CVE-2025-37787
Description
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/[email protected]/ 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.
How to fix
- linux linux_kernel5.15.181, 6.1.135, 6.6.88, 6.12.25, 6.14.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.13 ≤ v < 5.15.181, 5.16 ≤ v < 6.1.135, 6.2 ≤ v < 6.6.88, 6.7 ≤ v < 6.12.25, 6.13 ≤ v < 6.14.4, 6.15 | 5.15.181, 6.1.135, 6.6.88, 6.12.25, 6.14.4 |
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