CVE-2025-40024 (GCVE-0-2025-40024)

Vulnerability from cvelistv5 – Published: 2025-10-24 12:24 – Updated: 2025-10-24 12:24
VLAI?
Title
vhost: Take a reference on the task in struct vhost_task.
Summary
In the Linux kernel, the following vulnerability has been resolved: vhost: Take a reference on the task in struct vhost_task. vhost_task_create() creates a task and keeps a reference to its task_struct. That task may exit early via a signal and its task_struct will be released. A pending vhost_task_wake() will then attempt to wake the task and access a task_struct which is no longer there. Acquire a reference on the task_struct while creating the thread and release the reference while the struct vhost_task itself is removed. If the task exits early due to a signal, then the vhost_task_wake() will still access a valid task_struct. The wake is safe and will be skipped in this case.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f9010dbdce911ee1f1af1398a24b1f9f992e0080 , < 82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0 (git)
Affected: f9010dbdce911ee1f1af1398a24b1f9f992e0080 , < d2be773a92874a070215b51b730cb2b1eaa8fae2 (git)
Affected: f9010dbdce911ee1f1af1398a24b1f9f992e0080 , < 7ce635b3d3aba43296b62b5a2d97c008bc51cbd2 (git)
Affected: f9010dbdce911ee1f1af1398a24b1f9f992e0080 , < afe16653e05db07d658b55245c7a2e0603f136c0 (git)
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    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.109 , ≤ 6.6.* (semver)
Unaffected: 6.12.50 , ≤ 6.12.* (semver)
Unaffected: 6.16.10 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/vhost_task.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.4"
            },
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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            {
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.109",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.50",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.17",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: Take a reference on the task in struct vhost_task.\n\nvhost_task_create() creates a task and keeps a reference to its\ntask_struct. That task may exit early via a signal and its task_struct\nwill be released.\nA pending vhost_task_wake() will then attempt to wake the task and\naccess a task_struct which is no longer there.\n\nAcquire a reference on the task_struct while creating the thread and\nrelease the reference while the struct vhost_task itself is removed.\nIf the task exits early due to a signal, then the vhost_task_wake() will\nstill access a valid task_struct. The wake is safe and will be skipped\nin this case."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-24T12:24:59.199Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2be773a92874a070215b51b730cb2b1eaa8fae2"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ce635b3d3aba43296b62b5a2d97c008bc51cbd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/afe16653e05db07d658b55245c7a2e0603f136c0"
        }
      ],
      "title": "vhost: Take a reference on the task in struct vhost_task.",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40024",
    "datePublished": "2025-10-24T12:24:59.199Z",
    "dateReserved": "2025-04-16T07:20:57.152Z",
    "dateUpdated": "2025-10-24T12:24:59.199Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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