ubuntu-cve-2021-3782
Vulnerability from osv_ubuntu
Published
2022-08-30 20:51
Modified
2026-04-22 07:39
Summary
Details
An internal reference count is held on the buffer pool, incremented every time a new buffer is created from the pool. The reference count is maintained as an int; on LP64 systems this can cause the reference count to overflow if the client creates a large number of wl_shm buffer objects, or if it can coerce the server to create a large number of external references to the buffer storage. With the reference count overflowing, a use-after-free can be constructed on the wl_shm_pool tracking structure, where values may be incremented or decremented; it may also be possible to construct a limited oracle to leak 4 bytes of server-side memory to the attacking client at a time.
Severity
6.6 (Medium)
6.6 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libwayland-bin",
"binary_version": "1.12.0-1~ubuntu16.04.3+esm1"
},
{
"binary_name": "libwayland-client0",
"binary_version": "1.12.0-1~ubuntu16.04.3+esm1"
},
{
"binary_name": "libwayland-cursor0",
"binary_version": "1.12.0-1~ubuntu16.04.3+esm1"
},
{
"binary_name": "libwayland-server0",
"binary_version": "1.12.0-1~ubuntu16.04.3+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "wayland",
"purl": "pkg:deb/ubuntu/wayland@1.12.0-1~ubuntu16.04.3+esm1?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.12.0-1~ubuntu16.04.3+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.8.1-1",
"1.9.0-1",
"1.12.0-1~ubuntu16.04.1",
"1.12.0-1~ubuntu16.04.2",
"1.12.0-1~ubuntu16.04.3"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libwayland-bin",
"binary_version": "1.16.0-1ubuntu1.1~18.04.4"
},
{
"binary_name": "libwayland-client0",
"binary_version": "1.16.0-1ubuntu1.1~18.04.4"
},
{
"binary_name": "libwayland-cursor0",
"binary_version": "1.16.0-1ubuntu1.1~18.04.4"
},
{
"binary_name": "libwayland-egl1",
"binary_version": "1.16.0-1ubuntu1.1~18.04.4"
},
{
"binary_name": "libwayland-server0",
"binary_version": "1.16.0-1ubuntu1.1~18.04.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "wayland",
"purl": "pkg:deb/ubuntu/wayland@1.16.0-1ubuntu1.1~18.04.4?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.16.0-1ubuntu1.1~18.04.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.14.0-1",
"1.14.0-2",
"1.16.0-1ubuntu1.1~18.04.1",
"1.16.0-1ubuntu1.1~18.04.3"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libwayland-bin",
"binary_version": "1.18.0-1ubuntu0.1"
},
{
"binary_name": "libwayland-client0",
"binary_version": "1.18.0-1ubuntu0.1"
},
{
"binary_name": "libwayland-cursor0",
"binary_version": "1.18.0-1ubuntu0.1"
},
{
"binary_name": "libwayland-egl1",
"binary_version": "1.18.0-1ubuntu0.1"
},
{
"binary_name": "libwayland-server0",
"binary_version": "1.18.0-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "wayland",
"purl": "pkg:deb/ubuntu/wayland@1.18.0-1ubuntu0.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.17.0-1",
"1.17.0-1build1",
"1.17.0-1build2",
"1.18.0-1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libwayland-bin",
"binary_version": "1.20.0-1ubuntu0.1"
},
{
"binary_name": "libwayland-client0",
"binary_version": "1.20.0-1ubuntu0.1"
},
{
"binary_name": "libwayland-cursor0",
"binary_version": "1.20.0-1ubuntu0.1"
},
{
"binary_name": "libwayland-egl1",
"binary_version": "1.20.0-1ubuntu0.1"
},
{
"binary_name": "libwayland-server0",
"binary_version": "1.20.0-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "wayland",
"purl": "pkg:deb/ubuntu/wayland@1.20.0-1ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.20.0-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.19.0-2build1",
"1.20.0-1"
]
}
],
"aliases": [],
"details": "An internal reference count is held on the buffer pool, incremented every time a new buffer is created from the pool. The reference count is maintained as an int; on LP64 systems this can cause the reference count to overflow if the client creates a large number of wl_shm buffer objects, or if it can coerce the server to create a large number of external references to the buffer storage. With the reference count overflowing, a use-after-free can be constructed on the wl_shm_pool tracking structure, where values may be incremented or decremented; it may also be possible to construct a limited oracle to leak 4 bytes of server-side memory to the attacking client at a time.",
"id": "UBUNTU-CVE-2021-3782",
"modified": "2026-04-22T07:39:49Z",
"published": "2022-08-30T20:51:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-3782"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2021-3782"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5614-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5614-2"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3782"
}
],
"related": [
"USN-5614-1",
"USN-5614-2"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-3782"
]
}
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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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