GHSA-353R-JVG2-63V3
Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-10-30 15:33In the Linux kernel, the following vulnerability has been resolved:
i3c: master: Fix use-after-free of master->this
sysfs attribute callbacks for the master controller device dereference master->this. However, master->this is freed in i3c_master_detach_free_devs() before the master device itself is released.
As a result, sysfs accesses can dereference a freed master->this pointer, leading to a use-after-free.
Keep master->this alive until i3c_masterdev_release(), which is called after the master device and its sysfs state are being torn down. Do not free master->this as part of the normal device detach path.
On the error path in i3c_master_set_info(), reset master->this and bus.cur_master to NULL before freeing the allocated device.
{
"affected": [],
"aliases": [
"CVE-2026-93200"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:18:16Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: master: Fix use-after-free of master-\u003ethis\n\nsysfs attribute callbacks for the master controller device dereference\nmaster-\u003ethis. However, master-\u003ethis is freed in\ni3c_master_detach_free_devs() before the master device itself is\nreleased.\n\nAs a result, sysfs accesses can dereference a freed master-\u003ethis\npointer, leading to a use-after-free.\n\nKeep master-\u003ethis alive until i3c_masterdev_release(), which is called\nafter the master device and its sysfs state are being torn down. Do not\nfree master-\u003ethis as part of the normal device detach path.\n\nOn the error path in i3c_master_set_info(), reset master-\u003ethis and\nbus.cur_master to NULL before freeing the allocated device.",
"id": "GHSA-353r-jvg2-63v3",
"modified": "2026-10-30T15:33:42Z",
"published": "2026-09-17T18:32:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93200"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/027679d613ea73b8a00831369ec34eea804ce1bd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/23a1c4288a60e253a05a882bd8928ed61beb4a48"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4f3145db05fede36b35f8249b8acde5bd5d54864"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/50034d8d0f797c3a7a599f750a7d3e792e80dea5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/94af669037d129914828a851d8b2a79b4537b73f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a9b9cae0bd887ef0d438887f20b0a417491e45f0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e766605a0490723df7b61e6abd0c392889732dd7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/feb0ed76601f3c2f91f08688c5a7d8b9d382f720"
}
],
"schema_version": "1.4.0",
"severity": []
}
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