CVE-2021-3527
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-3527
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-3527.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-3527
- Downstream
- Related
- Published
- 2021-05-26T22:15:08Z
- Modified
- 2025-09-19T13:04:56.148955Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.
- References
-
- https://bugzilla.redhat.com/show_bug.cgi?id=1955695
- https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c
- https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986
- https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- https://security.gentoo.org/glsa/202208-27
- https://security.netapp.com/advisory/ntap-20210708-0008/
- https://www.openwall.com/lists/oss-security/2021/05/05/5
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 affectedLast affected
- Type
- GIT
- Repo
- https://gitlab.com/qemu-project/qemu
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
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
Database specific
{
"vanir_signatures": [
{
"digest": {
"threshold": 0.9,
"line_hashes": [
"269400761726207554090353202840902315257",
"119307344340641259751801519692907203016",
"326548559512027486046572904986022376072",
"73041713572673512055747119237799287705"
]
},
"target": {
"file": "hw/usb/combined-packet.c"
},
"source": "https://gitlab.com/qemu-project/qemu@05a40b172e4d691371534828078be47e7fff524c",
"id": "CVE-2021-3527-4cab5e44",
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"digest": {
"threshold": 0.9,
"line_hashes": [
"167443947742219700222957101252243774600",
"61911157104635718831387678215906986250",
"29568767801218084532825511420516210099",
"88460353428432787954060144963198367115",
"293827903315787450183182877461871256600",
"90873833699346552304369370712175299809",
"37900396691202462739205124391483260441",
"242002003889685031535552614557524308098",
"51051223527711322627583931772797510787",
"210975785683925942205039452318950435298",
"108317851574551643512430908095355764785",
"83811626812010732757727657331821254659"
]
},
"target": {
"file": "hw/usb/redirect.c"
},
"source": "https://gitlab.com/qemu-project/qemu@7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986",
"id": "CVE-2021-3527-503e3bf1",
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"digest": {
"function_hash": "193074547064934338397412369714946632047",
"length": 3283.0
},
"target": {
"file": "hw/usb/redirect.c",
"function": "usbredir_handle_iso_data"
},
"source": "https://gitlab.com/qemu-project/qemu@7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986",
"id": "CVE-2021-3527-7596b36c",
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"digest": {
"function_hash": "166676994960784205671750699193853905376",
"length": 523.0
},
"target": {
"file": "hw/usb/redirect.c",
"function": "usbredir_handle_interrupt_out_data"
},
"source": "https://gitlab.com/qemu-project/qemu@7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986",
"id": "CVE-2021-3527-adb2a197",
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"digest": {
"function_hash": "249538098380142255455224067407001734942",
"length": 1311.0
},
"target": {
"file": "hw/usb/combined-packet.c",
"function": "usb_ep_combine_input_packets"
},
"source": "https://gitlab.com/qemu-project/qemu@05a40b172e4d691371534828078be47e7fff524c",
"id": "CVE-2021-3527-b2c39117",
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"digest": {
"function_hash": "198368438371595159633120831886524687622",
"length": 1398.0
},
"target": {
"file": "hw/usb/redirect.c",
"function": "usbredir_handle_bulk_data"
},
"source": "https://gitlab.com/qemu-project/qemu@7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986",
"id": "CVE-2021-3527-d8d1898b",
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
]
}