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 cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xen Xen | <=4.14.1 | |
| Linux Linux kernel | >=4.1.44<4.2 | |
| Linux Linux kernel | >=4.4.80<4.4.254 | |
| Linux Linux kernel | >=4.9.36<4.9.249 | |
| Linux Linux kernel | >=4.11.9<4.12 | |
| Linux Linux kernel | >=4.12<4.14.213 | |
| Linux Linux kernel | >=4.15<4.19.164 | |
| Linux Linux kernel | >=4.20<5.4.86 | |
| Linux 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 Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Netapp Hci Compute Node Bios | ||
| Netapp Hci Compute Node | ||
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1 |
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Reference Links
- https://xenbits.xenproject.org/xsa/advisory-350.html
- https://www.debian.org/security/2021/dsa-4843
- https://security.netapp.com/advisory/ntap-20210205-0001/
- https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://security.gentoo.org/glsa/202107-30
- https://launchpad.net/bugs/cve/CVE-2020-29569
- https://xenbits.xen.org/xsa/advisory-350.html
- https://security-tracker.debian.org/tracker/CVE-2020-29569
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29569
- https://nvd.nist.gov/vuln/detail/CVE-2020-29569
- https://ubuntu.com/security/CVE-2020-29569
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- vendor/xen
- canonical/xen xen
- version/xen xen/4.14.1
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/4.1.44
- version/linux linux kernel/4.4.80
- version/linux linux kernel/4.9.36
- version/linux linux kernel/4.11.9
- version/linux linux kernel/4.12
- version/linux linux kernel/4.15
- version/linux linux kernel/4.20
- version/linux linux kernel/5.5
- vendor/netapp
- canonical/netapp hci compute node bios
- canonical/netapp hci compute node
- canonical/netapp solidfire \& hci management node
- canonical/netapp solidfire \& hci storage node
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
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