CVE-2021-3682
A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.88%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host.
- CVSS 3.1
- 8.5 HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 2.88% probability · 86th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-763
- Affected
- qemu/qemu · redhat/enterprise linux · debian/debian linux
- Source
- secalert@redhat.com
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1989651Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202208-27Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210902-0006/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4980Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1989651Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202208-27Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210902-0006/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4980Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.