{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-21657", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.731Z", "datePublished": "2025-01-21T12:18:13.893Z", "dateUpdated": "2026-05-11T21:03:55.074Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:03:55.074Z"}, "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->balance_callback && rq->balance_callback != &balance_push_callback\n[ 6.615208] WARNING: CPU: 2 PID: 0 at kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90\n===== END ====="}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/ext.c"], "versions": [{"version": "0e7ffff1b8117b05635c87d3c9099f6aa9c9b689", "lessThan": "d9e446dd63cee7161717a6a8414ba9c6435af764", "status": "affected", "versionType": "git"}, {"version": "0e7ffff1b8117b05635c87d3c9099f6aa9c9b689", "lessThan": "6268d5bc10354fc2ab8d44a0cd3b042d49a0417e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/ext.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.10", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d9e446dd63cee7161717a6a8414ba9c6435af764"}, {"url": "https://git.kernel.org/stable/c/6268d5bc10354fc2ab8d44a0cd3b042d49a0417e"}], "title": "sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"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", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc6:*:*:*:*:*:*", "matchCriteriaId": "24B88717-53F5-42AA-9B72-14C707639E3F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc7:*:*:*:*:*:*", "matchCriteriaId": "1EF8CD82-1EAE-4254-9545-F85AB94CF90F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*", "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}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*", "matchCriteriaId": "034C36A6-C481-41F3-AE9A-D116E5BE6895", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*", "matchCriteriaId": "8AF9DC49-2085-4FFB-A7E3-73DFAFECC7F2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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->balance_callback && rq->balance_callback != &balance_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->balance_callback && rq->balance_callback != &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": "2025-10-15T13:48:46.157", "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"}]}

{"bugzilla": {"description": "kernel: sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()", "id": "2339135", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2339135"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()\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().\nWithout this change, we observe the following warning:\n===== START =====\n[ 6.615205] rq->balance_callback && rq->balance_callback != &balance_push_callback\n[ 6.615208] WARNING: CPU: 2 PID: 0 at kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90\n===== END ====="], "name": "CVE-2025-21657", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-01-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21657\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21657\nhttps://lore.kernel.org/linux-cve-announce/2025012131-CVE-2025-21657-5f7d@gregkh/T"], "threat_severity": "Low"}

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