CVE-2025-38665

can: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode

State: Published
Severity: Not scored
Published: Aug 22, 2025
Updated: May 11, 2026
Reserved: Apr 16, 2025

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before 6bbcf37c5114926c99a1d1e6993a5b35689d2599Affected 39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before cf81a60a973358dea163f6b14062f17831ceb894Affected 39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before 0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5Affected 39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before 6acceb46180f9e160d4f0c56fcaf39ba562822aeAffected 39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before c1f3f9797c1f44a762e6f5f72520b2e520537b52Affected
LinuxLinux	2.6.31Affected before 2.6.31Not affected 6.1.148 through 6.1.Not affected 6.6.101 through 6.6.Not affected 6.12.41 through 6.12.Not affected 6.15.9 through 6.15.Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before 6bbcf37c5114926c99a1d1e6993a5b35689d2599Affected
39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before cf81a60a973358dea163f6b14062f17831ceb894Affected
39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before 0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5Affected
39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before 6acceb46180f9e160d4f0c56fcaf39ba562822aeAffected
39549eef3587f1c1e8c65c88a2400d10fd30ea17 to before c1f3f9797c1f44a762e6f5f72520b2e520537b52Affected

LinuxLinux

2.6.31Affected
before 2.6.31Not affected
6.1.148 through 6.1.*Not affected
6.6.101 through 6.6.*Not affected
6.12.41 through 6.12.*Not affected
6.15.9 through 6.15.*Not affected
6.16 and laterNot affected

References

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