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Vulnerability · Published Oct 22, 2020 · Assigned by mitre

CVE-2020-27675

Medium 4.7

In plain English

A medium-severity security flaw in the linux package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)4.7Medium
Exploit odds (30 days)0.3%top 80.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.9.6-1DEBIAN-CVE-2020-27675
Debian:13linux5.9.6-1DEBIAN-CVE-2020-27675
Debian:14linux5.9.6-1DEBIAN-CVE-2020-27675
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2020-27675
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2020-27675
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2020-27675

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References