ghsa-256h-gf49-r65r
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
thermal: intel_powerclamp: Use get_cpu() instead of smp_processor_id() to avoid crash
When CPU 0 is offline and intel_powerclamp is used to inject idle, it generates kernel BUG:
BUG: using smp_processor_id() in preemptible [00000000] code: bash/15687 caller is debug_smp_processor_id+0x17/0x20 CPU: 4 PID: 15687 Comm: bash Not tainted 5.19.0-rc7+ #57 Call Trace: dump_stack_lvl+0x49/0x63 dump_stack+0x10/0x16 check_preemption_disabled+0xdd/0xe0 debug_smp_processor_id+0x17/0x20 powerclamp_set_cur_state+0x7f/0xf9 [intel_powerclamp] ... ...
Here CPU 0 is the control CPU by default and changed to the current CPU, if CPU 0 offlined. This check has to be performed under cpus_read_lock(), hence the above warning.
Use get_cpu() instead of smp_processor_id() to avoid this BUG.
[ rjw: Subject edits ]
{
"affected": [],
"aliases": [
"CVE-2022-50494"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-04T16:15:46Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nthermal: intel_powerclamp: Use get_cpu() instead of smp_processor_id() to avoid crash\n\nWhen CPU 0 is offline and intel_powerclamp is used to inject\nidle, it generates kernel BUG:\n\nBUG: using smp_processor_id() in preemptible [00000000] code: bash/15687\ncaller is debug_smp_processor_id+0x17/0x20\nCPU: 4 PID: 15687 Comm: bash Not tainted 5.19.0-rc7+ #57\nCall Trace:\n\u003cTASK\u003e\ndump_stack_lvl+0x49/0x63\ndump_stack+0x10/0x16\ncheck_preemption_disabled+0xdd/0xe0\ndebug_smp_processor_id+0x17/0x20\npowerclamp_set_cur_state+0x7f/0xf9 [intel_powerclamp]\n...\n...\n\nHere CPU 0 is the control CPU by default and changed to the current CPU,\nif CPU 0 offlined. This check has to be performed under cpus_read_lock(),\nhence the above warning.\n\nUse get_cpu() instead of smp_processor_id() to avoid this BUG.\n\n[ rjw: Subject edits ]",
"id": "GHSA-256h-gf49-r65r",
"modified": "2025-10-04T18:31:14Z",
"published": "2025-10-04T18:31:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50494"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0f91f66c568b316b19cb042cf50584467b3bdff4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3e799e815097febbcb81b472285be824f5d089f9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/418fae0700e85a498062424f8656435c32cdb200"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/513943bf879d45005213e6f5cfb7d9e9943f589f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5614908434451aafbf9b24cb5247cf1d21269f76"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5a646c38f648185ee2c62f2a19da3c6f04e27612"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/68b99e94a4a2db6ba9b31fe0485e057b9354a640"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6904727db0eb62fb0c2dce1cf331c341d97ee4b7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6e2a347b304224b2aeb1c0ea000d1cf8a02cc592"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
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