GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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 · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:33 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed 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)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-48921",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:33:28.558357Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-12T17:33:01.045Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8f317cd888059c59e2fa924bf4b0957cfa53f78e",
              "status": "affected",
              "version": "c85c6fadbef0a3eab41540ea628fa8fe8928c820",
              "versionType": "git"
            },
            {
              "lessThan": "e0bcd6b5779352aed88f2e538a82a39f1a7715bb",
              "status": "affected",
              "version": "3869eecf050416a1d19bac60926f6b5d64b0aa58",
              "versionType": "git"
            },
            {
              "lessThan": "589a954daab5e18399860b6c8ffaeaf79844eb20",
              "status": "affected",
              "version": "4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a",
              "versionType": "git"
            },
            {
              "lessThan": "13765de8148f71fa795e0a6607de37c49ea5915a",
              "status": "affected",
              "version": "4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "25d40b828fb855ee62e1039c65a666c9afd60786",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.137",
              "status": "affected",
              "version": "5.10.80",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.27",
              "status": "affected",
              "version": "5.15.3",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15",
              "status": "affected",
              "version": "5.14.19",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.137",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.137",
                  "versionStartIncluding": "5.10.80",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.27",
                  "versionStartIncluding": "5.15.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16.13",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.14.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix fault in reweight_entity\n\nSyzbot found a GPF in reweight_entity. 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:21:05.775Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8f317cd888059c59e2fa924bf4b0957cfa53f78e"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0bcd6b5779352aed88f2e538a82a39f1a7715bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/589a954daab5e18399860b6c8ffaeaf79844eb20"
        },
        {
          "url": "https://git.kernel.org/stable/c/13765de8148f71fa795e0a6607de37c49ea5915a"
        }
      ],
      "title": "sched/fair: Fix fault in reweight_entity",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48921",
    "datePublished": "2024-08-22T01:32:53.131Z",
    "dateReserved": "2024-08-21T06:06:23.295Z",
    "dateUpdated": "2026-05-23T15:21:05.775Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-48921",
      "date": "2026-09-18",
      "epss": "0.00168",
      "percentile": "0.06477"
    },
    "fkie_nvd": {
      "configurations": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "82480749-56E0-4A46-85BF-C3C44B1F8706",
                  "versionEndExcluding": "5.10.137",
                  "versionStartIncluding": "5.10.80",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "CC24A46F-AAF0-46A3-9255-D235078D50BC",
                  "versionEndExcluding": "5.15",
                  "versionStartIncluding": "5.14.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "61C603D7-C7CD-4505-AF1B-EBFDD4D152AF",
                  "versionEndExcluding": "5.15.27",
                  "versionStartIncluding": "5.15.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "B871B667-EDC0-435D-909E-E918D8D90995",
                  "versionEndExcluding": "5.16.13",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*",
                  "matchCriteriaId": "7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*",
                  "matchCriteriaId": "E6E34B23-78B4-4516-9BD8-61B33F4AC49A",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*",
                  "matchCriteriaId": "C030FA3D-03F4-4FB9-9DBF-D08E5CAC51AA",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix fault in reweight_entity\n\nSyzbot found a GPF in reweight_entity. 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."
        },
        {
          "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 TASK_NEW."
        }
      ],
      "id": "CVE-2022-48921",
      "lastModified": "2024-09-12T12:58:50.660",
      "metrics": {
        "cvssMetricV31": [
          {
            "cvssData": {
              "attackComplexity": "HIGH",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 4.7,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            },
            "exploitabilityScore": 1.0,
            "impactScore": 3.6,
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      },
      "published": "2024-08-22T02:15:08.197",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/13765de8148f71fa795e0a6607de37c49ea5915a"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/589a954daab5e18399860b6c8ffaeaf79844eb20"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/8f317cd888059c59e2fa924bf4b0957cfa53f78e"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/e0bcd6b5779352aed88f2e538a82a39f1a7715bb"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-362"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "kernel/sched/core.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "8f317cd888059c59e2fa924bf4b0957cfa53f78e",
                    "status": "affected",
                    "version": "c85c6fadbef0a3eab41540ea628fa8fe8928c820",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e0bcd6b5779352aed88f2e538a82a39f1a7715bb",
                    "status": "affected",
                    "version": "3869eecf050416a1d19bac60926f6b5d64b0aa58",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "589a954daab5e18399860b6c8ffaeaf79844eb20",
                    "status": "affected",
                    "version": "4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "13765de8148f71fa795e0a6607de37c49ea5915a",
                    "status": "affected",
                    "version": "4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "25d40b828fb855ee62e1039c65a666c9afd60786",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5.10.137",
                    "status": "affected",
                    "version": "5.10.80",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "5.15.27",
                    "status": "affected",
                    "version": "5.15.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "5.15",
                    "status": "affected",
                    "version": "5.14.19",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "kernel/sched/core.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.16"
                  },
                  {
                    "lessThan": "5.16",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.137",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.27",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.16.*",
                    "status": "unaffected",
                    "version": "5.16.13",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "5.17",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "82480749-56E0-4A46-85BF-C3C44B1F8706",
                    "versionEndExcluding": "5.10.137",
                    "versionStartIncluding": "5.10.80",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "CC24A46F-AAF0-46A3-9255-D235078D50BC",
                    "versionEndExcluding": "5.15",
                    "versionStartIncluding": "5.14.19",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "61C603D7-C7CD-4505-AF1B-EBFDD4D152AF",
                    "versionEndExcluding": "5.15.27",
                    "versionStartIncluding": "5.15.3",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B871B667-EDC0-435D-909E-E918D8D90995",
                    "versionEndExcluding": "5.16.13",
                    "versionStartIncluding": "5.16",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "E6E34B23-78B4-4516-9BD8-61B33F4AC49A",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*",
                    "matchCriteriaId": "C030FA3D-03F4-4FB9-9DBF-D08E5CAC51AA",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix fault in reweight_entity\n\nSyzbot found a GPF in reweight_entity. 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."
          },
          {
            "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 TASK_NEW."
          }
        ],
        "id": "CVE-2022-48921",
        "lastModified": "2026-06-17T05:16:37.260",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 4.7,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2022-48921",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:33:28.558357Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-08-22T02:15:08.197",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/13765de8148f71fa795e0a6607de37c49ea5915a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/589a954daab5e18399860b6c8ffaeaf79844eb20"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8f317cd888059c59e2fa924bf4b0957cfa53f78e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e0bcd6b5779352aed88f2e538a82a39f1a7715bb"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-362"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "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": "2026-09-05T00:57:29Z",
      "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": "250",
      "product_status:recommended": "433",
      "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": "28"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2022-48921",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:33:28.558357Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:12.752Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "kernel/sched/core.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "8f317cd888059c59e2fa924bf4b0957cfa53f78e",
                  "status": "affected",
                  "version": "c85c6fadbef0a3eab41540ea628fa8fe8928c820",
                  "versionType": "git"
                },
                {
                  "lessThan": "e0bcd6b5779352aed88f2e538a82a39f1a7715bb",
                  "status": "affected",
                  "version": "3869eecf050416a1d19bac60926f6b5d64b0aa58",
                  "versionType": "git"
                },
                {
                  "lessThan": "589a954daab5e18399860b6c8ffaeaf79844eb20",
                  "status": "affected",
                  "version": "4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a",
                  "versionType": "git"
                },
                {
                  "lessThan": "13765de8148f71fa795e0a6607de37c49ea5915a",
                  "status": "affected",
                  "version": "4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "25d40b828fb855ee62e1039c65a666c9afd60786",
                  "versionType": "git"
                },
                {
                  "lessThan": "5.10.137",
                  "status": "affected",
                  "version": "5.10.80",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.15.27",
                  "status": "affected",
                  "version": "5.15.3",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.15",
                  "status": "affected",
                  "version": "5.14.19",
                  "versionType": "semver"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "kernel/sched/core.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.16"
                },
                {
                  "lessThan": "5.16",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.137",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.27",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.16.*",
                  "status": "unaffected",
                  "version": "5.16.13",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.137",
                      "versionStartIncluding": "5.10.80",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.27",
                      "versionStartIncluding": "5.15.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16.13",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.17",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "5.14.19",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix fault in reweight_entity\n\nSyzbot found a GPF in reweight_entity. 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."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-23T15:21:05.775Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/8f317cd888059c59e2fa924bf4b0957cfa53f78e"
            },
            {
              "url": "https://git.kernel.org/stable/c/e0bcd6b5779352aed88f2e538a82a39f1a7715bb"
            },
            {
              "url": "https://git.kernel.org/stable/c/589a954daab5e18399860b6c8ffaeaf79844eb20"
            },
            {
              "url": "https://git.kernel.org/stable/c/13765de8148f71fa795e0a6607de37c49ea5915a"
            }
          ],
          "title": "sched/fair: Fix fault in reweight_entity",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48921",
        "datePublished": "2024-08-22T01:32:53.131Z",
        "dateReserved": "2024-08-21T06:06:23.295Z",
        "dateUpdated": "2026-05-23T15:21:05.775Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.