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Vulnerability CVE-2020-29569
Published: 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. |
Type:
CWE-252 (Unchecked Return Value)
CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Base Score |
Impact Subscore |
Exploitability Subscore |
7.2/10 |
10/10 |
3.9/10 |
Exploit range |
Attack complexity |
Authentication |
Local |
Low |
No required |
Confidentiality impact |
Integrity impact |
Availability impact |
Complete |
Complete |
Complete |
References: |
https://xenbits.xenproject.org/xsa/advisory-350.html
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