GHSA-W3XQ-CQ2M-6H87
Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32In the Linux kernel, the following vulnerability has been resolved:
firmware: arm_scmi: Avoid IDR updates while cleaning channels
scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy().
The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state. The callback also cannot be protected by rcu_read_lock(), because scmi_device_destroy() may sleep.
Leave IDR teardown to the following idr_destroy() call and keep the callback limited to device destruction.
{
"affected": [],
"aliases": [
"CVE-2026-93086"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:18:02Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Avoid IDR updates while cleaning channels\n\nscmi_cleanup_channels() walks the TX/RX channel IDRs with\nidr_for_each() to free transport resources and destroy the dedicated\ntransport devices before calling idr_destroy().\n\nThe destroy callback removed each entry from the same IDR being walked.\nThat is not needed for this cleanup path, and it is unsafe because\nidr_for_each() has not advanced its radix-tree iterator while the\ncallback is running. Removing the current entry from the callback can\ninvalidate the iterator state. The callback also cannot be protected by\nrcu_read_lock(), because scmi_device_destroy() may sleep.\n\nLeave IDR teardown to the following idr_destroy() call and keep the\ncallback limited to device destruction.",
"id": "GHSA-w3xq-cq2m-6h87",
"modified": "2026-09-17T18:32:09Z",
"published": "2026-09-17T18:32:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93086"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/431c6b872ba7fedcc5a3afb0ec3517db4d95d088"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/54e5a4f7d83db4552d963d0785be32d9df680dcd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aed24a3c63920539e9de7fbfe7929a2e7c888cd2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bab26acebe55e8ad3ab545abda72faa7ca28c477"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c38b1e19485aaa820e52cfe162525a8af67563da"
}
],
"schema_version": "1.4.0",
"severity": []
}
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