Description
An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users can cause a denial of service (host OS hang) via a high rate of events to dom0, aka CID-e99502f76271.
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 | — |
| Debian 9 | linux | 4.9.246-1 | DLA-2494-1 |
| Debian 9 | linux-4.19 | 4.19.160-2~deb9u1 | DLA-2483-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-59.65 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1034.35 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1035.36 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1033.35 | — |
| Ubuntu 20.04 LTS | linux-hwe-5.8 | 5.8.0-44.50~20.04.1 | USN-4751-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1031.32 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1034.36 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1026.29 | — |
| Ubuntu 20.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.8 | 5.8.0-17.19~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-129.132 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1091.96 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1034.35~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1103.114 | — |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1035.36~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1010.14 | — |
| Ubuntu 18.04 LTS | linux-gcp +12 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1091.104 | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 +1 | 5.4.0-1033.35~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1008.9~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-59.65~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1082.84 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1062.68 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1034.36~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1026.29~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi2 +1 | 4.15.0-1077.82 | — |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1094.103 | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-198.230 | — |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1119.133 | — |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1091.96~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1103.114~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1091.104~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-129.132~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1085.94 | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1062.68~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1143.153 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1147.157 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2034.35 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2016.18 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1049.56 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1052.58 | — |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1114.123~20.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1083.87 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1103.114~14.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-198.230~14.04.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +5 | 5.3.18-59.5.2 | SUSE-SU-2021:1977-1 |
| SLES 15 SP3 | kernel-azure +2 | 5.3.18-38.3.1 | SUSE-SU-2021:1975-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-59.5.2.18.2.2 | SUSE-SU-2021:1977-1 |
| SLES 15 SP3 | kernel-syms +1 | 5.3.18-59.5.1 | SUSE-SU-2021:1977-1 |
| SLES 15 SP2 | kernel-azure +2 | 5.3.18-18.24.1 | SUSE-SU-2020:3491-1 |
| SLES 15 SP2 | xen | 4.13.1_10-3.13.1 | SUSE-SU-2020:3049-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.67.1 | SUSE-SU-2021:1624-1, SUSE-SU-2020:3272-1 |
| SLES 15 SP1 | xen | 4.12.3_10-3.31.1 | SUSE-SU-2020:3051-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.63.1 | SUSE-SU-2021:1573-1, SUSE-SU-2020:3532-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.34.1 | SUSE-SU-2020:3281-1 |
| SLES 12 SP5 | xen | 4.12.3_10-3.27.1 | SUSE-SU-2020:3050-1 |
Show 26 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.65.1 | SUSE-SU-2021:1596-1, SUSE-SU-2020:3544-1 |
| SLES 12 SP4 | xen | 4.11.4_10-2.39.2 | SUSE-SU-2020:3088-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.144.1 | SUSE-SU-2021:1623-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_39 | 1-4.3.1 | SUSE-SU-2021:1623-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.149.1 | SUSE-SU-2021:0437-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_39 | 1-3.3.1 | SUSE-SU-2021:0437-1 |
| SLES for SAP 15 SP1 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SLES for SAP 15 SP1 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.63.1 | SUSE-SU-2021:1573-1, SUSE-SU-2020:3532-1 |
| SLES for SAP 15 | xen | 4.10.4_18-3.44.1 | SUSE-SU-2020:3052-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.34.1 | SUSE-SU-2020:3281-1 |
| SLES for SAP 12 SP5 | xen | 4.12.3_10-3.27.1 | SUSE-SU-2020:3050-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.65.1 | SUSE-SU-2021:1596-1, SUSE-SU-2020:3544-1 |
| SLES for SAP 12 SP4 | xen | 4.11.4_10-2.39.2 | SUSE-SU-2020:3088-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.144.1 | SUSE-SU-2021:1623-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_39 | 1-4.3.1 | SUSE-SU-2021:1623-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.149.1 | SUSE-SU-2021:0437-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_39 | 1-3.3.1 | SUSE-SU-2021:0437-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.37.1 | SUSE-SU-2021:1176-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-59.5.2 | SUSE-SU-2021:1977-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_1 | 1-7.5.1 | SUSE-SU-2021:1977-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.67.1 | SUSE-SU-2021:1624-1, SUSE-SU-2020:3272-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_18 | 1-3.3.1 | SUSE-SU-2020:3272-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_24 | 1-3.3.2 | SUSE-SU-2021:1624-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.63.1 | SUSE-SU-2021:1573-1, SUSE-SU-2020:3532-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_21 | 1-1.5.1 | SUSE-SU-2020:3532-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_24 | 1-1.3.1 | SUSE-SU-2021:1573-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.65.1 | SUSE-SU-2021:1596-1, SUSE-SU-2020:3544-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_17 | 1-6.5.1 | SUSE-SU-2020:3544-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_20 | 1-6.3.1 | SUSE-SU-2021:1596-1 |
| SLE HPC 15 SP1 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SLE HPC 15 SP1 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.63.1 | SUSE-SU-2021:1573-1, SUSE-SU-2020:3532-1 |
| SLE HPC 15 | xen | 4.10.4_18-3.44.1 | SUSE-SU-2020:3052-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.65.1 | SUSE-SU-2021:1596-1, SUSE-SU-2020:3544-1 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_10-2.39.2 | SUSE-SU-2020:3088-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.144.1 | SUSE-SU-2021:1623-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_39 | 1-4.3.1 | SUSE-SU-2021:1623-1 |
| SUSE OpenStack Cloud 9 | kernel-syms +2 | 4.12.14-95.65.1 | SUSE-SU-2021:1596-1, SUSE-SU-2020:3544-1 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_10-2.39.2 | SUSE-SU-2020:3088-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.144.1 | SUSE-SU-2021:1623-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_39 | 1-4.3.1 | SUSE-SU-2021:1623-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.149.1 | SUSE-SU-2021:0437-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_39 | 1-3.3.1 | SUSE-SU-2021:0437-1 |
| SUSE Manager Server 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Server 4.0 | kernel-syms +4 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE Manager Retail Branch Server 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Retail Branch Server 4.0 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE Manager Proxy 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Proxy 4.0 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.144.1 | SUSE-SU-2021:1623-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_39 | 1-4.3.1 | SUSE-SU-2021:1623-1 |
| SUSE Enterprise Storage 6 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Enterprise Storage 6 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | kernel-64kb +7 | 5.3.18-59.5.2 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.3 | kernel-azure +2 | 5.3.18-38.3.1 | openSUSE-SU-2021:1975-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-59.5.2.18.2.2 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.3 | kernel-syms +2 | 5.3.18-59.5.1 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.2 | xen | 4.13.1_10-lp152.2.12.1 | openSUSE-SU-2020:1783-1 |
| openSUSE Leap 15.1 | xen | 4.12.3_10-lp151.2.27.1 | openSUSE-SU-2020:1844-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.209-160.335 | 1.0-0.amzn2 | ALAS2-2020-1566 |
| Amazon Linux 2 | perf +8 | 4.14.209-160.335.amzn2 | ALAS2-2020-1566 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.46.4.1.el7uek | ELSA-2021-9009, ELSA-2020-5996, ELSA-2020-5995 |
| Oracle Linux 7 | perf +5 | 4.14.35-2025.403.3.el7uek | ELSA-2020-5996, ELSA-2020-5995 |
Advisories 29
- USN-4751-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-2494-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2483-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:1623-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3049-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3544-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1783-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3491-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1573-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3532-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1975-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1596-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0437-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1624-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3050-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1977-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3281-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3052-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3088-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1176-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1844-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1975-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2021:1977-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2020:3051-1 Security update for xen SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2020:3272-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2021-9009 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 12, 2021
- ELSA-2020-5996 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 15, 2020
- ELSA-2020-5995 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 14, 2020
- ALAS2-2020-1566 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 8, 2020
References
- https://xenbits.xen.org/xsa/advisory-332.html
- https://github.com/torvalds/linux/commit/e99502f76271d6bc4e374fe368c50c67a1fd3070
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e99502f76271d6bc4e374fe368c50c67a1fd3070
- openSUSE-SU-2020:1783 vendor-advisory
- openSUSE-SU-2020:1844 vendor-advisory
- GLSA-202011-06 vendor-advisory
- [debian-lts-announce] 20201210 [SECURITY] [DLA 2483-1] linux-4.19 security update mailing-list
- [debian-lts-announce] 20201218 [SECURITY] [DLA 2494-1] linux security update mailing-list
- [oss-security] 20210119 Xen Security Advisory 332 v4 (CVE-2020-27673) - Rogue guests can cause DoS of Dom0 via high frequency events mailing-list