CVE-2021-4145 is a NULL pointer dereference vulnerability affecting QEMU versions prior to 6.2.0, as well as Red Hat Enterprise Linux and QEMU products. An unprivileged guest user can exploit this flaw to crash the host's QEMU process by triggering a specific condition during data mirroring. This vulnerability has a CVSS score of 6.5 (Medium), indicating a local attack vector with low complexity, resulting in high availability impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
6.1.0CPE matchmatch criteria | cpe:2.3:a:qemu:qemu:6.1.0:-:*:*:*:*:*:* | ||
6.1.0CPE matchmatch criteria | cpe:2.3:a:qemu:qemu:6.1.0:rc0:*:*:*:*:*:* | ||
6.1.0CPE matchmatch criteria | cpe:2.3:a:qemu:qemu:6.1.0:rc1:*:*:*:*:*:* | ||
6.1.0CPE matchmatch criteria | cpe:2.3:a:qemu:qemu:6.1.0:rc2:*:*:*:*:*:* | ||
6.1.0CPE matchmatch criteria | cpe:2.3:a:qemu:qemu:6.1.0:rc3:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
CVE-2021-4145
Mar 14, 2023A 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.
Jan 11, 2022QEMU: NULL pointer dereference in mirror_wait_on_conflicts() in block/mirror.c
Dec 10, 2021