CVE-2025-39951 (GCVE-0-2025-39951)
Vulnerability from cvelistv5
Published
2025-10-04 07:31
Modified
2026-08-05 12:06
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: 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 04e5b1fb01834a602acaae2276b67a783a8c6159
Version: 04e5b1fb01834a602acaae2276b67a783a8c6159
Version: 04e5b1fb01834a602acaae2276b67a783a8c6159
Version: 04e5b1fb01834a602acaae2276b67a783a8c6159
Version: 04e5b1fb01834a602acaae2276b67a783a8c6159
Version: 04e5b1fb01834a602acaae2276b67a783a8c6159
Version: 04e5b1fb01834a602acaae2276b67a783a8c6159
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/um/drivers/virtio_uml.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/um/drivers/virtio_uml.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.245",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.194",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.154",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.9",
              "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": "5.10.245",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.194",
                  "versionStartIncluding": "5.5",
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                  "versionStartIncluding": "5.5",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.5",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.5",
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                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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": {
            "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 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:06:24.628Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/14c231959a16ca41bfdcaede72483362a8c645d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e94e44c9cb30d7a383d8ac227f24a8c9326b770"
        },
        {
          "url": "https://git.kernel.org/stable/c/aaf900a83508c8cd5cdf765e7749f9076196ec7f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f364023ddcfe83f7073b973a9cb98584b7f2a46"
        },
        {
          "url": "https://git.kernel.org/stable/c/00e98b5a69034b251bb36dc6e7123d7648e218e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/c2ff91255e0157b356cff115d8dc3eeb5162edf2"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ebf70cf181651fe3f2e44e95e7e5073d594c9c0"
        }
      ],
      "title": "um: virtio_uml: Fix use-after-free after put_device in probe",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
}


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