high
8.8
CWE
416
Advisory Published
Updated

CVE-2020-29569: Use After Free

First published: Tue Dec 15 2020(Updated: )

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.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Xen xen-unstable<=4.14.1
Linux Kernel>=4.1.44<4.2
Linux Kernel>=4.4.80<4.4.254
Linux Kernel>=4.9.36<4.9.249
Linux Kernel>=4.11.9<4.12
Linux Kernel>=4.12<4.14.213
Linux Kernel>=4.15<4.19.164
Linux Kernel>=4.20<5.4.86
Linux Kernel>=5.5<5.10.4
All of
NetApp HCI Compute Node BIOS
netapp hci compute node
netapp solidfire \& hci management node
netapp solidfire \& hci storage node
Debian GNU/Linux=9.0
Debian GNU/Linux=10.0
NetApp HCI Compute Node BIOS
netapp hci compute node
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1

Remedy

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

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2020-29569?

    The severity of CVE-2020-29569 is classified as moderate to high, depending on the specific environment and configuration.

  • How do I fix CVE-2020-29569?

    To fix CVE-2020-29569, upgrade the affected package to version 5.10.223-1 or higher.

  • Which systems are affected by CVE-2020-29569?

    CVE-2020-29569 affects specific versions of the Linux kernel from 4.1.44 up to 5.10.1, along with certain Xen releases.

  • What happens if CVE-2020-29569 is exploited?

    Exploitation of CVE-2020-29569 could lead to a denial of service or potential information leakage in the affected systems.

  • Is there a workaround for CVE-2020-29569?

    As an interim workaround for CVE-2020-29569, it is suggested to restrict the use of vulnerable versions until an update can be applied.

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