Vulnerability Monitor

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CVE-2020-29569

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.

Published

2020-12-15T17:15:14.707

Last Modified

2024-11-21T05:24:13.443

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.8 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

  • Access Vector: LOCAL
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

3.9

Impact Score

10.0

Weaknesses
  • Type: Primary
    CWE-416
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System xen xen ≤ 4.14.1 Yes
Operating System linux linux_kernel < 4.2 Yes
Operating System linux linux_kernel < 4.4.254 Yes
Operating System linux linux_kernel < 4.9.249 Yes
Operating System linux linux_kernel < 4.12 Yes
Operating System linux linux_kernel < 4.14.213 Yes
Operating System linux linux_kernel < 4.19.164 Yes
Operating System linux linux_kernel < 5.4.86 Yes
Operating System linux linux_kernel < 5.10.4 Yes
Operating System netapp hci_compute_node_bios - Yes
Hardware netapp hci_compute_node - No
Application netapp solidfire_\&_hci_management_node - Yes
Application netapp solidfire_\&_hci_storage_node - Yes
Operating System debian debian_linux 9.0 Yes
Operating System debian debian_linux 10.0 Yes
References