CVE-2020-29569

HIGH

8.8

CVSS Score

Published: December 15, 2020 at 05:00 PM UTC

Updated: June 17, 2026 at 03:11 AM UTC

7 products affected across 4 vendorsLinux KernelDebian LinuxXen

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Severity

HIGH8.8

Exploit prediction

EPSS 0.4%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

10.0 9.0

Linux Kernel · Linux

95%

4.1.44 ≤ v < 4.24.11.9 ≤ v < 4.124.12 ≤ v < 4.14.2134.15 ≤ v < 4.19.1644.20 ≤ v < 5.4.864.4.80 ≤ v < 4.4.2544.9.36 ≤ v < 4.9.2495.5 ≤ v < 5.10.4

Affected range stops below 4.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.14.213, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.19.164, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.4.254, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.9.249, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.10.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.4.86, so it looks safe — our inference, not a vendor statement

Hci Compute Node BIOS · NetApp

95%

All versions

netapp-hci-compute-node (same device)

Solidfire & Hci Management Node · NetApp

95%

All versions

Solidfire & Hci Storage Node · NetApp

95%

All versions

Xen · Xenwordpress-plugin

95%

v ≤ 4.14.1

Hci Compute Node · NetAppdevice

80%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (6)

Mailing Listx_refsource_MLISTThird Party Advisory

Source: [email protected]

https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html

Mailing Listx_refsource_MLISTThird Party Advisory

Source: [email protected]

https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html

Vendor Advisoryx_refsource_GENTOOThird Party Advisory

Source: [email protected]

https://security.gentoo.org/glsa/202107-30

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://security.netapp.com/advisory/ntap-20210205-0001/

Vendor Advisoryx_refsource_DEBIANThird Party Advisory

Source: [email protected]

https://www.debian.org/security/2021/dsa-4843

x_refsource_MISCPatchVendor Advisory

Source: [email protected]

https://xenbits.xenproject.org/xsa/advisory-350.html

CVSS

8.8HIGH[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: CHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-416

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