CVE-2021-3748
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-3748
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-3748.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-3748
- Downstream
- Related
- Published
- 2022-03-23T20:15:09Z
- Modified
- 2025-09-19T13:09:44.820757Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.
- References
-
- https://bugzilla.redhat.com/show_bug.cgi?id=1998514
- https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6
- https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html
- https://security.gentoo.org/glsa/202208-27
- https://security.netapp.com/advisory/ntap-20220425-0004/
- https://ubuntu.com/security/CVE-2021-3748
Affected packages
Git / github.com/qemu/qemu
Affected ranges
- Type
- GIT
- Repo
- https://github.com/qemu/qemu
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Type
- GIT
- Repo
- https://gitlab.com/qemu-project/qemu
- Events
Affected versions
v0.*
v0.1.0
v0.1.1
v0.1.3
v0.1.4
v0.1.5
v0.1.6
v0.11.0-rc0
v0.12.0-rc0
v0.13.0-rc0
v0.14.0-rc0
v0.15.0-rc0
v0.2.0
v0.3.0
v0.4.0
v0.4.1
v0.4.2
v0.4.3
v0.4.4
v0.5.0
v1.*
v1.0
v1.0-rc0
v1.0-rc1
v1.0-rc2
v1.0-rc3
v1.0-rc4
v1.1-rc0
v1.1-rc1
v1.1-rc2
v1.1.0
v1.1.0-rc2
v1.1.0-rc3
v1.1.0-rc4
v1.2.0
v1.2.0-rc0
v1.2.0-rc1
v1.2.0-rc2
v1.2.0-rc3
v1.3.0
v1.3.0-rc0
v1.3.0-rc1
v1.3.0-rc2
v1.4.0
v1.4.0-rc0
v1.4.0-rc1
v1.4.0-rc2
v1.5.0
v1.5.0-rc0
v1.5.0-rc1
v1.5.0-rc2
v1.5.0-rc3
v1.6.0
v1.6.0-rc0
v1.6.0-rc1
v1.6.0-rc2
v1.6.0-rc3
v1.7.0
v1.7.0-rc0
v1.7.0-rc1
v1.7.0-rc2
v2.*
v2.0.0
v2.0.0-rc0
v2.0.0-rc1
v2.0.0-rc2
v2.0.0-rc3
v2.1.0
v2.1.0-rc0
v2.1.0-rc1
v2.1.0-rc2
v2.1.0-rc3
v2.1.0-rc4
v2.1.0-rc5
v2.10.0
v2.10.0-rc0
v2.10.0-rc1
v2.10.0-rc2
v2.10.0-rc3
v2.10.0-rc4
v2.11.0
v2.11.0-rc0
v2.11.0-rc1
v2.11.0-rc2
v2.11.0-rc3
v2.11.0-rc4
v2.11.0-rc5
v2.12.0
v2.12.0-rc0
v2.12.0-rc1
v2.12.0-rc2
v2.12.0-rc3
v2.12.0-rc4
v2.2.0
v2.2.0-rc0
v2.2.0-rc1
v2.2.0-rc2
v2.2.0-rc3
v2.2.0-rc4
v2.2.0-rc5
v2.3.0
v2.3.0-rc0
v2.3.0-rc1
v2.3.0-rc2
v2.3.0-rc3
v2.3.0-rc4
v2.4.0
v2.4.0-rc0
v2.4.0-rc1
v2.4.0-rc2
v2.4.0-rc3
v2.4.0-rc4
v2.5.0
v2.5.0-rc0
v2.5.0-rc1
v2.5.0-rc2
v2.5.0-rc3
v2.5.0-rc4
v2.6.0
v2.6.0-rc0
v2.6.0-rc1
v2.6.0-rc2
v2.6.0-rc3
v2.6.0-rc4
v2.6.0-rc5
v2.7.0
v2.7.0-rc0
v2.7.0-rc1
v2.7.0-rc2
v2.7.0-rc3
v2.7.0-rc4
v2.7.0-rc5
v2.8.0
v2.8.0-rc0
v2.8.0-rc1
v2.8.0-rc2
v2.8.0-rc3
v2.8.0-rc4
v2.9.0
v2.9.0-rc0
v2.9.0-rc1
v2.9.0-rc2
v2.9.0-rc3
v2.9.0-rc4
v2.9.0-rc5
v3.*
v3.0.0
v3.0.0-rc0
v3.0.0-rc1
v3.0.0-rc2
v3.0.0-rc3
v3.0.0-rc4
v3.1.0
v3.1.0-rc0
v3.1.0-rc1
v3.1.0-rc2
v3.1.0-rc3
v3.1.0-rc4
v3.1.0-rc5
v4.*
v4.0.0
v4.0.0-rc0
v4.0.0-rc1
v4.0.0-rc2
v4.0.0-rc3
v4.0.0-rc4
v4.1.0
v4.1.0-rc0
v4.1.0-rc1
v4.1.0-rc2
v4.1.0-rc3
v4.1.0-rc4
v4.1.0-rc5
v4.2.0
v4.2.0-rc0
v4.2.0-rc1
v4.2.0-rc2
v4.2.0-rc3
v4.2.0-rc4
v4.2.0-rc5
v5.*
v5.0.0
v5.0.0-rc0
v5.0.0-rc1
v5.0.0-rc2
v5.0.0-rc3
v5.0.0-rc4
v5.1.0
v5.1.0-rc0
v5.1.0-rc1
v5.1.0-rc2
v5.1.0-rc3
v5.2.0
v5.2.0-rc0
v5.2.0-rc1
v5.2.0-rc2
v5.2.0-rc3
v5.2.0-rc4
v6.*
v6.0.0
v6.0.0-rc0
v6.0.0-rc1
v6.0.0-rc2
v6.0.0-rc3
v6.0.0-rc4
v6.0.0-rc5
v6.1.0
v6.1.0-rc0
v6.1.0-rc1
v6.1.0-rc2
v6.1.0-rc3
v6.1.0-rc4
Database specific
{
"vanir_signatures": [
{
"deprecated": false,
"target": {
"file": "hw/net/virtio-net.c",
"function": "virtio_net_receive_rcu"
},
"signature_version": "v1",
"id": "CVE-2021-3748-63a59022",
"signature_type": "Function",
"digest": {
"length": 2573.0,
"function_hash": "14770436477810317024841570451115134811"
},
"source": "https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6"
},
{
"deprecated": false,
"target": {
"file": "hw/net/virtio-net.c"
},
"signature_version": "v1",
"id": "CVE-2021-3748-b289847e",
"signature_type": "Line",
"digest": {
"threshold": 0.9,
"line_hashes": [
"139153011538441137443425885686769242333",
"19540242830036793152453911828632731321",
"261971490103105366185518487713065779809",
"274886746361350886814583306928039415769",
"117959129944310761007430404673458701437",
"5575847093833653024836064788740198304",
"164237186261067155017967658108932275749",
"41568830874794595423836708667899720764",
"204979634018619945530189025481137025000",
"200236562904088385766774625108108467906",
"81898909521356078802753323202918312736",
"276622600102277512342777352275962185101",
"17686686804455707955864788085310989909",
"170904657820958641358685323667703360232",
"20732383499291189554247390592397864623",
"104773052961933199236430616329051629652",
"30148309516638926374883201050847486195",
"263405443713322288624440308518443648446",
"43538856978998950359608723105896316473",
"135835704044671834425133687155795544491",
"53527990305242486942412336048341160685",
"298719444517055338988398675801988708732",
"162604734227819747815593254388199626104",
"202154863577782391529005710899301295034",
"102630445816527384348936569443744793486",
"107375714520255535024167627018508704968",
"337770536592677363347602484056375594828",
"329754777237505547929585834740495934718",
"309636159462361027173374396889853120124",
"172880516596470903830738622624501085703",
"112643539357749891484797476986660340522",
"259192748648542531221030014246801045362"
]
},
"source": "https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6"
}
]
}