CVE-2020-27675
Medium
Description
An 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.
SeverityMedium
CVSS4.7
Exploit probability—
Product
Linux Kernel
PublishedOct 22, 2020
First seenOct 22, 2020
How to fix
Vendor advisories
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3ZG6TZLD23QO3PV2AN2HB625ZX47ALTT/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6USZ4APZSBQDHGJLJMHW5JBN4QZV6SKZ/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNF2R7FUT4IOJ2RIRGQ7X5R4F4FVVLSR/
- security.gentoo.org/glsa/202011-06
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v ≤ 5.9.1 | — |
| fedoraproject fedora | 31, 32, 33 | — |
| debian debian_linux | 9.0 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.