ubuntu-cve-2018-12633
Vulnerability from osv_ubuntu
Published
2018-06-22 00:29
Modified
2026-07-04 16:37
Summary
Details
An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.
Severity
6.3 (Medium)
N/A (UNKNOWN)
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"binary_version": "7.2.2-dfsg-2ubuntu0.1"
},
{
"binary_name": "virtualbox-guest-x11-hwe",
"binary_version": "7.2.2-dfsg-2ubuntu0.1"
},
{
"binary_name": "virtualbox-qt",
"binary_version": "7.2.2-dfsg-2ubuntu0.1"
},
{
"binary_name": "virtualbox-source",
"binary_version": "7.2.2-dfsg-2ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "virtualbox",
"purl": "pkg:deb/ubuntu/virtualbox@7.2.2-dfsg-2ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.0.20-dfsg-1.2",
"7.0.26-dfsg-1",
"7.1.8-dfsg-2",
"7.1.8-dfsg-3",
"7.1.8-dfsg-3build1",
"7.1.10-dfsg-1",
"7.1.12-dfsg-1",
"7.1.12-dfsg-2",
"7.2.0-dfsg-2",
"7.2.0-dfsg-3",
"7.2.2-dfsg-2",
"7.2.2-dfsg-2ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "virtualbox",
"binary_version": "7.2.6-dfsg-4"
},
{
"binary_name": "virtualbox-dkms",
"binary_version": "7.2.6-dfsg-4"
},
{
"binary_name": "virtualbox-guest-utils",
"binary_version": "7.2.6-dfsg-4"
},
{
"binary_name": "virtualbox-guest-utils-hwe",
"binary_version": "7.2.6-dfsg-4"
},
{
"binary_name": "virtualbox-guest-x11",
"binary_version": "7.2.6-dfsg-4"
},
{
"binary_name": "virtualbox-guest-x11-hwe",
"binary_version": "7.2.6-dfsg-4"
},
{
"binary_name": "virtualbox-qt",
"binary_version": "7.2.6-dfsg-4"
},
{
"binary_name": "virtualbox-source",
"binary_version": "7.2.6-dfsg-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "virtualbox",
"purl": "pkg:deb/ubuntu/virtualbox@7.2.6-dfsg-4?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.2.2-dfsg-2",
"7.2.2-dfsg-3",
"7.2.4-dfsg-1",
"7.2.4-dfsg-1build1",
"7.2.4-dfsg-2~build1",
"7.2.4-dfsg-3",
"7.2.6-dfsg-3",
"7.2.6-dfsg-3ubuntu1",
"7.2.6-dfsg-3.2",
"7.2.6-dfsg-4"
]
}
],
"aliases": [],
"details": "An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.",
"id": "UBUNTU-CVE-2018-12633",
"modified": "2026-07-04T16:37:54Z",
"published": "2018-06-22T00:29:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2018-12633"
},
{
"type": "REPORT",
"url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba"
},
{
"type": "REPORT",
"url": "https://bugzilla.kernel.org/show_bug.cgi?id=200131"
},
{
"type": "REPORT",
"url": "https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-12633"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2018-12633"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| 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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