CVE-2026-23371

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(running_bw underflow)\n Call trace:\n dequeue_task_dl+0x15c/0x1f8 (P)\n dequeue_task+0x80/0x168\n deactivate_task+0x24/0x50\n push_dl_task+0x264/0x2e0\n dl_task_timer+0x1b0/0x228\n __hrtimer_run_queues+0x188/0x378\n hrtimer_interrupt+0xfc/0x260\n ...\n\nThe problem is that when a SCHED_DEADLINE task (lock holder) is\nchanged to a lower priority class via sched_setscheduler(), it may\nfail to properly inherit the parameters of potential DEADLINE donors\nif it didn't already inherit them in the past (shorter deadline than\ndonor's at that time). This might lead to bandwidth accounting\ncorruption, as enqueue_task_dl() won't recognize the lock holder as\nboosted.\n\nThe scenario occurs when:\n1. A DEADLINE task (donor) blocks on a PI mutex held by another\n DEADLINE task (holder), but the holder doesn't inherit parameters\n (e.g., it already has a shorter deadline)\n2. sched_setscheduler() changes the holder from DEADLINE to a lower\n class while still holding the mutex\n3. The holder should now inherit DEADLINE parameters from the donor\n and be enqueued with ENQUEUE_REPLENISH, but this doesn't happen\n\nFix the issue by introducing __setscheduler_dl_pi(), which detects when\na DEADLINE (proper or boosted) task gets setscheduled to a lower\npriority class. In case, the function makes the task inherit DEADLINE\nparameters of the donoer (pi_se) and sets ENQUEUE_REPLENISH flag to\nensure proper bandwidth accounting during the next enqueue operation."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/syscalls.c"], "versions": [{"version": "2279f540ea7d05f22d2f0c4224319330228586bc", "lessThan": "e0e20852d44261a9d69188bc483872930e7ba727", "status": "affected", "versionType": "git"}, {"version": "2279f540ea7d05f22d2f0c4224319330228586bc", "lessThan": "ce6253fe718811cceb3a0ae0dbf0a5941dea3eb6", "status": "affected", "versionType": "git"}, {"version": "2279f540ea7d05f22d2f0c4224319330228586bc", "lessThan": "65af3633caf195d397ec4c39f51ae7615bd5a627", "status": "affected", "versionType": "git"}, {"version": "2279f540ea7d05f22d2f0c4224319330228586bc", "lessThan": "0638bf16b7a73a2fe63624bd0d16d9fd904805c3", "status": "affected", "versionType": "git"}, {"version": "2279f540ea7d05f22d2f0c4224319330228586bc", "lessThan": "ba1c22924ddcc280672a2a06a9ca99ee3a1b92c3", "status": "affected", "versionType": "git"}, {"version": "2279f540ea7d05f22d2f0c4224319330228586bc", "lessThan": "d658686a1331db3bb108ca079d76deb3208ed949", "status": "affected", "versionType": "git"}, {"version": "3cc3d77dc541181f97f1dc96d2977ef8359fd760", "status": "affected", "versionType": "git"}, {"version": "d2b65976bf1ae9d0d9dd5770cd01695559438309", "status": "affected", "versionType": "git"}, {"version": "4.19.257", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "5.4.212", "lessThan": "5.5", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/syscalls.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.7", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "5.10", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.19.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.257"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.212"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e0e20852d44261a9d69188bc483872930e7ba727"}, {"url": "https://git.kernel.org/stable/c/ce6253fe718811cceb3a0ae0dbf0a5941dea3eb6"}, {"url": "https://git.kernel.org/stable/c/65af3633caf195d397ec4c39f51ae7615bd5a627"}, {"url": "https://git.kernel.org/stable/c/0638bf16b7a73a2fe63624bd0d16d9fd904805c3"}, {"url": "https://git.kernel.org/stable/c/ba1c22924ddcc280672a2a06a9ca99ee3a1b92c3"}, {"url": "https://git.kernel.org/stable/c/d658686a1331db3bb108ca079d76deb3208ed949"}], "title": "sched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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(running_bw underflow)\n Call trace:\n dequeue_task_dl+0x15c/0x1f8 (P)\n dequeue_task+0x80/0x168\n deactivate_task+0x24/0x50\n push_dl_task+0x264/0x2e0\n dl_task_timer+0x1b0/0x228\n __hrtimer_run_queues+0x188/0x378\n hrtimer_interrupt+0xfc/0x260\n ...\n\nThe problem is that when a SCHED_DEADLINE task (lock holder) is\nchanged to a lower priority class via sched_setscheduler(), it may\nfail to properly inherit the parameters of potential DEADLINE donors\nif it didn't already inherit them in the past (shorter deadline than\ndonor's at that time). This might lead to bandwidth accounting\ncorruption, as enqueue_task_dl() won't recognize the lock holder as\nboosted.\n\nThe scenario occurs when:\n1. A DEADLINE task (donor) blocks on a PI mutex held by another\n DEADLINE task (holder), but the holder doesn't inherit parameters\n (e.g., it already has a shorter deadline)\n2. sched_setscheduler() changes the holder from DEADLINE to a lower\n class while still holding the mutex\n3. The holder should now inherit DEADLINE parameters from the donor\n and be enqueued with ENQUEUE_REPLENISH, but this doesn't happen\n\nFix the issue by introducing __setscheduler_dl_pi(), which detects when\na DEADLINE (proper or boosted) task gets setscheduled to a lower\npriority class. In case, the function makes the task inherit DEADLINE\nparameters of the donoer (pi_se) and sets ENQUEUE_REPLENISH flag to\nensure proper bandwidth accounting during the next enqueue operation."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsched/deadline: Solucionar la falta de ENQUEUE_REPLENISH durante la des-potenciaci\u00f3n PI\n\nEjecutar stress-ng --schedpolicy 0 en un kernel RT en una m\u00e1quina grande podr\u00eda llevar a las siguientes ADVERTENCIAS (editado).\n\n sched: Tarea DL des-potenciada PID 22725: Falta la bandera REPLENISH\n\n ADVERTENCIA: CPU: 93 PID: 0 en kernel/sched/deadline.c:239 dequeue_task_dl+0x15c/0x1f8\n ... (desbordamiento negativo de running_bw)\n Traza de llamada:\n dequeue_task_dl+0x15c/0x1f8 (P)\n dequeue_task+0x80/0x168\n deactivate_task+0x24/0x50\n push_dl_task+0x264/0x2e0\n dl_task_timer+0x1b0/0x228\n __hrtimer_run_queues+0x188/0x378\n hrtimer_interrupt+0xfc/0x260\n ...\n\nEl problema es que cuando una tarea SCHED_DEADLINE (poseedor del bloqueo) se cambia a una clase de prioridad inferior a trav\u00e9s de sched_setscheduler(), puede no heredar correctamente los par\u00e1metros de los posibles donantes DEADLINE si no los hered\u00f3 ya en el pasado (plazo m\u00e1s corto que el del donante en ese momento). Esto podr\u00eda llevar a la corrupci\u00f3n de la contabilidad del ancho de banda, ya que enqueue_task_dl() no reconocer\u00e1 al poseedor del bloqueo como potenciado.\n\nEl escenario ocurre cuando:\n1. Una tarea DEADLINE (donante) se bloquea en un mutex PI mantenido por otra tarea DEADLINE (poseedor), pero el poseedor no hereda los par\u00e1metros (por ejemplo, ya tiene un plazo m\u00e1s corto)\n2. sched_setscheduler() cambia el poseedor de DEADLINE a una clase inferior mientras a\u00fan mantiene el mutex\n3. El poseedor deber\u00eda ahora heredar los par\u00e1metros DEADLINE del donante y ser encolado con ENQUEUE_REPLENISH, pero esto no sucede\n\nSolucionar el problema introduciendo __setscheduler_dl_pi(), que detecta cuando una tarea DEADLINE (propia o potenciada) se programa a una clase de prioridad inferior. En ese caso, la funci\u00f3n hace que la tarea herede los par\u00e1metros DEADLINE del donante (pi_se) y establece la bandera ENQUEUE_REPLENISH para asegurar una contabilidad adecuada del ancho de banda durante la siguiente operaci\u00f3n de encolado."}], "id": "CVE-2026-23371", "lastModified": "2026-10-30T13:18:37.290", "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": "2026-03-25T11:16:36.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0638bf16b7a73a2fe63624bd0d16d9fd904805c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65af3633caf195d397ec4c39f51ae7615bd5a627"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba1c22924ddcc280672a2a06a9ca99ee3a1b92c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ce6253fe718811cceb3a0ae0dbf0a5941dea3eb6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d658686a1331db3bb108ca079d76deb3208ed949"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e0e20852d44261a9d69188bc483872930e7ba727"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: sched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting", "id": "2451161", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451161"}, "csaw": false, "cwe": "CWE-372", "details": ["A flaw was found in the Linux kernel's `sched/deadline` component. When a `SCHED_DEADLINE` task, which is a type of real-time task, has its priority class changed to a lower setting, it may not correctly inherit parameters from other `DEADLINE` tasks. This can lead to corruption in the bandwidth accounting mechanism, potentially causing system instability or unexpected behavior."], "name": "CVE-2026-23371", "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": "2026-03-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23371\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23371\nhttps://lore.kernel.org/linux-cve-announce/2026032541-CVE-2026-23371-1b32@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2279f540ea7d05f22d2f0c4224319330228586bc,ba1c22924ddcc280672a2a06a9ca99ee3a1b92c3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2279f540ea7d05f22d2f0c4224319330228586bc,d658686a1331db3bb108ca079d76deb3208ed949)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "3cc3d77dc541181f97f1dc96d2977ef8359fd760"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d2b65976bf1ae9d0d9dd5770cd01695559438309"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.7,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-28T09:11:32.392797+00:00", "value": {"mitigation_remediation": ["Upgrade the Linux kernel to a version that includes the fix introduced by commit ba1c22924ddcc280672a2a06a9ca99ee3a1b92c3 or later.", "If an immediate kernel upgrade is not feasible, avoid running SCHED_DEADLINE tasks that hold PI mutexes, or set the scheduler prior to acquiring the lock.", "Monitor kernel log messages for the warning \"REPLENISH flag missing\"; if observed, apply the patch as soon as possible."], "summary": {"action": "Immediate Patch", "impact": "CPU resource starvation and scheduling anomalies due to corrupted bandwidth accounting"}, "threat_synthesis": {"affected_systems": "All Linux kernel releases that include the classic deadline scheduler before the patch commit are affected. The issue manifests when a DEADLINE task holds a PI mutex and is later demoted while still holding that mutex, so any distribution of Linux kernel with scheduling support can be impacted until the described fix is applied.", "description_and_impact": "A flaw in the Linux kernel\u2019s deadline scheduler causes the REPLENISH flag to be omitted when a SCHED_DEADLINE task that holds a PI mutex is demoted to a lower priority class via sched_setscheduler. The resulting bandwidth accounting corruption can lead to inaccurate CPU slice allocation, task starvation, and potential system instability. This weakness is classified as CWE-372, indicating incorrect manipulation of a calculation.", "risk_and_exploitability": "The CVSS score is 5.5, and the EPSS probability is below 1%. The vulnerability is not listed in the CISA KEV catalog, suggesting a low likelihood of widespread exploitation. An attacker would need local privileged access to create a DEADLINE task and manipulate its scheduling class while holding a PI mutex. The risk is therefore considered low to moderate, but the potential impact on system performance warrants prompt attention."}}}}, "created": "2026-03-25T21:31:44.884558+00:00", "updated": "2026-04-28T09:15:09.689049+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}