CVE-2022-48921 (GCVE-0-2022-48921)

Vulnerability from cvelistv5 – Published: 2024-08-22 01:32 – Updated: 2026-05-23 15:21
VLAI
Title
sched/fair: Fix fault in reweight_entity
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/fair: Fix fault in reweight_entity Syzbot found a GPF in reweight_entity. This has been bisected to commit 4ef0c5c6b5ba ("kernel/sched: Fix sched_fork() access an invalid sched_task_group") There is a race between sched_post_fork() and setpriority(PRIO_PGRP) within a thread group that causes a null-ptr-deref in reweight_entity() in CFS. The scenario is that the main process spawns number of new threads, which then call setpriority(PRIO_PGRP, 0, -20), wait, and exit. For each of the new threads the copy_process() gets invoked, which adds the new task_struct and calls sched_post_fork() for it. In the above scenario there is a possibility that setpriority(PRIO_PGRP) and set_one_prio() will be called for a thread in the group that is just being created by copy_process(), and for which the sched_post_fork() has not been executed yet. This will trigger a null pointer dereference in reweight_entity(), as it will try to access the run queue pointer, which hasn't been set. Before the mentioned change the cfs_rq pointer for the task has been set in sched_fork(), which is called much earlier in copy_process(), before the new task is added to the thread_group. Now it is done in the sched_post_fork(), which is called after that. To fix the issue the remove the update_load param from the update_load param() function and call reweight_task() only if the task flag doesn't have the TASK_NEW flag set.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c85c6fadbef0a3eab41540ea628fa8fe8928c820 , < 8f317cd888059c59e2fa924bf4b0957cfa53f78e (git)
Affected: 3869eecf050416a1d19bac60926f6b5d64b0aa58 , < e0bcd6b5779352aed88f2e538a82a39f1a7715bb (git)
Affected: 4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a , < 589a954daab5e18399860b6c8ffaeaf79844eb20 (git)
Affected: 4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a , < 13765de8148f71fa795e0a6607de37c49ea5915a (git)
Affected: 25d40b828fb855ee62e1039c65a666c9afd60786 (git)
Affected: 5.10.80 , < 5.10.137 (semver)
Affected: 5.15.3 , < 5.15.27 (semver)
Affected: 5.14.19 , < 5.15 (semver)
Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 5.10.137 , ≤ 5.10.* (semver)
Unaffected: 5.15.27 , ≤ 5.15.* (semver)
Unaffected: 5.16.13 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "id": "CVE-2022-48921",
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To fix the issue\\nthe remove the update_load param from the update_load param() function\\nand call reweight_task() only if the task flag doesn\u0027t have the\\nTASK_NEW flag set.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: sched/fair: Solucionar falla en reweight_entity Syzbot encontr\u00f3 un GPF en reweight_entity. Esto se ha dividido en dos para el commit 4ef0c5c6b5ba (\\\"kernel/sched: Fix sched_fork() accede a un sched_task_group no v\u00e1lido\\\") Hay una ejecuci\u00f3n entre sched_post_fork() y setpriority(PRIO_PGRP) dentro de un grupo de subprocesos que provoca un null-ptr-deref en reweight_entity () en el SFC. El escenario es que el proceso principal genera una cantidad de subprocesos nuevos, que luego llaman a setpriority(PRIO_PGRP, 0, -20), esperan y salen. Para cada uno de los nuevos subprocesos, se invoca copy_process(), lo que agrega la nueva task_struct y llama a sched_post_fork() para ello. En el escenario anterior existe la posibilidad de que se llame a setpriority(PRIO_PGRP) y set_one_prio() para un subproceso en el grupo que acaba de crear copy_process(), y para el cual sched_post_fork() a\u00fan no se ha ejecutado. Esto desencadenar\u00e1 una desreferencia del puntero nulo en reweight_entity(), ya que intentar\u00e1 acceder al puntero de la cola de ejecuci\u00f3n, que no se ha configurado. Antes del cambio mencionado, el puntero cfs_rq para la tarea se configur\u00f3 en sched_fork(), que se llama mucho antes en copy_process(), antes de que la nueva tarea se agregue al thread_group. Ahora se hace en sched_post_fork(), que se llama despu\u00e9s de eso. Para solucionar el problema, elimine el par\u00e1metro update_load de la funci\u00f3n update_load param() y llame a reweight_task() solo si el indicador de tarea no tiene establecido el indicador 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T13:57:41+00:00",
      "cve": "CVE-2022-48921",
      "id": "CVE-2022-48921",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "324",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "72",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sched/fair: Fix fault in reweight_entity",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48921.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-24T01:15:54Z",
      "cve": "CVE-2022-48921",
      "id": "CVE-2022-48921",
      "initial_release_date": "2025-02-14T07:11:43Z",
      "product_status:known_affected": "310",
      "product_status:known_not_affected": "154",
      "product_status:recommended": "413",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-48921",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-48921.json",
      "version": "24"
    },
    "vulnrichment": {
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This has been bisected to\\ncommit 4ef0c5c6b5ba (\\\"kernel/sched: Fix sched_fork() access an invalid\\nsched_task_group\\\")\\n\\nThere\\u00a0is a race between sched_post_fork() and setpriority(PRIO_PGRP)\\nwithin a thread group that causes a null-ptr-deref\\u00a0in\\nreweight_entity() in CFS. The scenario is that the main process spawns\\nnumber of new threads, which then call setpriority(PRIO_PGRP, 0, -20),\\nwait, and exit.  For each of the new threads the copy_process() gets\\ninvoked, which adds the new task_struct and calls sched_post_fork()\\nfor it.\\n\\nIn the above scenario there is a possibility that\\nsetpriority(PRIO_PGRP) and set_one_prio() will be called for a thread\\nin the group that is just being created by copy_process(), and for\\nwhich the sched_post_fork() has not been executed yet. This will\\ntrigger a null pointer dereference in reweight_entity(),\\u00a0as it will\\ntry to access the run queue pointer, which hasn\u0027t been set.\\n\\nBefore the mentioned change the cfs_rq pointer for the task  has been\\nset in sched_fork(), which is called much earlier in copy_process(),\\nbefore the new task is added to the thread_group.  Now it is done in\\nthe sched_post_fork(), which is called after that.  To fix the issue\\nthe remove the update_load param from the update_load param() function\\nand call reweight_task() only if the task flag doesn\u0027t have the\\nTASK_NEW flag set.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.137\", \"versionStartIncluding\": \"5.10.80\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.27\", \"versionStartIncluding\": \"5.15.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.13\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.14.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:21:05.775Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48921\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:21:05.775Z\", \"dateReserved\": \"2024-08-21T06:06:23.295Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-22T01:32:53.131Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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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.