CVE-2020-29569HIGH
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.
References
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
https://security.netapp.com/advisory/ntap-20210205-0001/
Details
Source: MITRE
Published: 2020-12-15
Updated: 2021-03-15
Type: CWE-252
Risk Information
CVSS v2.0
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
CVSS v3.0
Base Score: 8.8
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Impact Score: 6
Exploitability Score: 2
Severity: HIGH
Vulnerable Software
Configuration 1
OR
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* versions up to 4.14.1 (inclusive)
Configuration 2
OR
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to 5.10.1 (inclusive)
Configuration 3
AND
OR
OR
Configuration 4
OR
cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:solidfire_\&_hci_storage_node:-:*:*:*:*:*:*:*
Configuration 5
OR
Tenable Plugins
| ID | Name | Product | Family | Severity |
|---|---|---|---|---|
| 148009 | Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4750-1) | Nessus | Ubuntu Local Security Checks | high |
| 148001 | Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4876-1) | Nessus | Ubuntu Local Security Checks | high |
| 147983 | Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4749-1) | Nessus | Ubuntu Local Security Checks | high |
| 147978 | Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4751-1) | Nessus | Ubuntu Local Security Checks | high |
| 147532 | Debian DLA-2586-1 : linux security update | Nessus | Debian Local Security Checks | high |
| 146685 | SUSE SLES15 Security Update : kernel (SUSE-SU-2021:0532-1) | Nessus | SuSE Local Security Checks | high |
| 146512 | Debian DLA-2557-1 : linux-4.19 security update | Nessus | Debian Local Security Checks | high |
| 146511 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0452-1) | Nessus | SuSE Local Security Checks | high |
| 146476 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0437-1) | Nessus | SuSE Local Security Checks | high |
| 146474 | SUSE SLES15 Security Update : kernel (SUSE-SU-2021:0438-1) | Nessus | SuSE Local Security Checks | high |
| 146470 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0434-1) | Nessus | SuSE Local Security Checks | high |
| 146406 | SUSE SLES15 Security Update : kernel (SUSE-SU-2021:0427-1) | Nessus | SuSE Local Security Checks | high |
| 146401 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0408-1) | Nessus | SuSE Local Security Checks | high |
| 146366 | SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:0354-1) | Nessus | SuSE Local Security Checks | high |
| 146362 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0348-1) | Nessus | SuSE Local Security Checks | high |
| 146359 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:0353-1) | Nessus | SuSE Local Security Checks | high |
| 146293 | openSUSE Security Update : the Linux Kernel (openSUSE-2021-241) | Nessus | SuSE Local Security Checks | high |
| 146217 | EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1246) | Nessus | Huawei Local Security Checks | high |
| 146052 | Debian DSA-4843-1 : linux - security update | Nessus | Debian Local Security Checks | high |
| 146047 | Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9025) | Nessus | Oracle Linux Local Security Checks | high |
| 146045 | Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9024) | Nessus | Oracle Linux Local Security Checks | high |
| 145700 | Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9023) | Nessus | Oracle Linux Local Security Checks | high |
| 145458 | Amazon Linux AMI : kernel (ALAS-2021-1477) | Nessus | Amazon Linux Local Security Checks | high |
| 145456 | Amazon Linux 2 : kernel (ALAS-2021-1588) | Nessus | Amazon Linux Local Security Checks | high |
| 145287 | openSUSE Security Update : the Linux Kernel (openSUSE-2021-75) | Nessus | SuSE Local Security Checks | high |
| 144907 | Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9006) | Nessus | Oracle Linux Local Security Checks | high |
| 144906 | Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9007) | Nessus | Oracle Linux Local Security Checks | high |
| 144905 | Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2021-9009) | Nessus | Oracle Linux Local Security Checks | high |
| 144904 | Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9005) | Nessus | Oracle Linux Local Security Checks | high |
| 144903 | Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9008) | Nessus | Oracle Linux Local Security Checks | high |
| 144902 | Photon OS 3.0: Linux PHSA-2021-3.0-0182 | Nessus | PhotonOS Local Security Checks | high |
| 144898 | Photon OS 2.0: Linux PHSA-2021-2.0-0310 | Nessus | PhotonOS Local Security Checks | high |