GHSA-V77C-JW3G-56GH
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31In the Linux kernel, the following vulnerability has been resolved:
net: phylink: correctly validate returned PCS in phylink_inband_caps
In phylink_inband_caps(), the PCS returned by mac_select_pcs is only checked if NULL but mac_select_pcs can also return an error pointer.
This can cause a kernel panic as phylink_pcs_inband_caps() only checks if passed PCS is not NULL and directly dereference ops from the phylink_pcs struct.
Use the IS_ERR_OR_NULL macro to address both case where the returned PCS can be NULL or an error pointer and prevent a kernel panic.
{
"affected": [],
"aliases": [
"CVE-2026-80993"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:06Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: phylink: correctly validate returned PCS in phylink_inband_caps\n\nIn phylink_inband_caps(), the PCS returned by mac_select_pcs is only\nchecked if NULL but mac_select_pcs can also return an error pointer.\n\nThis can cause a kernel panic as phylink_pcs_inband_caps() only checks\nif passed PCS is not NULL and directly dereference ops from the phylink_pcs\nstruct.\n\nUse the IS_ERR_OR_NULL macro to address both case where the returned\nPCS can be NULL or an error pointer and prevent a kernel panic.",
"id": "GHSA-v77c-jw3g-56gh",
"modified": "2026-09-11T21:31:23Z",
"published": "2026-09-11T21:31:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80993"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b6b533f83461c3730875cf3ed5ff6362dcb67be9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f2849b1fd059ec9b3281b771e6ac5aad9feee851"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fb4d77553841ae85bed9b2cf03351c401e871d85"
}
],
"schema_version": "1.4.0",
"severity": []
}
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