QEMU up to 6.1.x Block Mirror Layer mirror_wait_on_conflicts null pointer dereference
|CVSS Meta Temp Score|
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|Current Exploit Price (≈)|
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|CTI Interest Score|
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A vulnerability, which was classified as problematic, has been found in QEMU up to 6.1.x (Virtualization Software). This issue affects the function
mirror_wait_on_conflicts of the component Block Mirror Layer. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-476. Impacted is availability. The summary by CVE is:
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.
The weakness was shared 01/26/2022. It is possible to read the advisory at bugzilla.redhat.com. The identification of this vulnerability is CVE-2021-4145 since 12/21/2021. The attack needs to approached within the local network. The successful exploitation requires a simple authentication. Technical details of the vulnerability are known, but there is no available exploit.
Upgrading to version 6.2.0 eliminates this vulnerability.
CVSSv3VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4
VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
ExploitingClass: Denial of service
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒
Threat IntelligenceInterest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍
0-Day Time: 🔒
Upgrade: QEMU 6.2.0
Timeline12/21/2021 CVE reserved
01/26/2022 +36 days Advisory disclosed
01/26/2022 +0 days VulDB entry created
01/28/2022 +2 days VulDB last update
CVE: CVE-2021-4145 (🔒)
EntryCreated: 01/26/2022 09:51 AM
Updated: 01/28/2022 06:48 PM
Changes: (1) source_cve_nvd_summary
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