CVE-2020-29569 is a use-after-free vulnerability in the Linux kernel's PV block backend, affecting Linux kernels through 5.10.1 when used with Xen through 4.14.x. A misbehaving guest can trigger a dom0 crash by rapidly connecting and disconnecting a block frontend, with potential for privilege escalation and information leaks. This vulnerability has a CVSS score of 8.8 (HIGH), indicating a local attack vector with low complexity, leading to high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 4.14.1CPE matchmatch criteria | cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* | ||
>= 4.1.44, < 4.2CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 4.4.80, < 4.4.254CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 4.9.36, < 4.9.249CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 4.11.9, < 4.12CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
ctrlX Multiple Vulnerabilities
Apr 23, 2021ctrlX Multiple Vulnerabilities
Apr 23, 2021ctrlX Multiple Vulnerabilities
Apr 23, 2021ctrlX Multiple Vulnerabilities
Apr 23, 2021ctrlX Multiple Vulnerabilities
Apr 23, 2021ctrlX Multiple Vulnerabilities
Apr 23, 2021An 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.
Dec 8, 2020