CVE-2026-98008
Description
In the Linux kernel, the following vulnerability has been resolved: net: macb: fix NULL pointer dereference on unbind with fixed-link When the device tree describes a fixed-link and has no "mdio" child node, macb_mii_init() returns early without allocating the MDIO bus, leaving bp->mii_bus as NULL. Two cleanup paths then dereference this NULL bus: 1. On driver unbind, macb_remove() unconditionally calls mdiobus_unregister(bp->mii_bus), which oopses: Unable to handle kernel NULL pointer dereference at virtual address 00000000000004a8 pc : mdiobus_unregister+0x14/0xa4 lr : macb_remove+0x38/0xa4 Call trace: mdiobus_unregister+0x14/0xa4 (P) macb_remove+0x38/0xa4 platform_remove+0x20/0x30 device_release_driver_internal+0x1c8/0x224 unbind_store+0xb4/0xbc 2. On the probe error path in macb_probe(), reached when macb_mii_init() has succeeded but a subsequent step fails, the err_out_unregister_mdio label runs the same unconditional cleanup. mdiobus_unregister() and mdiobus_free() do not guard against a NULL bus, so guard the calls in both macb_remove() and the probe error path.
How to fix
- Linux Linuxafa224cabc0132ca414b9141b1a919ca2d318cd0, 054ad8e66025eb4778d840bef80c270646cebcd2, f737d999fcb8f276d77b01ea4c2016ee01dad19b, 5710f6a74f63cbba0e15cd75917234916181c9d4, edb39c7666bb3924da761dfb417db85c1e5d8ad3, 38b6be101006d3e7af972999f45d4f1e8250587a, 6.1.189, 6.6.158, 5.11, 5.16, 6.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 831e19e565b5210930fa183730071f8290c61263 ≤ v < afa224cabc0132ca414b9141b1a919ca2d318cd0, 81db1e52848694761a1aa162ce76198af9964ed8 ≤ v < 054ad8e66025eb4778d840bef80c270646cebcd2, d0c3601f2c4e12e7689b0f46ebc17525250ea8c3 ≤ v < f737d999fcb8f276d77b01ea4c2016ee01dad19b, d0c3601f2c4e12e7689b0f46ebc17525250ea8c3 ≤ v < 5710f6a74f63cbba0e15cd75917234916181c9d4, d0c3601f2c4e12e7689b0f46ebc17525250ea8c3 ≤ v < edb39c7666bb3924da761dfb417db85c1e5d8ad3, d0c3601f2c4e12e7689b0f46ebc17525250ea8c3 ≤ v < 38b6be101006d3e7af972999f45d4f1e8250587a, cafa5942bd2df3d80e3eeb2deb4bc050f7761f3d, c81dcaa9cd0b66816c2ecb6c5df0b6afde9c7da5, 19088c5378c9fea54e552d8bc7418a3aa1e06990, 6.1.114 ≤ v < 6.1.189, 6.6.58 ≤ v < 6.6.158, 5.10.228 ≤ v < 5.11, 5.15.169 ≤ v < 5.16, 6.11.5 ≤ v < 6.12, 6.12 | afa224cabc0132ca414b9141b1a919ca2d318cd0, 054ad8e66025eb4778d840bef80c270646cebcd2, f737d999fcb8f276d77b01ea4c2016ee01dad19b, 5710f6a74f63cbba0e15cd75917234916181c9d4, edb39c7666bb3924da761dfb417db85c1e5d8ad3, 38b6be101006d3e7af972999f45d4f1e8250587a, 6.1.189, 6.6.158, 5.11, 5.16, 6.12 |
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.