GHSA-R8G8-VW6G-M8XH
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In the Linux kernel, the following vulnerability has been resolved:
ieee802154: hwsim: serialize pib updates to fix double-free
hwsim_update_pib() does an unserialized read-swap-free of phy->pib:
pib_old = rtnl_dereference(phy->pib);
...
rcu_assign_pointer(phy->pib, pib);
kfree_rcu(pib_old, rcu);
It assumes the RTNL is held, but ->set_channel is not always called under it: the mac802154 scan worker changes channels via drv_set_channel() without the RTNL. Such an update can race an RTNL-held one on the same phy; both read the same pib_old and both kfree_rcu() it, double-freeing the object. With SLUB percpu sheaves batching kfree_rcu(), this surfaces as a KASAN invalid-free in rcu_free_sheaf().
struct hwsim_phy has no lock for pib. Add one and make the swap atomic with rcu_replace_pointer() under it, dropping the misleading rtnl_dereference().
{
"affected": [],
"aliases": [
"CVE-2026-97599"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:11Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: hwsim: serialize pib updates to fix double-free\n\nhwsim_update_pib() does an unserialized read-swap-free of phy-\u003epib:\n\n\tpib_old = rtnl_dereference(phy-\u003epib);\n\t...\n\trcu_assign_pointer(phy-\u003epib, pib);\n\tkfree_rcu(pib_old, rcu);\n\nIt assumes the RTNL is held, but -\u003eset_channel is not always called\nunder it: the mac802154 scan worker changes channels via\ndrv_set_channel() without the RTNL. Such an update can race an\nRTNL-held one on the same phy; both read the same pib_old and both\nkfree_rcu() it, double-freeing the object. With SLUB percpu sheaves\nbatching kfree_rcu(), this surfaces as a KASAN invalid-free in\nrcu_free_sheaf().\n\nstruct hwsim_phy has no lock for pib. Add one and make the swap atomic\nwith rcu_replace_pointer() under it, dropping the misleading\nrtnl_dereference().",
"id": "GHSA-r8g8-vw6g-m8xh",
"modified": "2026-09-25T12:31:26Z",
"published": "2026-09-25T12:31:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97599"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/979d5b8de8ed4e1f997aef12da5694b99be7b871"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9973b3a67a7592a780ea12b08334539a900deec1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d3b8f264ce09573aededd0a97dc41c8147797d8f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/db6442deecb1f13aeaf4f9d77746ea7555630fb3"
}
],
"schema_version": "1.4.0",
"severity": []
}
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