ghsa-m38r-m4xr-gxwh
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
rcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()
Running rcutorture with non-zero fqs_duration module parameter in a kernel built with CONFIG_PREEMPTION=y results in the following splat:
BUG: using __this_cpu_read() in preemptible [00000000] code: rcu_torture_fqs/398 caller is __this_cpu_preempt_check+0x13/0x20 CPU: 3 PID: 398 Comm: rcu_torture_fqs Not tainted 6.0.0-rc1-yoctodev-standard+ Call Trace: dump_stack_lvl+0x5b/0x86 dump_stack+0x10/0x16 check_preemption_disabled+0xe5/0xf0 __this_cpu_preempt_check+0x13/0x20 rcu_force_quiescent_state.part.0+0x1c/0x170 rcu_force_quiescent_state+0x1e/0x30 rcu_torture_fqs+0xca/0x160 ? rcu_torture_boost+0x430/0x430 kthread+0x192/0x1d0 ? kthread_complete_and_exit+0x30/0x30 ret_from_fork+0x22/0x30
The problem is that rcu_force_quiescent_state() uses __this_cpu_read() in preemptible code instead of the proper raw_cpu_read(). This commit therefore changes __this_cpu_read() to raw_cpu_read().
{
"affected": [],
"aliases": [
"CVE-2022-50771"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-24T13:16:03Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()\n\nRunning rcutorture with non-zero fqs_duration module parameter in a\nkernel built with CONFIG_PREEMPTION=y results in the following splat:\n\nBUG: using __this_cpu_read() in preemptible [00000000]\ncode: rcu_torture_fqs/398\ncaller is __this_cpu_preempt_check+0x13/0x20\nCPU: 3 PID: 398 Comm: rcu_torture_fqs Not tainted 6.0.0-rc1-yoctodev-standard+\nCall Trace:\n\u003cTASK\u003e\ndump_stack_lvl+0x5b/0x86\ndump_stack+0x10/0x16\ncheck_preemption_disabled+0xe5/0xf0\n__this_cpu_preempt_check+0x13/0x20\nrcu_force_quiescent_state.part.0+0x1c/0x170\nrcu_force_quiescent_state+0x1e/0x30\nrcu_torture_fqs+0xca/0x160\n? rcu_torture_boost+0x430/0x430\nkthread+0x192/0x1d0\n? kthread_complete_and_exit+0x30/0x30\nret_from_fork+0x22/0x30\n\u003c/TASK\u003e\n\nThe problem is that rcu_force_quiescent_state() uses __this_cpu_read()\nin preemptible code instead of the proper raw_cpu_read(). This commit\ntherefore changes __this_cpu_read() to raw_cpu_read().",
"id": "GHSA-m38r-m4xr-gxwh",
"modified": "2025-12-24T15:30:34Z",
"published": "2025-12-24T15:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50771"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3d92527a919edd1aa381bdd6c299dd75a8167396"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5a52380b8193cf8be6c4a6b94b86ef64ed80c0dc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/80a3e7ab477b3655615fc1627c88c248d4ad28d9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/98a5b1265a36e9d843a51ddd6c9fa02da50d2c57"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a74af9b937707b42c3fd041aae1ed4ce2f337307"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ceb1c8c9b8aa9199da46a0f29d2d5f08d9b44c15"
}
],
"schema_version": "1.4.0",
"severity": []
}
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