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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2020-12-15T17:00:36

Updated: 2024-08-04T16:55:10.494Z

Reserved: 2020-12-04T00:00:00

Link: CVE-2020-29569

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2020-12-15T17:15:14.707

Modified: 2024-11-21T05:24:13.443

Link: CVE-2020-29569

cve-icon Redhat

No data.