CVE-2020-29569
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- CVE-2020-29569
CVE Details
| Release Date: | 2020-12-15 |
Description
An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.
See more information about CVE-2020-29569 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: | 8.8 | Base Metrics: | AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| Access Vector: | Local network | Attack Complexity: | Low |
| Privileges Required: | Low | User Interaction: | None |
| Scope: | Changed | Confidentiality Impact: | High |
| Integrity Impact: | High | Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 6 (kernel-uek) | ELSA-2021-9009 | 2021-01-12 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9005 | 2021-01-12 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9006 | 2021-01-12 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9009 | 2021-01-12 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9023 | 2021-01-30 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9037 | 2021-02-08 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9007 | 2021-01-12 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9008 | 2021-01-12 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9024 | 2021-02-01 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9025 | 2021-02-01 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9038 | 2021-02-08 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2021-9006 | 2021-01-12 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2021-9037 | 2021-02-08 |
| Oracle Linux version 8 (kernel-uek-container) | ELSA-2021-9007 | 2021-01-12 |
| Oracle Linux version 8 (kernel-uek-container) | ELSA-2021-9038 | 2021-02-08 |
| Oracle VM version 3.4 (kernel-uek) | OVMSA-2021-0002 | 2021-01-12 |
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