VulnerabilityModified
CVE-2021-3748
A use-after-free vulnerability was found in the virtio-net device of QEMU.
HIGH 7.5EPSS 0.52%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 0.52% probability · 43th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- qemu/qemu · debian/debian linux · canonical/ubuntu linux · fedoraproject/fedora · redhat/enterprise linux · redhat/enterprise linux advanced virtualization eus
- Source
- secalert@redhat.com
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1998514Issue Tracking, Patch, Third Party Advisory
- https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.htmlMailing List, Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202208-27Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220425-0004/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3748Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1998514Issue Tracking, Patch, Third Party Advisory
- https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.htmlMailing List, Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202208-27Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220425-0004/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3748Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.