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

Vulnerability from cvelistv5 – Published: 2025-10-24 12:24 – Updated: 2026-07-30 05:59
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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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{
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          "product": "Linux",
          "programFiles": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
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          "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."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-07-30T05:59:41.830Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/d2be773a92874a070215b51b730cb2b1eaa8fae2"
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          "url": "https://git.kernel.org/stable/c/7ce635b3d3aba43296b62b5a2d97c008bc51cbd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/afe16653e05db07d658b55245c7a2e0603f136c0"
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      "title": "vhost: Take a reference on the task in struct vhost_task.",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40024",
    "datePublished": "2025-10-24T12:24:59.199Z",
    "dateReserved": "2025-04-16T07:20:57.152Z",
    "dateUpdated": "2026-07-30T05:59:41.830Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40024",
      "date": "2026-08-04",
      "epss": "0.00144",
      "percentile": "0.04127"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:52:40+00:00",
      "cve": "CVE-2025-40024",
      "id": "CVE-2025-40024",
      "initial_release_date": "2025-10-24T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vhost: Take a reference on the task in struct vhost_task",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40024.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-19T17:47:13Z",
      "cve": "CVE-2025-40024",
      "id": "CVE-2025-40024",
      "initial_release_date": "2025-10-24T23:24:18Z",
      "product_status:first_fixed": "2",
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      "product_status:recommended": "384",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40024",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40024.json",
      "version": "36"
    }
  }
}



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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.