GHSA-H4XG-972W-F7C3
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In 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:
- 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
- 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.
{
"affected": [],
"aliases": [
"CVE-2026-98008"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:29Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: fix NULL pointer dereference on unbind with fixed-link\n\nWhen the device tree describes a fixed-link and has no \"mdio\" child\nnode, macb_mii_init() returns early without allocating the MDIO bus,\nleaving bp-\u003emii_bus as NULL.\n\nTwo cleanup paths then dereference this NULL bus:\n\n1. On driver unbind, macb_remove() unconditionally calls\n mdiobus_unregister(bp-\u003emii_bus), which oopses:\n\n Unable to handle kernel NULL pointer dereference at virtual address 00000000000004a8\n pc : mdiobus_unregister+0x14/0xa4\n lr : macb_remove+0x38/0xa4\n Call trace:\n mdiobus_unregister+0x14/0xa4 (P)\n macb_remove+0x38/0xa4\n platform_remove+0x20/0x30\n device_release_driver_internal+0x1c8/0x224\n unbind_store+0xb4/0xbc\n\n2. On the probe error path in macb_probe(), reached when\n macb_mii_init() has succeeded but a subsequent step fails, the\n err_out_unregister_mdio label runs the same unconditional cleanup.\n\nmdiobus_unregister() and mdiobus_free() do not guard against a NULL\nbus, so guard the calls in both macb_remove() and the probe error\npath.",
"id": "GHSA-h4xg-972w-f7c3",
"modified": "2026-09-25T12:31:32Z",
"published": "2026-09-25T12:31:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98008"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/38b6be101006d3e7af972999f45d4f1e8250587a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5710f6a74f63cbba0e15cd75917234916181c9d4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/edb39c7666bb3924da761dfb417db85c1e5d8ad3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f737d999fcb8f276d77b01ea4c2016ee01dad19b"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.