CVE-2022-50771 (GCVE-0-2022-50771)
Vulnerability from cvelistv5
Published
2025-12-24 13:06
Modified
2025-12-24 13:06
Severity ?
Summary
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: <TASK> 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 </TASK> 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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "programFiles": [
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              "versionType": "semver"
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              "status": "unaffected",
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          "lang": "en",
          "value": "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()."
        }
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        "dateUpdated": "2025-12-24T13:06:00.412Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/ceb1c8c9b8aa9199da46a0f29d2d5f08d9b44c15"
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      "title": "rcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()",
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    "cveId": "CVE-2022-50771",
    "datePublished": "2025-12-24T13:06:00.412Z",
    "dateReserved": "2025-12-24T13:02:21.546Z",
    "dateUpdated": "2025-12-24T13:06:00.412Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50771\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:03.917\",\"lastModified\":\"2025-12-24T13:16:03.917\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3d92527a919edd1aa381bdd6c299dd75a8167396\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a52380b8193cf8be6c4a6b94b86ef64ed80c0dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/80a3e7ab477b3655615fc1627c88c248d4ad28d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/98a5b1265a36e9d843a51ddd6c9fa02da50d2c57\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a74af9b937707b42c3fd041aae1ed4ce2f337307\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ceb1c8c9b8aa9199da46a0f29d2d5f08d9b44c15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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