Description
An out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvm_coalesced_mmio' object, wherein write indices 'ring->first' and 'ring->last' value could be supplied by a host user-space process. An unprivileged host user or process with access to '/dev/kvm' device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Kernel | all through 5.3 | — |
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 | 5.2.17-1 | — |
| Debian 13 | linux | 5.2.17-1 | — |
| Debian 12 | linux | 5.2.17-1 | — |
| Debian 10 | linux | 4.19.67-2+deb10u1 | DSA-4531-1 |
| Debian 9 | linux | 4.9.189-3+deb9u1 | DSA-4531-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | linux | 3.16.74-1 | DLA-1930-1 |
| Debian 8 | linux-4.9 | 4.9.189-3+deb9u1~deb8u1 | DLA-1940-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-66.75 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1052.54 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-azure | 5.0.0-1023.24~18.04.1 | USN-4157-2 |
| Ubuntu 18.04 LTS | linux-gcp | 5.0.0-1021.21~18.04.1 | USN-4157-2 |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1046.49 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1023.23~18.04.2 | USN-4157-2 |
| Ubuntu 18.04 LTS | linux-hwe | 5.0.0-32.34~18.04.2 | USN-4157-2 |
| Ubuntu 18.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1048.48 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1059.68 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1025.28 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1027.30 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1049.53 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1066.73 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-166.195 | USN-4163-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1096.107 | USN-4163-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1052.54~16.04.1 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1061.66 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1047.50 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-66.75~16.04.1 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1060.67 | USN-4163-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1027.30~16.04.1 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1124.133 | USN-4163-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1128.136 | USN-4163-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2018.18 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1023.28 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1056.60 | USN-4163-2 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1061.66~14.04.1 | USN-4162-2 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-166.195~14.04.1 | USN-4163-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-147.rt24.93.el8 | RHSA-2019:3309 |
| RHEL 8 | perf +26 | 4.18.0-147.el8 | RHSA-2019:3517 |
| RHEL 7 | kernel +15 | 3.10.0-1062.7.1.el7 | RHSA-2019:4154, RHSA-2019:3979 |
| RHEL 7 | kernel-alt +1 | 4.14.0-115.16.1.el7a | RHSA-2019:4154 |
| RHEL 7 | kernel-rt +10 | 3.10.0-1062.7.1.rt56.1030.el7 | RHSA-2019:3978 |
| RHEL 7 | kpatch-patch-3_10_0-1062 | 1-11.el7 | RHSA-2020:0027 |
| RHEL 7 | kpatch-patch-3_10_0-1062_1_1 | 1-10.el7 | RHSA-2020:0027 |
| RHEL 7 | kpatch-patch-3_10_0-1062_1_2 | 1-9.el7 | RHSA-2020:0027 |
| RHEL 7 | kpatch-patch-3_10_0-1062_4_1 | 1-6.el7 | RHSA-2020:0027 |
| RHEL 7 | kpatch-patch-3_10_0-1062_4_2 +1 | 1-3.el7 | RHSA-2020:0027 |
| RHEL 7 | perf +2 | 3.10.0-957.56.1.el7 | RHSA-2020:2851, RHSA-2019:4154, RHSA-2019:3979 |
| RHEL 6 | perf +16 | 2.6.32-754.25.1.el6 | RHSA-2019:4256 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.0 E4S | perf +18 | 4.18.0-80.15.1.el8_0 | RHSA-2020:0204 |
| RHEL 7.6 EUS | perf +18 | 3.10.0-957.56.1.el7 | RHSA-2020:2851 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.16.1 | SUSE-SU-2019:2658-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.21.1 | SUSE-SU-2019:2710-1 |
| SLES 15 | kernel-azure +2 | 4.12.14-5.41.1 | SUSE-SU-2019:2651-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.38.1 | SUSE-SU-2019:2706-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.7.1 | SUSE-SU-2020:0093-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.7.1 | SUSE-SU-2019:3200-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.26.1 | SUSE-SU-2019:2648-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.37.1 | SUSE-SU-2019:2879-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.125.1 | SUSE-SU-2019:2984-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_33 | 1-3.5.1 | SUSE-SU-2019:2984-1 |
| SLES 12 SP1 | kernel-xen +3 | 3.12.74-60.64.124.1 | SUSE-SU-2019:2950-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_37 | 1-2.3.1 | SUSE-SU-2019:2950-1 |
| SLES 12 | kernel-ec2 | 3.12.74-60.64.124.1 | SUSE-SU-2019:2950-1 |
| SLES 11 SP4 | kernel-ec2 +8 | 3.0.101-108.108.1 | SUSE-SU-2019:14218-1 |
| SLES 11 SP4 | ocfs2 | 1.6-0.28.11.2 | SUSE-SU-2019:14218-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.7.1 | SUSE-SU-2020:0093-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.7.1 | SUSE-SU-2019:3200-1 |
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.26.1 | SUSE-SU-2019:2648-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.37.1 | SUSE-SU-2019:2879-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.125.1 | SUSE-SU-2019:2984-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_33 | 1-3.5.1 | SUSE-SU-2019:2984-1 |
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.124.1 | SUSE-SU-2019:2950-1 |
| SLES for SAP 12 SP1 | kgraft-patch-SLE12-SP1_Update_37 | 1-2.3.1 | SUSE-SU-2019:2950-1 |
| SLE Real Time 12 SP4 | kernel-rt +3 | 4.12.14-8.6.1 | SUSE-SU-2019:2756-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.21.1 | SUSE-SU-2019:2710-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_6 | 1-3.3.1 | SUSE-SU-2019:2710-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.38.1 | SUSE-SU-2019:2706-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_15 | 1-1.3.1 | SUSE-SU-2019:2706-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.7.1 | SUSE-SU-2019:3200-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_1 | 1-8.7.1 | SUSE-SU-2019:3200-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_9 | 1-6.5.1 | SUSE-SU-2019:2879-1 |
| SUSE Real Time Module 15 SP1 | kernel-rt +1 | 4.12.14-14.14.3 | SUSE-SU-2019:3295-1 |
| SUSE Real Time Module 15 SP1 | kernel-syms-rt +1 | 4.12.14-14.14.2 | SUSE-SU-2019:3295-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.125.1 | SUSE-SU-2019:2984-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_33 | 1-3.5.1 | SUSE-SU-2019:2984-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
| SUSE Enterprise Storage 5 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SUSE Enterprise Storage 5 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | kernel-docs +8 | 4.12.14-lp151.28.20.1 | openSUSE-SU-2019:2308-1 |
| openSUSE Leap 15.0 | kernel-docs +8 | 4.12.14-lp150.12.76.1 | openSUSE-SU-2019:2307-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | perf +8 | 4.14.146-119.123.amzn2 | ALAS2-2019-1293 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-147.el8 | ELSA-2019-3517 |
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.31.1.1.el7uek | ELSA-2019-4820, ELSA-2019-4808, ELSA-2019-4800 |
| Oracle Linux 7 | kernel-uek-tools +3 | 4.14.35-1902.5.2.2.el7uek | ELSA-2019-4820, ELSA-2019-4799 |
| Oracle Linux 7 | perf +12 | 3.10.0-1062.7.1.el7 | ELSA-2019-4820, ELSA-2019-4799, ELSA-2019-3979 |
Advisories 40
- USN-4163-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-4163-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-4162-2 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-4162-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-4157-2 linux-hwe, linux-azure, linux-gcp, linux-gke-5.0 vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- RHSA-2019:3979 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2020:0027 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2019:3978 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2019:3517 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2019:4154 Red Hat Security Advisory: kernel-alt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2020:0204 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2019:4256 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:2851 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:3309 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-4531-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1930-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1940-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2019:2308-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2879-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2756-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14218-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2950-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2710-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3295-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2307-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2949-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2648-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2984-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2706-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2658-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2651-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0093-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3200-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2019-3979 Important: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 26, 2019
- ELSA-2019-3517 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 14, 2019
- ALAS2-2019-1293 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 23, 2019
- ELSA-2019-4820 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 11, 2019
- ELSA-2019-4808 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 1, 2019
- ELSA-2019-4799 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 20, 2019
- ELSA-2019-4800 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 20, 2019
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14821
- [oss-security] 20190920 CVE-2019-14821 Kernel: KVM: OOB memory access via mmio ring buffer mailing-list
- FEDORA-2019-15e141c6a7 vendor-advisory
- [debian-lts-announce] 20190925 [SECURITY] [DLA 1930-1] linux security update mailing-list
- 20190925 [SECURITY] [DSA 4531-1] linux security update mailing-list
- DSA-4531 vendor-advisory
- [debian-lts-announce] 20191001 [SECURITY] [DLA 1940-1] linux-4.9 security update mailing-list
- FEDORA-2019-a570a92d5a vendor-advisory
- https://security.netapp.com/advisory/ntap-20191004-0001/
- openSUSE-SU-2019:2307 vendor-advisory
- openSUSE-SU-2019:2308 vendor-advisory
- USN-4157-1 vendor-advisory
- USN-4162-1 vendor-advisory
- USN-4157-2 vendor-advisory
- USN-4163-1 vendor-advisory
- USN-4163-2 vendor-advisory
- USN-4162-2 vendor-advisory
- http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html
- RHSA-2019:3309 vendor-advisory
- RHSA-2019:3517 vendor-advisory
- 20191108 [slackware-security] Slackware 14.2 kernel (SSA:2019-311-01) mailing-list
- http://packetstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
- RHSA-2019:3978 vendor-advisory
- RHSA-2019:3979 vendor-advisory
- RHSA-2019:4154 vendor-advisory
- RHSA-2019:4256 vendor-advisory
- RHSA-2020:0027 vendor-advisory
- RHSA-2020:0204 vendor-advisory
- https://www.oracle.com/security-alerts/cpuapr2020.html