Vulnerability-Lookup

GHSA-9FVG-5X6H-M5X2

Vulnerability from github – Published: 2025-10-04 09:30 – Updated: 2026-01-23 21:30

Details

In the Linux kernel, the following vulnerability has been resolved:

um: virtio_uml: Fix use-after-free after put_device in probe

When register_virtio_device() fails in virtio_uml_probe(), the code sets vu_dev->registered = 1 even though the device was not successfully registered. This can lead to use-after-free or other issues.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39951"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-04T08:15:48Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\num: virtio_uml: Fix use-after-free after put_device in probe\n\nWhen register_virtio_device() fails in virtio_uml_probe(),\nthe code sets vu_dev-\u003eregistered = 1 even though\nthe device was not successfully registered.\nThis can lead to use-after-free or other issues.",
  "id": "GHSA-9fvg-5x6h-m5x2",
  "modified": "2026-01-23T21:30:36Z",
  "published": "2025-10-04T09:30:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39951"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00e98b5a69034b251bb36dc6e7123d7648e218e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/14c231959a16ca41bfdcaede72483362a8c645d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f364023ddcfe83f7073b973a9cb98584b7f2a46"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e94e44c9cb30d7a383d8ac227f24a8c9326b770"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ebf70cf181651fe3f2e44e95e7e5073d594c9c0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aaf900a83508c8cd5cdf765e7749f9076196ec7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2ff91255e0157b356cff115d8dc3eeb5162edf2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-39951 (GCVE-0-2025-39951)

Vulnerability from cvelistv5 – Published: 2025-10-04 07:31 – Updated: 2026-08-05 12:06

Title

um: virtio_uml: Fix use-after-free after put_device in probe

Summary

In the Linux kernel, the following vulnerability has been resolved: um: virtio_uml: Fix use-after-free after put_device in probe When register_virtio_device() fails in virtio_uml_probe(), the code sets vu_dev->registered = 1 even though the device was not successfully registered. This can lead to use-after-free or other issues.

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 CNA under the mitre root

CNA scorecard D 53/100 over 6794 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/14c231959a16ca41b…
https://git.kernel.org/stable/c/5e94e44c9cb30d7a3…
https://git.kernel.org/stable/c/aaf900a83508c8cd5…
https://git.kernel.org/stable/c/4f364023ddcfe83f7…
https://git.kernel.org/stable/c/00e98b5a69034b251…
https://git.kernel.org/stable/c/c2ff91255e0157b35…
https://git.kernel.org/stable/c/7ebf70cf181651fe3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 04e5b1fb01834a602acaae2276b67a783a8c6159 , < 14c231959a16ca41bfdcaede72483362a8c645d7 (git) Affected: 04e5b1fb01834a602acaae2276b67a783a8c6159 , < 5e94e44c9cb30d7a383d8ac227f24a8c9326b770 (git) Affected: 04e5b1fb01834a602acaae2276b67a783a8c6159 , < aaf900a83508c8cd5cdf765e7749f9076196ec7f (git) Affected: 04e5b1fb01834a602acaae2276b67a783a8c6159 , < 4f364023ddcfe83f7073b973a9cb98584b7f2a46 (git) Affected: 04e5b1fb01834a602acaae2276b67a783a8c6159 , < 00e98b5a69034b251bb36dc6e7123d7648e218e4 (git) Affected: 04e5b1fb01834a602acaae2276b67a783a8c6159 , < c2ff91255e0157b356cff115d8dc3eeb5162edf2 (git) Affected: 04e5b1fb01834a602acaae2276b67a783a8c6159 , < 7ebf70cf181651fe3f2e44e95e7e5073d594c9c0 (git)
Linux	Linux	Affected: 5.5 Unaffected: 0 , < 5.5 (semver) Unaffected: 5.10.245 , ≤ 5.10.* (semver) Unaffected: 5.15.194 , ≤ 5.15.* (semver) Unaffected: 6.1.154 , ≤ 6.1.* (semver) Unaffected: 6.6.108 , ≤ 6.6.* (semver) Unaffected: 6.12.49 , ≤ 6.12.* (semver) Unaffected: 6.16.9 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/um/drivers/virtio_uml.c"
          ],
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          "vendor": "Linux",
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              "version": "5.5"
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\num: virtio_uml: Fix use-after-free after put_device in probe\n\nWhen register_virtio_device() fails in virtio_uml_probe(),\nthe code sets vu_dev-\u003eregistered = 1 even though\nthe device was not successfully registered.\nThis can lead to use-after-free or other issues."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "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 a UML platform/virtio driver probe path reached through local device configuration (kernel command line, devicetree, mconsole, or sysfs driver bind), not through any remote protocol; the vhost-user peer is a local UNIX socket. No network-supplied data influences the failing call.\nAC:L - The `register_virtio_device()` failure can be produced deterministically via the OF path (`virtio_device_of_init()` returns -EINVAL when the parent node has more than one available child) and can also be induced by attacker-driven memory pressure on the `ida_alloc`/`dev_set_name`/`device_add` allocations; no condition outside the attacker\u0027s influence must hold.\nPR:L - A local unprivileged account on the UML instance suffices to drive the allocation-failure condition that makes the probe fail, and the resulting write-after-free happens with no further authorization check; no capability is validated in `virtio_uml_probe()` itself.\nUI:N - The faulty path executes automatically during driver probe/bind; nothing requires a victim to open a file, mount a filesystem, or otherwise interact.\nS:U - The corrupted memory and the vulnerable code are both in the kernel\u0027s own heap and security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The use-after-free leaves a freed `struct virtio_uml_device` (and a dangling `platform_set_drvdata` pointer) in play; an attacker who reclaims the slab slot with a chosen object gains a read primitive over kernel memory contents.\nI:H - The code performs an out-of-lifetime read-modify-write into the freed object, so heap grooming lets an attacker corrupt an unrelated reclaimed kernel structure, which is exploitable toward arbitrary write and control-flow hijack.\nA:H - Writing into freed slab memory corrupts allocator state and adjacent live objects, reliably producing kernel oops/panic (and KASAN slab-use-after-free splats) that take down the kernel instance."
            }
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          "url": "https://git.kernel.org/stable/c/7ebf70cf181651fe3f2e44e95e7e5073d594c9c0"
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      "title": "um: virtio_uml: Fix use-after-free after put_device in probe",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39951",
    "datePublished": "2025-10-04T07:31:11.684Z",
    "dateReserved": "2025-04-16T07:20:57.148Z",
    "dateUpdated": "2026-08-05T12:06:24.628Z",
    "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.

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