CVE-2021-4145 — NULL Pointer Dereference in Qemu
Severity
6.5MEDIUMNVD
EPSS
0.1%
top 82.00%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJan 25
Latest updateJan 26
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:HExploitability: 2.0 | Impact: 4.0
Patches
🔴Vulnerability Details
3GHSA▶
GHSA-j9qg-fc9x-6r3r: A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6↗2022-01-26
OSV▶
CVE-2021-4145: A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6↗2022-01-25
CVEList▶
CVE-2021-4145: A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6↗2022-01-25
📋Vendor Advisories
3Microsoft▶
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↗2022-01-11
Debian▶
CVE-2021-4145: qemu - A NULL pointer dereference issue was found in the block mirror layer of QEMU in ...↗2021