net: macb: fix NULL pointer dereference on unbind with fixed-link
Summary
| CVE | CVE-2026-98008 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-25 11:17:29 UTC |
| Updated | 2026-10-19 10:17:52 UTC |
| 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. |
Risk And Classification
EPSS: 0.001720000 probability, percentile 0.059940000 (date 2026-10-05)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 831e19e565b5210930fa183730071f8290c61263 afa224cabc0132ca414b9141b1a919ca2d318cd0 git | Not specified |
| CNA | Linux | Linux | affected 81db1e52848694761a1aa162ce76198af9964ed8 054ad8e66025eb4778d840bef80c270646cebcd2 git | Not specified |
| CNA | Linux | Linux | affected d0c3601f2c4e12e7689b0f46ebc17525250ea8c3 f737d999fcb8f276d77b01ea4c2016ee01dad19b git | Not specified |
| CNA | Linux | Linux | affected d0c3601f2c4e12e7689b0f46ebc17525250ea8c3 5710f6a74f63cbba0e15cd75917234916181c9d4 git | Not specified |
| CNA | Linux | Linux | affected d0c3601f2c4e12e7689b0f46ebc17525250ea8c3 edb39c7666bb3924da761dfb417db85c1e5d8ad3 git | Not specified |
| CNA | Linux | Linux | affected d0c3601f2c4e12e7689b0f46ebc17525250ea8c3 38b6be101006d3e7af972999f45d4f1e8250587a git | Not specified |
| CNA | Linux | Linux | affected cafa5942bd2df3d80e3eeb2deb4bc050f7761f3d git | Not specified |
| CNA | Linux | Linux | affected c81dcaa9cd0b66816c2ecb6c5df0b6afde9c7da5 git | Not specified |
| CNA | Linux | Linux | affected 19088c5378c9fea54e552d8bc7418a3aa1e06990 git | Not specified |
| CNA | Linux | Linux | affected 6.1.114 6.1.189 semver | Not specified |
| CNA | Linux | Linux | affected 6.6.58 6.6.158 semver | Not specified |
| CNA | Linux | Linux | affected 5.10.228 5.11 semver | Not specified |
| CNA | Linux | Linux | affected 5.15.169 5.16 semver | Not specified |
| CNA | Linux | Linux | affected 6.11.5 6.12 semver | Not specified |
| CNA | Linux | Linux | affected 6.12 | Not specified |
| CNA | Linux | Linux | unaffected 6.12 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.189 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.158 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.111 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.53 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.7 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/38b6be101006d3e7af972999f45d4f1e8250587a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/edb39c7666bb3924da761dfb417db85c1e5d8ad3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/054ad8e66025eb4778d840bef80c270646cebcd2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5710f6a74f63cbba0e15cd75917234916181c9d4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f737d999fcb8f276d77b01ea4c2016ee01dad19b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/afa224cabc0132ca414b9141b1a919ca2d318cd0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.