FKIE_CVE-2025-21657
Vulnerability from fkie_nvd - Published: 2025-01-21 13:15 - Updated: 2026-06-17 08:43
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()
scx_ops_bypass() iterates all CPUs to re-enqueue all the scx tasks.
For each CPU, it acquires a lock using rq_lock() regardless of whether
a CPU is offline or the CPU is currently running a task in a higher
scheduler class (e.g., deadline). The rq_lock() is supposed to be used
for online CPUs, and the use of rq_lock() may trigger an unnecessary
warning in rq_pin_lock(). Therefore, replace rq_lock() to
raw_spin_rq_lock() in scx_ops_bypass().
Without this change, we observe the following warning:
===== START =====
[ 6.615205] rq->balance_callback && rq->balance_callback != &balance_push_callback
[ 6.615208] WARNING: CPU: 2 PID: 0 at kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90
===== END =====
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | 6.12 | |
| linux | linux_kernel | 6.12 | |
| linux | linux_kernel | 6.12 | |
| linux | linux_kernel | 6.13 | |
| linux | linux_kernel | 6.13 | |
| linux | linux_kernel | 6.13 | |
| linux | linux_kernel | 6.13 | |
| linux | linux_kernel | 6.13 | |
| linux | linux_kernel | 6.13 |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/sched/ext.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "d9e446dd63cee7161717a6a8414ba9c6435af764",
"status": "affected",
"version": "0e7ffff1b8117b05635c87d3c9099f6aa9c9b689",
"versionType": "git"
},
{
"lessThan": "6268d5bc10354fc2ab8d44a0cd3b042d49a0417e",
"status": "affected",
"version": "0e7ffff1b8117b05635c87d3c9099f6aa9c9b689",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/sched/ext.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.12"
},
{
"lessThan": "6.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "2812EE25-BBB7-4C1D-8B29-4EBB100EB7AE",
"versionEndExcluding": "6.12.10",
"versionStartIncluding": "6.12.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:-:*:*:*:*:*:*",
"matchCriteriaId": "0E698080-7669-4132-8817-4C674EEBCE54",
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},
{
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"matchCriteriaId": "24B88717-53F5-42AA-9B72-14C707639E3F",
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},
{
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"matchCriteriaId": "1EF8CD82-1EAE-4254-9545-F85AB94CF90F",
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},
{
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{
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"matchCriteriaId": "DE491969-75AE-4A6B-9A58-8FC5AF98798F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*",
"matchCriteriaId": "93C0660D-7FB8-4FBA-892A-B064BA71E49E",
"vulnerable": true
},
{
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"matchCriteriaId": "034C36A6-C481-41F3-AE9A-D116E5BE6895",
"vulnerable": true
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{
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"vulnerable": true
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],
"negate": false,
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()\n\nscx_ops_bypass() iterates all CPUs to re-enqueue all the scx tasks.\nFor each CPU, it acquires a lock using rq_lock() regardless of whether\na CPU is offline or the CPU is currently running a task in a higher\nscheduler class (e.g., deadline). The rq_lock() is supposed to be used\nfor online CPUs, and the use of rq_lock() may trigger an unnecessary\nwarning in rq_pin_lock(). Therefore, replace rq_lock() to\nraw_spin_rq_lock() in scx_ops_bypass().\n\nWithout this change, we observe the following warning:\n\n===== START =====\n[ 6.615205] rq-\u003ebalance_callback \u0026\u0026 rq-\u003ebalance_callback != \u0026balance_push_callback\n[ 6.615208] WARNING: CPU: 2 PID: 0 at kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90\n===== END ====="
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched_ext: Reemplace rq_lock() por raw_spin_rq_lock() en scx_ops_bypass() scx_ops_bypass() itera todas las CPU para volver a poner en cola todas las tareas de scx. Para cada CPU, adquiere un bloqueo mediante rq_lock() independientemente de si una CPU est\u00e1 fuera de l\u00ednea o si la CPU est\u00e1 ejecutando actualmente una tarea en una clase de programador superior (por ejemplo, fecha l\u00edmite). Se supone que rq_lock() se debe utilizar para CPU en l\u00ednea, y el uso de rq_lock() puede activar una advertencia innecesaria en rq_pin_lock(). Por lo tanto, reemplace rq_lock() por raw_spin_rq_lock() en scx_ops_bypass(). Sin este cambio, observamos la siguiente advertencia: ===== START ===== [ 6.615205] rq-\u0026gt;balance_callback \u0026amp;\u0026amp; rq-\u0026gt;balance_callback != \u0026amp;balance_push_callback [ 6.615208] ADVERTENCIA: CPU: 2 PID: 0 en kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90 ===== END ========== "
}
],
"id": "CVE-2025-21657",
"lastModified": "2026-06-17T08:43:56.990",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-01-21T13:15:09.340",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/6268d5bc10354fc2ab8d44a0cd3b042d49a0417e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/d9e446dd63cee7161717a6a8414ba9c6435af764"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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