What is the CVSS score of CVE-2020-29569?

CVE-2020-29569 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.4%.

Is there a patch available for CVE-2020-29569?

Yes, a patch is available for CVE-2020-29569. Update the affected software to the latest version immediately.

Debian Linux CVE-2020-29569

HIGH

Use After Free (CWE-416)

2020-12-15 cve@mitre.org

Privilege Escalation Linux Use After Free Memory Corruption Debian Debian Linux Linux Kernel Xen Solidfire Hci Management Node Solidfire Hci Storage Node Hci Compute Node Bios Netapp

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Dec 15, 2020 - 17:15 nvd

HIGH 8.8

DescriptionNVD

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.

AnalysisAI

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. Rated high severity (CVSS 8.8), this vulnerability is low attack complexity. This Use After Free vulnerability could allow attackers to access freed memory to execute arbitrary code or crash the application.

Technical ContextAI

This vulnerability is classified as Use After Free (CWE-416), which allows attackers to access freed memory to execute arbitrary code or crash the application. 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 products include: Xen, Linux Linux Kernel, Netapp Hci Compute Node Bios, Netapp Solidfire \& Hci Management Node, Netapp Solidfire \& Hci Storage Node. Version information: through 5.10.1.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Use smart pointers or garbage-collected languages. Set pointers to NULL after freeing. Enable memory sanitizers.