CVE-2025-37787

Summary

In the Linux kernel, the following vulnerability has been resolved:

net: dsa: mv88e6xxx: avoid unregistering devlink regions which were never registered

Russell King reports that a system with mv88e6xxx dereferences a NULL pointer when unbinding this driver: https://lore.kernel.org/netdev/Z_lRkMlTJ1KQ0kVX@shell.armlinux.org.uk/

The crash seems to be in devlink_region_destroy(), which is not NULL tolerant but is given a NULL devlink global region pointer.

At least on some chips, some devlink regions are conditionally registered since the blamed commit, see mv88e6xxx_setup_devlink_regions_global():

	if (cond && !cond(chip))
		continue;

These are MV88E6XXX_REGION_STU and MV88E6XXX_REGION_PVT. If the chip does not have an STU or PVT, it should crash like this.

To fix the issue, avoid unregistering those regions which are NULL, i.e. were skipped at mv88e6xxx_setup_devlink_regions_global() time.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux836021a2d0e0e4c90b895a35bd9c0342071855fb < 8ccdf5e24b276848eefb2755e05ff0f005a0c4a1affected
LinuxLinux836021a2d0e0e4c90b895a35bd9c0342071855fb < b3c70dfe51f10df60db2646c08cebd24bcdc5247affected
LinuxLinux836021a2d0e0e4c90b895a35bd9c0342071855fb < bbb80f004f7a90c3dcaacc982c59967457254a05affected
LinuxLinux836021a2d0e0e4c90b895a35bd9c0342071855fb < 3665695e3572239dc233216f06b41f40cc771889affected
LinuxLinux836021a2d0e0e4c90b895a35bd9c0342071855fb < 5f5e95945bb1e08be7655da6acba648274db457daffected
LinuxLinux836021a2d0e0e4c90b895a35bd9c0342071855fb < c84f6ce918a9e6f4996597cbc62536bbf2247c96affected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux5.15.181 <= 5.15.*unaffected
LinuxLinux6.1.135 <= 6.1.*unaffected
LinuxLinux6.6.88 <= 6.6.*unaffected
LinuxLinux6.12.25 <= 6.12.*unaffected
LinuxLinux6.14.4 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References