CVE-2021-4145

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Source
https://cve.org/CVERecord?id=CVE-2021-4145
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4145.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-4145
Downstream
Related
Published
2022-01-25T20:15:08Z
Modified
2026-07-09T05:45:10Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0. The self pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node.

Database specific 
{
    "unresolved_ranges":  [
        {
            "cpes":  [
                "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*"
            ],
            "extracted_events":  [
                {
                    "introduced":  "8.0"
                },
                {
                    "last_affected":  "8.0"
                }
            ],
            "source":  "CPE_STRING",
            "vendor_product":  "redhat:enterprise_linux"
        }
    ]
}
References

Affected packages

Git / github.com/qemu/qemu

Affected ranges

Type
GIT
Repo
https://github.com/qemu/qemu
Events
Introduced
f9baca549e44791be0dd98de15add3d8452a8af0
Last Affected
ecf2706e271fa705621f0d5ad9517fe15a22bf22
Database specific
Show details 
{
    "cpe":  [
        "cpe:2.3:a:qemu:qemu:6.1.0:-:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc0:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc1:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc2:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc3:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc4:*:*:*:*:*:*"
    ],
    "extracted_events":  [
        {
            "introduced":  "6.1.0-NA"
        },
        {
            "last_affected":  "6.1.0-NA"
        },
        {
            "introduced":  "6.1.0-rc0"
        },
        {
            "last_affected":  "6.1.0-rc0"
        },
        {
            "introduced":  "6.1.0-rc1"
        },
        {
            "last_affected":  "6.1.0-rc1"
        },
        {
            "introduced":  "6.1.0-rc2"
        },
        {
            "last_affected":  "6.1.0-rc2"
        },
        {
            "introduced":  "6.1.0-rc3"
        },
        {
            "last_affected":  "6.1.0-rc3"
        },
        {
            "introduced":  "6.1.0-rc4"
        },
        {
            "last_affected":  "6.1.0-rc4"
        }
    ],
    "source":  "CPE_STRING"
}

Affected versions

6.*
6.1.0-NA
6.1.0-rc0
6.1.0-rc1
6.1.0-rc2
6.1.0-rc3
6.1.0-rc4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4145.json"

Git / gitlab.com/qemu-project/qemu

Affected ranges

Type
GIT
Repo
https://gitlab.com/qemu-project/qemu
Events
Introduced
f9baca549e44791be0dd98de15add3d8452a8af0
Last Affected
ecf2706e271fa705621f0d5ad9517fe15a22bf22
Fixed
66fed30c9cd11854fc878a4eceb507e915d7c9cd
Database specific
Show details 
{
    "cpe":  [
        "cpe:2.3:a:qemu:qemu:6.1.0:-:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc0:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc1:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc2:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc3:*:*:*:*:*:*",
        "cpe:2.3:a:qemu:qemu:6.1.0:rc4:*:*:*:*:*:*"
    ],
    "extracted_events":  [
        {
            "introduced":  "6.1.0-NA"
        },
        {
            "last_affected":  "6.1.0-NA"
        },
        {
            "introduced":  "6.1.0-rc0"
        },
        {
            "last_affected":  "6.1.0-rc0"
        },
        {
            "introduced":  "6.1.0-rc1"
        },
        {
            "last_affected":  "6.1.0-rc1"
        },
        {
            "introduced":  "6.1.0-rc2"
        },
        {
            "last_affected":  "6.1.0-rc2"
        },
        {
            "introduced":  "6.1.0-rc3"
        },
        {
            "last_affected":  "6.1.0-rc3"
        },
        {
            "introduced":  "6.1.0-rc4"
        },
        {
            "last_affected":  "6.1.0-rc4"
        }
    ],
    "source":  [
        "CPE_STRING",
        "REFERENCES"
    ]
}

Affected versions

6.*
6.1.0-NA
6.1.0-rc0
6.1.0-rc1
6.1.0-rc2
6.1.0-rc3
6.1.0-rc4
v6.*
v6.1.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4145.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "111420676610769034413802176203666229979",
            "length":  765
        },
        "id":  "CVE-2021-4145-0b3d3b8a",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://gitlab.com/qemu-project/qemu@66fed30c9cd11854fc878a4eceb507e915d7c9cd",
        "target":  {
            "file":  "block/mirror.c",
            "function":  "mirror_wait_on_conflicts"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "318922015838556192816489864438945311255",
                "207883243228566117996208701354740977517",
                "129441833247124108893163559685468156379",
                "271930729929995938552906080710242646107",
                "123116646464447836744365593482046772520",
                "10151430632489040759507122959361894067",
                "237221403894624056460302060588217687577",
                "35068563641036379331739204802122430715",
                "225885450527325332969300107213632380174"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2021-4145-73199ac7",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://gitlab.com/qemu-project/qemu@66fed30c9cd11854fc878a4eceb507e915d7c9cd",
        "target":  {
            "file":  "block/mirror.c"
        }
    }
]
vanir_signatures_modified 
"2026-07-09T05:45:10Z"