CVE-2020-27152

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-11-06 · updated 2026-06-17
Weakness: CWE-835

Description

An issue was discovered in ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before 5.9.2. It has an infinite loop related to improper interaction between a resampler and edge triggering, aka CID-77377064c3a9.

Affected products

Linux kernel: before 5.9.2 — fixed in 5.9.2

How to fix

Upgrade to a fixed version: Linux kernel 5.9.2. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2020/11/03/1
https://bugzilla.kernel.org/show_bug.cgi?id=208767
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=77377064c3a94911339f13ce113b3abf265e06da
http://www.openwall.com/lists/oss-security/2020/11/03/1
https://bugzilla.kernel.org/show_bug.cgi?id=208767
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=77377064c3a94911339f13ce113b3abf265e06da

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