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.
References
Link | Resource |
---|---|
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html | Mailing List Third Party Advisory |
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html | Mailing List Third Party Advisory |
https://security.gentoo.org/glsa/202107-30 | Third Party Advisory |
https://security.netapp.com/advisory/ntap-20210205-0001/ | Third Party Advisory |
https://www.debian.org/security/2021/dsa-4843 | Third Party Advisory |
https://xenbits.xenproject.org/xsa/advisory-350.html | Patch Vendor Advisory |
Configurations
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History
No history.
Information
Published : 2020-12-15 17:15
Updated : 2024-02-28 18:08
NVD link : CVE-2020-29569
Mitre link : CVE-2020-29569
CVE.ORG link : CVE-2020-29569
JSON object : View
Products Affected
linux
- linux_kernel
debian
- debian_linux
netapp
- hci_compute_node_bios
- solidfire_\&_hci_storage_node
- solidfire_\&_hci_management_node
- hci_compute_node
xen
- xen
CWE
CWE-416
Use After Free