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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.9.6-1 | — |
| Debian 13 | linux | 5.9.6-1 | — |
| Debian 12 | linux | 5.9.6-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | linux-hwe-5.8 | 5.8.0-31.33~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oem-5.6 | 5.6.0-1048.52 | USN-4752-1 |
| Ubuntu 20.04 LTS | linux-raspi2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +11 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | linux +3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-240.22.1.rt7.77.el8_3 | RHSA-2021:1081 |
| RHEL 8 | perf +26 | 4.18.0-240.22.1.el8_3 | RHSA-2021:1093 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-abi-whitelists +1 | 4.18.0-240.22.1.el8_3 | ALSA-2021:1093 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-240.22.1.el8_3 | ELSA-2021-1093 |
Advisories 5
- ALSA-2021:1093 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:1093 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2021:1081 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- USN-4752-1 linux-oem-5.6 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- ELSA-2021-1093 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 7, 2021
References
- https://bugzilla.kernel.org/show_bug.cgi?id=208767
- [oss-security] 20201103 CVE-2020-27152 Kernel: KVM: host stack overflow via loop due to lazy update IOAPIC mailing-list
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=77377064c3a94911339f13ce113b3abf265e06da
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.2