CVE-2021-3527
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- CVE-2021-3527
CVE Details
| Release Date: | 2021-05-26 |
Description
A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.
See more information about CVE-2021-3527 from MITRE CVE dictionary and NIST NVD
CVSS v3.0 metrics
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
| Base Score: | 5.5 | Base Metrics: | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Access Vector: | Local network | Attack Complexity: | Low |
| Privileges Required: | Low | User Interaction: | None |
| Scope: | Unchanged | Confidentiality Impact: | None |
| Integrity Impact: | None | Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 7 (qemu) | ELSA-2021-9425 | 2021-08-17 |
| Oracle Linux version 8 (hivex) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (libguestfs) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (libguestfs-winsupport) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (libiscsi) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (libnbd) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (libvirt) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (libvirt-dbus) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (libvirt-python) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (nbdkit) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (netcf) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (perl-Sys-Virt) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (qemu-kvm) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (seabios) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (sgabios) | ELSA-2021-9568 | 2021-12-01 |
| Oracle Linux version 8 (supermin) | ELSA-2021-9568 | 2021-12-01 |
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