Vulnerability-Lookup

FKIE_CVE-2025-40024

Vulnerability from fkie_nvd - Published: 2025-10-24 13:15 - Updated: 2026-07-30 06:24

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7ce635b3d3aba43296b62b5a2d97c008bc51cbd2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/afe16653e05db07d658b55245c7a2e0603f136c0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d2be773a92874a070215b51b730cb2b1eaa8fae2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "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": [
            {
              "lessThan": "82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0",
              "status": "affected",
              "version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
              "versionType": "git"
            },
            {
              "lessThan": "d2be773a92874a070215b51b730cb2b1eaa8fae2",
              "status": "affected",
              "version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
              "versionType": "git"
            },
            {
              "lessThan": "7ce635b3d3aba43296b62b5a2d97c008bc51cbd2",
              "status": "affected",
              "version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
              "versionType": "git"
            },
            {
              "lessThan": "afe16653e05db07d658b55245c7a2e0603f136c0",
              "status": "affected",
              "version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/vhost_task.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2025-40024",
  "lastModified": "2026-07-30T06:24:06.390",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-10-24T13:15:47.647",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7ce635b3d3aba43296b62b5a2d97c008bc51cbd2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/afe16653e05db07d658b55245c7a2e0603f136c0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d2be773a92874a070215b51b730cb2b1eaa8fae2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

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

Vulnerability from cvelistv5 – Published: 2025-10-24 12:24 – Updated: 2026-08-05 12:07

Title

vhost: Take a reference on the task in struct vhost_task.

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

4 references

URL	Tags
https://git.kernel.org/stable/c/82a1463c968b1a6ae…
https://git.kernel.org/stable/c/d2be773a92874a070…
https://git.kernel.org/stable/c/7ce635b3d3aba4329…
https://git.kernel.org/stable/c/afe16653e05db07d6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f9010dbdce911ee1f1af1398a24b1f9f992e0080 , < 82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0 (git) Affected: f9010dbdce911ee1f1af1398a24b1f9f992e0080 , < d2be773a92874a070215b51b730cb2b1eaa8fae2 (git) Affected: f9010dbdce911ee1f1af1398a24b1f9f992e0080 , < 7ce635b3d3aba43296b62b5a2d97c008bc51cbd2 (git) Affected: f9010dbdce911ee1f1af1398a24b1f9f992e0080 , < afe16653e05db07d658b55245c7a2e0603f136c0 (git)
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)

Show details on NVD website

JSON

To clipboard

{
  "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": [
            {
              "lessThan": "82a1463c968b1a6ae598a4f2fcef17b71bb7d3a0",
              "status": "affected",
              "version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
              "versionType": "git"
            },
            {
              "lessThan": "d2be773a92874a070215b51b730cb2b1eaa8fae2",
              "status": "affected",
              "version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
              "versionType": "git"
            },
            {
              "lessThan": "7ce635b3d3aba43296b62b5a2d97c008bc51cbd2",
              "status": "affected",
              "version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
              "versionType": "git"
            },
            {
              "lessThan": "afe16653e05db07d658b55245c7a2e0603f136c0",
              "status": "affected",
              "version": "f9010dbdce911ee1f1af1398a24b1f9f992e0080",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/vhost_task.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "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
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.10",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.4",
                  "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."
        }
      ],
      "metrics": [
        {
          "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached only through local device interfaces \u2014 ioctls on /dev/vhost-net, /dev/vhost-vsock or /dev/vhost-scsi, or /dev/kvm VM setup plus KVM_RUN. No remote or adjacent-network peer can reach `vhost_task_create()`/`vhost_task_wake()`.\nAC:L - The attacker controls both sides of the race: it creates the vhost worker via VHOST_SET_OWNER/VHOST_NEW_WORKER (which unconditionally calls `vhost_worker_queue()` \u2192 `vhost_task_wake()` with no `killed` check) and delivers the SIGKILL from a sibling process, and can retry the sequence indefinitely at no cost. Per UAF guidance this is Low.\nPR:L - Only an ordinary local account with access to the vhost misc devices or /dev/kvm is needed \u2014 there is not a single `capable()`/CAP_* check on the vhost ioctl path, and `vhost_dev_check_owner()` merely compares `dev-\u003emm == current-\u003emm`. On typical KVM/virtualization hosts these nodes are group- or world-accessible and QEMU itself runs unprivileged.\nUI:N - The attacker performs every step itself \u2014 open the device, issue the ioctl, send the signal, trigger the wake. No action by any other user or administrator is required.\nS:U - The freed `task_struct` and the code corrupting it both live in the host kernel, so the impact stays within the kernel\u0027s own security authority. This is a standard local privilege-escalation surface, not a guest-to-host or IOMMU boundary crossing.\nC:H - A use-after-free on `task_struct` lets the attacker reclaim the slab object with sprayed content and have the scheduler operate on it, which is readily leveraged into kernel memory disclosure and, once escalated, full read access to all system memory.\nI:H - `wake_up_process()` on the freed task reaches `activate_task()` \u2192 `p-\u003esched_class-\u003eenqueue_task()`, an indirect call through a function pointer read from freed memory, and enqueues attacker-reallocated data onto a runqueue \u2014 a control-flow-hijack and arbitrary-write primitive.\nA:H - Even without successful exploitation, dereferencing and locking a freed `task_struct` inside the scheduler reliably produces a kernel oops/panic or runqueue corruption, taking down the entire host including all VMs it serves."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:07:06.656Z",
        "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": "2026-08-05T12:07:06.656Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2025-40024

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

Tags

Sightings

Nomenclature

Related by attack behaviour