ae
- git.kernel.org/stable/c/6bbcf37c5114926c99a1d1e6993a5b35689d2599
- git.kernel.org/stable/c/c1f3f9797c1f44a762e6f5f72520b2e520537b52
- git.kernel.org/stable/c/cf81a60a973358dea163f6b14062f17831ceb894
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.31 ≤ v < 6.1.148, 6.2 ≤ v < 6.6.101, 6.7 ≤ v < 6.12.41, 6.13 ≤ v < 6.15.9, 6.16 | 6.1.148, 6.6.101, 6.12.41, 6.15.9 |
| debian debian_linux | 11.0 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.