GHSA-H262-73J6-24H2
Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-11 09:30In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Remove redundant css_put() in scx_cgroup_init()
The iterator css_for_each_descendant_pre() walks the cgroup hierarchy under cgroup_lock(). It does not increment the reference counts on yielded css structs.
According to the cgroup documentation, css_put() should only be used to release a reference obtained via css_get() or css_tryget_online(). Since the iterator does not use either of these to acquire a reference, calling css_put() in the error path of scx_cgroup_init() causes a refcount underflow.
Remove the unbalanced css_put() to prevent a potential Use-After-Free (UAF) vulnerability.
{
"affected": [],
"aliases": [
"CVE-2026-43438"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-08T15:16:56Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Remove redundant css_put() in scx_cgroup_init()\n\nThe iterator css_for_each_descendant_pre() walks the cgroup hierarchy\nunder cgroup_lock(). It does not increment the reference counts on\nyielded css structs.\n\nAccording to the cgroup documentation, css_put() should only be used\nto release a reference obtained via css_get() or css_tryget_online().\nSince the iterator does not use either of these to acquire a reference,\ncalling css_put() in the error path of scx_cgroup_init() causes a\nrefcount underflow.\n\nRemove the unbalanced css_put() to prevent a potential Use-After-Free\n(UAF) vulnerability.",
"id": "GHSA-h262-73j6-24h2",
"modified": "2026-05-11T09:30:31Z",
"published": "2026-05-08T15:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43438"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1336b579f6079fb8520be03624fcd9ba443c930b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6eaaa67d6998f6c30c462b140db8c062e07ec473"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bf50f3285eda8a0173625fcdb5f183f96e1008cd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cc095cd305fddbe25a968e4a78436ff9476cf0f6"
}
],
"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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