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vuln-cve/data/2025/39xxx/CVE-2025-39951.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-39951",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T07:20:57.148Z",
"datePublished": "2025-10-04T07:31:11.684Z",
"dateUpdated": "2026-08-05T12:06:24.628Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:06:24.628Z"
},
"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->registered = 1 even though\nthe device was not successfully registered.\nThis can lead to use-after-free or other issues."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"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's 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's 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."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/um/drivers/virtio_uml.c"
],
"versions": [
{
"version": "04e5b1fb01834a602acaae2276b67a783a8c6159",
"lessThan": "14c231959a16ca41bfdcaede72483362a8c645d7",
"status": "affected",
"versionType": "git"
},
{
"version": "04e5b1fb01834a602acaae2276b67a783a8c6159",
"lessThan": "5e94e44c9cb30d7a383d8ac227f24a8c9326b770",
"status": "affected",
"versionType": "git"
},
{
"version": "04e5b1fb01834a602acaae2276b67a783a8c6159",
"lessThan": "aaf900a83508c8cd5cdf765e7749f9076196ec7f",
"status": "affected",
"versionType": "git"
},
{
"version": "04e5b1fb01834a602acaae2276b67a783a8c6159",
"lessThan": "4f364023ddcfe83f7073b973a9cb98584b7f2a46",
"status": "affected",
"versionType": "git"
},
{
"version": "04e5b1fb01834a602acaae2276b67a783a8c6159",
"lessThan": "00e98b5a69034b251bb36dc6e7123d7648e218e4",
"status": "affected",
"versionType": "git"
},
{
"version": "04e5b1fb01834a602acaae2276b67a783a8c6159",
"lessThan": "c2ff91255e0157b356cff115d8dc3eeb5162edf2",
"status": "affected",
"versionType": "git"
},
{
"version": "04e5b1fb01834a602acaae2276b67a783a8c6159",
"lessThan": "7ebf70cf181651fe3f2e44e95e7e5073d594c9c0",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/um/drivers/virtio_uml.c"
],
"versions": [
{
"version": "5.5",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.5",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.245",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.194",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.154",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.108",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.49",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.16.9",
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "5.10.245"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "5.15.194"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "6.1.154"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "6.6.108"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "6.12.49"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "6.16.9"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "6.17"
}
]
}
]
}
],
"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"
}
}
}
}
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