GHSA-HJV8-5WF8-79GW
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:30In the Linux kernel, the following vulnerability has been resolved:
drm: fix race between partial drm_dev_register() failure and ioctl
If drm_dev_register() fails after registering a minor (e.g. render minor registered, primary minor fails), userspace could have opened the first minor and entered a drm_dev_enter() critical section. Since the unplugged flag was never set, the ioctl proceeds while the error path tears down device resources.
Fix this by introducing drm_dev_synchronize_unplug(), which sets the unplugged flag and waits for the SRCU barrier, ensuring all in-flight drm_dev_enter() critical sections complete before cleanup proceeds; call it on the error path of drm_dev_register().
{
"affected": [],
"aliases": [
"CVE-2026-89823"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:16:48Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: fix race between partial drm_dev_register() failure and ioctl\n\nIf drm_dev_register() fails after registering a minor (e.g. render minor\nregistered, primary minor fails), userspace could have opened the first\nminor and entered a drm_dev_enter() critical section. Since the\nunplugged flag was never set, the ioctl proceeds while the error path\ntears down device resources.\n\nFix this by introducing drm_dev_synchronize_unplug(), which sets the\nunplugged flag and waits for the SRCU barrier, ensuring all in-flight\ndrm_dev_enter() critical sections complete before cleanup proceeds; call\nit on the error path of drm_dev_register().",
"id": "GHSA-hjv8-5wf8-79gw",
"modified": "2026-09-16T15:30:58Z",
"published": "2026-09-16T12:30:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89823"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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|---|
Nomenclature
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