CVE-2025-38665

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 6bbcf37c5114926c99a1d1e6993a5b35689d2599affected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < cf81a60a973358dea163f6b14062f17831ceb894affected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5affected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < 6acceb46180f9e160d4f0c56fcaf39ba562822aeaffected
LinuxLinux39549eef3587f1c1e8c65c88a2400d10fd30ea17 < c1f3f9797c1f44a762e6f5f72520b2e520537b52affected
LinuxLinux2.6.31affected
LinuxLinux0 < 2.6.31unaffected
LinuxLinux6.1.148 <= 6.1.*unaffected
LinuxLinux6.6.101 <= 6.6.*unaffected
LinuxLinux6.12.41 <= 6.12.*unaffected
LinuxLinux6.15.9 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References