CVE-2026-23371 (GCVE-0-2026-23371)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-06-01 16:11
VLAI
Title
sched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting Running stress-ng --schedpolicy 0 on an RT kernel on a big machine might lead to the following WARNINGs (edited). sched: DL de-boosted task PID 22725: REPLENISH flag missing WARNING: CPU: 93 PID: 0 at kernel/sched/deadline.c:239 dequeue_task_dl+0x15c/0x1f8 ... (running_bw underflow) Call trace: dequeue_task_dl+0x15c/0x1f8 (P) dequeue_task+0x80/0x168 deactivate_task+0x24/0x50 push_dl_task+0x264/0x2e0 dl_task_timer+0x1b0/0x228 __hrtimer_run_queues+0x188/0x378 hrtimer_interrupt+0xfc/0x260 ... The problem is that when a SCHED_DEADLINE task (lock holder) is changed to a lower priority class via sched_setscheduler(), it may fail to properly inherit the parameters of potential DEADLINE donors if it didn't already inherit them in the past (shorter deadline than donor's at that time). This might lead to bandwidth accounting corruption, as enqueue_task_dl() won't recognize the lock holder as boosted. The scenario occurs when: 1. A DEADLINE task (donor) blocks on a PI mutex held by another DEADLINE task (holder), but the holder doesn't inherit parameters (e.g., it already has a shorter deadline) 2. sched_setscheduler() changes the holder from DEADLINE to a lower class while still holding the mutex 3. The holder should now inherit DEADLINE parameters from the donor and be enqueued with ENQUEUE_REPLENISH, but this doesn't happen Fix the issue by introducing __setscheduler_dl_pi(), which detects when a DEADLINE (proper or boosted) task gets setscheduled to a lower priority class. In case, the function makes the task inherit DEADLINE parameters of the donoer (pi_se) and sets ENQUEUE_REPLENISH flag to ensure proper bandwidth accounting during the next enqueue operation.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2279f540ea7d05f22d2f0c4224319330228586bc , < 0638bf16b7a73a2fe63624bd0d16d9fd904805c3 (git)
Affected: 2279f540ea7d05f22d2f0c4224319330228586bc , < ba1c22924ddcc280672a2a06a9ca99ee3a1b92c3 (git)
Affected: 2279f540ea7d05f22d2f0c4224319330228586bc , < d658686a1331db3bb108ca079d76deb3208ed949 (git)
Affected: 3cc3d77dc541181f97f1dc96d2977ef8359fd760 (git)
Affected: d2b65976bf1ae9d0d9dd5770cd01695559438309 (git)
Affected: 4.19.257 , < 4.20 (semver)
Affected: 5.4.212 , < 5.5 (semver)
Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23371\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:36.637\",\"lastModified\":\"2026-06-17T10:21:26.973\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting\\n\\nRunning stress-ng --schedpolicy 0 on an RT kernel on a big machine\\nmight lead to the following WARNINGs (edited).\\n\\n sched: DL de-boosted task PID 22725: REPLENISH flag missing\\n\\n WARNING: CPU: 93 PID: 0 at kernel/sched/deadline.c:239 dequeue_task_dl+0x15c/0x1f8\\n ... (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\u0027t already inherit them in the past (shorter deadline than\\ndonor\u0027s at that time). This might lead to bandwidth accounting\\ncorruption, as enqueue_task_dl() won\u0027t 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\u0027t 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\u0027t 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. 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(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. 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:31:21+00:00",
      "cve": "CVE-2026-23371",
      "id": "CVE-2026-23371",
      "initial_release_date": "2026-03-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23371.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-24T00:53:07Z",
      "cve": "CVE-2026-23371",
      "id": "CVE-2026-23371",
      "initial_release_date": "2026-03-25T16:55:20Z",
      "product_status:known_affected": "200",
      "product_status:known_not_affected": "65",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23371",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23371.json",
      "version": "8"
    }
  }
}



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Tags
Taxonomy of the tags.





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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.