CVE-2020-27675 describes a race condition in the Linux kernel (through 5.9.1) when used with Xen (through 4.14.x), specifically within the event-handling loop for paravirtualized devices. This flaw can lead to a use-after-free or NULL pointer dereference, potentially causing a dom0 crash. It is rated Medium severity (CVSS 4.7) due to its local attack vector and high impact on availability, though it requires high attack complexity and low privileges. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 5.9.1CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
31CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | ||
32CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | ||
33CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | ||
9.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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No media coverage found for this CVE.
The average CVE in this peer group has 0.4 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
CVE-2020-27675
Nov 10, 2020kernel: xen: race condition in event-channel removal during the event-handling loop (XSA-331)
Oct 20, 2020An issue was discovered in the Linux kernel through 5.9.1 as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device aka CID-073d0552ead5.
Oct 13, 2020