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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-27152
• 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