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.
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Affected Vendors & Products
References
History
No history.
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
Vulnrichment
No data.
NVD
Status : Analyzed
Published: 2020-12-15T17:15:14.707
Modified: 2023-01-19T15:53:51.257
Link: CVE-2020-29569
Redhat
No data.