Skip to content
OpenAdvisories
Unscored CVE-2024-44948 EUVD-2024-41153GHSA-7p6j-4w59-cjvv

x86/mtrr: Check if fixed MTRRs exist before saving them

Published Sep 4, 2024 · Updated Oct 15, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fips Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-ibm-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-lts-xenial Package: linux-nvidia Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

In the Linux kernel, the following vulnerability has been resolved:

x86/mtrr: Check if fixed MTRRs exist before saving them

MTRRs have an obsolete fixed variant for fine grained caching control
of the 640K-1MB region that uses separate MSRs. This fixed variant has
a separate capability bit in the MTRR capability MSR.

So far all x86 CPUs which support MTRR have this separate bit set, so it
went unnoticed that mtrr_save_state() does not check the capability bit
before accessing the fixed MTRR MSRs.

Though on a CPU that does not support the fixed MTRR capability this
results in a #GP. The #GP itself is harmless because the RDMSR fault is
handled gracefully, but results in a WARN_ON().

Add the missing capability check to prevent this.

Affected products

VendorProductAffectedFixed
Linux Linux 2.6.22 4.19.320

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.

ReleasePackageFixed inAdvisory
Debian 14 linux 6.10.6-1 —
Debian 13 linux 6.10.6-1 —
Debian 12 linux 6.1.106-1 —
Debian 11 linux 5.10.226-1 DLA-3912-1
Debian 11 linux-6.1 6.1.119-1~deb11u1 DLA-4008-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1056.58 —
Ubuntu 24.04 LTS linux 6.8.0-50.51 USN-7154-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1020.22 USN-7154-1
Ubuntu 24.04 LTS linux-azure 6.8.0-1020.23 USN-7196-1
Ubuntu 24.04 LTS linux-gcp +1 6.8.0-1019.21 USN-7155-1, USN-7154-1
Ubuntu 24.04 LTS linux-gke 6.8.0-1015.19 USN-7154-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1002.4 USN-7156-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1017.17 USN-7154-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1019.21.1 USN-7155-1
Ubuntu 24.04 LTS linux-oem-6.8 6.8.0-1018.18 USN-7154-1
Ubuntu 24.04 LTS linux-oracle +1 6.8.0-1017.18 USN-7154-1
Ubuntu 24.04 LTS linux-raspi 6.8.0-1016.18 USN-7154-1
Ubuntu 24.04 LTS linux-riscv +1 6.8.0-50.51.1 USN-7154-1
Ubuntu 22.04 LTS linux +1 5.15.0-125.135 USN-7100-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1072.78 USN-7100-2
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1020.22~22.04.1 USN-7154-1
Ubuntu 22.04 LTS linux-azure 5.15.0-1075.84 USN-7123-1
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1020.23~22.04.1 USN-7196-1
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1076.85.1 —
Ubuntu 22.04 LTS linux-gcp 5.15.0-1071.79 USN-7100-1
Ubuntu 22.04 LTS linux-gcp-6.8 +1 6.8.0-1019.21~22.04.1 USN-7155-1, USN-7154-1
Ubuntu 22.04 LTS linux-gke 5.15.0-1069.75 USN-7100-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1055.62 USN-7100-1
Ubuntu 22.04 LTS linux-hwe-6.8 6.8.0-50.51~22.04.1 USN-7154-2
Ubuntu 22.04 LTS linux-ibm +1 5.15.0-1065.68 USN-7100-1
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1017.17~22.04.1 —
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1067.73 USN-7144-1
Ubuntu 22.04 LTS linux-kvm 5.15.0-1069.74 USN-7100-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1067.68 USN-7100-1
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1032.32 —
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1020.20 —
Ubuntu 22.04 LTS linux-oracle 5.15.0-1070.76 USN-7100-1
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1017.18~22.04.1 USN-7154-1
Ubuntu 22.04 LTS linux-riscv +31 No fix yet —
Ubuntu 22.04 LTS linux-riscv-6.8 +1 6.8.0-50.51.1~22.04.1 USN-7154-1
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1038.42 USN-7100-1
Ubuntu 20.04 LTS linux 5.4.0-200.220 USN-7088-1
Ubuntu 20.04 LTS linux-aws 5.4.0-1135.145 USN-7088-4
Ubuntu 20.04 LTS linux-aws-5.15 5.15.0-1072.78~20.04.1 USN-7100-1
Ubuntu 20.04 LTS linux-azure 5.4.0-1140.147 USN-7088-2
Ubuntu 20.04 LTS linux-azure-5.15 5.15.0-1078.87~20.04.1 USN-7194-1
Ubuntu 20.04 LTS linux-bluefield 5.4.0-1095.102 USN-7088-2
Ubuntu 20.04 LTS linux-gcp 5.4.0-1139.148 USN-7088-1
Ubuntu 20.04 LTS linux-gcp-5.15 5.15.0-1071.79~20.04.1 USN-7100-1
Ubuntu 20.04 LTS linux-gke +26 No fix yet —
Ubuntu 20.04 LTS linux-gkeop 5.4.0-1102.106 USN-7088-1
Ubuntu 20.04 LTS linux-gkeop-5.15 5.15.0-1055.62~20.04.1 USN-7100-1
Ubuntu 20.04 LTS linux-hwe-5.15 +1 5.15.0-125.135~20.04.1 USN-7100-1
Ubuntu 20.04 LTS linux-ibm 5.4.0-1082.87 USN-7088-1
Ubuntu 20.04 LTS linux-ibm-5.15 5.15.0-1065.68~20.04.1 USN-7100-1
Ubuntu 20.04 LTS linux-intel-iotg-5.15 5.15.0-1067.73~20.04.1 USN-7144-1
Ubuntu 20.04 LTS linux-iot 5.4.0-1044.45 USN-7119-1
Ubuntu 20.04 LTS linux-kvm 5.4.0-1123.131 USN-7088-4
Ubuntu 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1032.32~20.04.1 —
Ubuntu 20.04 LTS linux-oracle 5.4.0-1134.143 USN-7088-4
Ubuntu 20.04 LTS linux-oracle-5.15 5.15.0-1070.76~20.04.1 USN-7100-1
Ubuntu 20.04 LTS linux-raspi 5.4.0-1119.131 USN-7088-5
Ubuntu 20.04 LTS linux-riscv-5.15 5.15.0-1068.72~20.04.1 —
Ubuntu 20.04 LTS linux-xilinx-zynqmp 5.4.0-1054.58 USN-7088-4
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Show 15 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2015.16 —
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1013.14 —
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1066.68 —
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1073.81 —
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1013.14~22.04.1 —
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 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 24.04 LTS linux-fips 6.8.0-78.78+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1072.78+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1075.84+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-125.135+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1071.79+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-aws-fips 5.4.0-1135.145+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-azure-fips 5.4.0-1140.147+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips 5.4.0-1109.119 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-gcp-fips 5.4.0-1139.148+fips1 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 18.04 LTS linux +5 No fix yet —
Ubuntu Pro 18.04 LTS linux-aws-5.4 5.4.0-1135.145~18.04.1 USN-7088-3
Ubuntu Pro 18.04 LTS linux-azure-5.4 5.4.0-1140.147~18.04.1 USN-7088-4
Ubuntu Pro 18.04 LTS linux-gcp-5.4 5.4.0-1139.148~18.04.1 USN-7088-1
Ubuntu Pro 18.04 LTS linux-hwe-5.4 5.4.0-200.220~18.04.1 USN-7088-1
Ubuntu Pro 18.04 LTS linux-ibm-5.4 5.4.0-1082.87~18.04.1 USN-7088-1
Ubuntu Pro 18.04 LTS linux-oracle-5.4 5.4.0-1134.143~18.04.1 USN-7088-3
Ubuntu Pro 18.04 LTS linux-raspi-5.4 5.4.0-1119.131~18.04.1 USN-7088-5
Ubuntu Pro 16.04 LTS linux +7 No fix yet —
Ubuntu Pro 14.04 LTS linux +3 No fix yet —
ReleasePackageFixed inAdvisory
SLES 15 SP6 kernel-64kb +4 6.4.0-150600.23.25.1 SUSE-SU-2024:3561-1
SLES 15 SP6 kernel-azure +2 6.4.0-150600.8.14.1 SUSE-SU-2024:3551-1
SLES 15 SP6 kernel-coco +3 6.4.0-15061.6.coco15sp6.1 SUSE-SU-2024:3553-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.25.1.150600.12.10.2 SUSE-SU-2024:3561-1
SLES 15 SP6 kernel-docs +1 6.4.0-150600.23.25.2 SUSE-SU-2024:3561-1
SLES 15 SP5 kernel-64kb +6 5.14.21-150500.55.83.1 SUSE-SU-2024:3569-1
SLES 15 SP5 kernel-azure +2 5.14.21-150500.33.69.1 SUSE-SU-2024:3587-1
SLES 15 SP5 kernel-default-base 5.14.21-150500.55.83.1.150500.6.37.1 SUSE-SU-2024:3569-1
SLES 12 SP5 kernel-azure +2 4.12.14-16.200.1 SUSE-SU-2024:3591-1
SLES 12 SP5 kernel-docs +4 4.12.14-122.231.1 SUSE-SU-2024:3559-1
Show 9 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 12 SP5 kernel-azure +2 4.12.14-16.200.1 SUSE-SU-2024:3591-1
SLES for SAP 12 SP5 kernel-syms +2 4.12.14-122.231.1 SUSE-SU-2024:3559-1
SLE Real Time 12 SP5 kernel-rt +3 4.12.14-10.203.1 SUSE-SU-2024:3566-1
SLE Micro 6.0 kernel-default-base 6.4.0-17.1.1.51 SUSE-SU-2025:20073-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_3 +1 1-1.2 SUSE-SU-2025:20077-1, SUSE-SU-2025:20073-1
SLE Micro 6.0 kernel-rt +1 6.4.0-11.1 SUSE-SU-2025:20077-1
SLE Micro 6.0 kernel-source +2 6.4.0-20.1 SUSE-SU-2025:20073-1
SLE Micro 5.5 kernel-default 5.14.21-150500.55.83.1 SUSE-SU-2024:3569-1
SLE Micro 5.5 kernel-default-base 5.14.21-150500.55.83.1.150500.6.37.1 SUSE-SU-2024:3569-1
SLE Micro 5.5 kernel-rt +1 5.14.21-150500.13.73.1 SUSE-SU-2024:3592-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.25.1 SUSE-SU-2024:3561-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_4 1-150600.1.3.1 SUSE-SU-2024:3564-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_5 1-150600.13.3.1 SUSE-SU-2024:3561-1
SLE Live Patching 15 SP5 kernel-default 5.14.21-150500.55.83.1 SUSE-SU-2024:3569-1
SLE Live Patching 15 SP5 kernel-livepatch-SLE15-SP5_Update_20 +1 1-150500.11.3.1 SUSE-SU-2024:3592-1, SUSE-SU-2024:3569-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.231.1 SUSE-SU-2024:3559-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_61 1-8.3.1 SUSE-SU-2024:3559-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.14.1 SUSE-SU-2024:3564-1
SUSE Real Time Module 15 SP5 kernel-rt +3 5.14.21-150500.13.73.1 SUSE-SU-2024:3592-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.6 dtb-aarch64 +8 6.4.0-150600.23.25.1 SUSE-SU-2024:3561-1
openSUSE Leap 15.6 kernel-azure +2 6.4.0-150600.8.14.1 SUSE-SU-2024:3551-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.25.1.150600.12.10.2 SUSE-SU-2024:3561-1
openSUSE Leap 15.6 kernel-docs +1 6.4.0-150600.23.25.2 SUSE-SU-2024:3561-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.14.1 SUSE-SU-2024:3564-1
openSUSE Leap 15.5 kernel-azure +2 5.14.21-150500.33.69.1 SUSE-SU-2024:3587-1
openSUSE Leap 15.5 kernel-rt +3 5.14.21-150500.13.73.1 SUSE-SU-2024:3592-1
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
openSUSE Leap Micro 5.5 kernel-default 5.14.21-150500.55.83.1 SUSE-SU-2024:3569-1
openSUSE Leap Micro 5.5 kernel-default-base 5.14.21-150500.55.83.1.150500.6.37.1 SUSE-SU-2024:3569-1
openSUSE Leap Micro 5.5 kernel-rt 5.14.21-150500.13.73.1 SUSE-SU-2024:3592-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.1.106-116.188 1.0-0.amzn2023 ALAS2023-2025-864
Amazon Linux 2023 perf +14 6.1.106-116.188.amzn2023 ALAS2023-2025-864
Amazon Linux 2 kernel-livepatch-4.14.353-270.569 1.0-0.amzn2 ALAS2-2025-2777
Amazon Linux 2 perf +8 4.14.353-270.569.amzn2 ALAS2-2025-2777

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 8 bpftool +13 5.15.0-302.167.6.el9uek ELSA-2024-12815
Oracle Linux 7 kernel-uek-container +1 5.4.17-2136.336.5.1.el8uek ELSA-2024-12782
Oracle Linux 7 perf +10 4.14.35-2047.543.3.el7uek ELSA-2024-12868, ELSA-2024-12780

Advisories 39

References