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OpenAdvisories
Medium · 5.5 CVE-2024-56739 EUVD-2024-53382GHSA-42wq-32p9-mf48

rtc: check if __rtc_read_time was successful in rtc_timer_do_work()

Published Dec 29, 2024 · Updated May 11, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: kernel 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-6.11 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-azure-nvidia 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-6.11 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-6.11 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-6.11 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: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

rtc: check if __rtc_read_time was successful in rtc_timer_do_work()

If the __rtc_read_time call fails,, the struct rtc_time tm; may contain
uninitialized data, or an illegal date/time read from the RTC hardware.

When calling rtc_tm_to_ktime later, the result may be a very large value
(possibly KTIME_MAX). If there are periodic timers in rtc->timerqueue,
they will continually expire, may causing kernel softlockup.

Affected products

VendorProductAffectedFixed
Linux Linux 2.6.38 4.19.325

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 6.12.3-1 —
Debian 13 linux 6.12.3-1 —
Debian 12 linux 6.1.123-1 —
Debian 11 linux 5.10.234-1 DLA-4075-1
Debian 11 linux-6.1 6.1.128-1~deb11u1 DLA-4076-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1062.64 —
Ubuntu 24.04 LTS linux 6.8.0-58.60 USN-7449-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1027.29 USN-7449-1
Ubuntu 24.04 LTS linux-azure 6.8.0-1027.32 USN-7449-1
Ubuntu 24.04 LTS linux-azure-6.11 6.11.0-1012.12~24.04.1 —
Ubuntu 24.04 LTS linux-azure-nvidia 6.8.0-1014.15 USN-7468-1
Ubuntu 24.04 LTS linux-gcp 6.8.0-1028.30 USN-7450-1
Ubuntu 24.04 LTS linux-gcp-6.11 6.11.0-1011.11~24.04.1 —
Ubuntu 24.04 LTS linux-gke 6.8.0-1023.27 USN-7450-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1010.12 USN-7450-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1024.24 USN-7449-1
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1026.29 USN-7449-1
Ubuntu 24.04 LTS linux-nvidia-6.11 6.11.0-1007.7 —
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1026.29.1 USN-7449-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1008.8 —
Ubuntu 24.04 LTS linux-oem-6.11 6.11.0-1015.15 USN-7310-1
Ubuntu 24.04 LTS linux-oem-6.8 6.8.0-1026.26 USN-7449-1
Ubuntu 24.04 LTS linux-oracle 6.8.0-1024.25 USN-7449-1
Ubuntu 24.04 LTS linux-raspi 6.8.0-1028.32 USN-7524-1
Ubuntu 24.04 LTS linux-realtime +1 No fix yet —
Ubuntu 24.04 LTS linux-riscv +1 6.8.0-58.60.1 USN-7449-1
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1017.18 —
Ubuntu 22.04 LTS linux +1 5.15.0-135.146 USN-7387-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1080.87 USN-7387-1
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1027.29~22.04.1 USN-7451-1
Ubuntu 22.04 LTS linux-azure 5.15.0-1084.93 USN-7387-1
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1027.32~22.04.1 USN-7449-1
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1084.93.1 —
Ubuntu 22.04 LTS linux-gcp 5.15.0-1079.88 USN-7387-1
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1028.30~22.04.1 USN-7452-1
Ubuntu 22.04 LTS linux-gke +1 5.15.0-1077.83 USN-7387-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1062.70 USN-7387-1
Ubuntu 22.04 LTS linux-hwe-6.8 6.8.0-58.60~22.04.1 USN-7449-2
Ubuntu 22.04 LTS linux-ibm 5.15.0-1072.75 USN-7387-1
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1024.24~22.04.1 —
Ubuntu 22.04 LTS linux-intel-iot-realtime 5.15.0-1073.75 —
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1075.81 USN-7387-1
Ubuntu 22.04 LTS linux-kvm 5.15.0-1076.81 USN-7388-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1074.75 USN-7387-1
Ubuntu 22.04 LTS linux-nvidia-6.8 6.8.0-1026.29~22.04.1 USN-7449-1
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1033.33 USN-7389-1
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1021.21 USN-7389-1
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1024.25~22.04.1 USN-7449-1
Ubuntu 22.04 LTS linux-raspi 5.15.0-1074.77 USN-7387-1
Ubuntu 22.04 LTS linux-riscv +31 No fix yet —
Ubuntu 22.04 LTS linux-riscv-6.8 +1 6.8.0-58.60.1~22.04.1 USN-7449-1
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1044.48 USN-7390-1
Ubuntu 20.04 LTS linux 5.4.0-211.231 USN-7391-1
Ubuntu 20.04 LTS linux-aws 5.4.0-1142.152 USN-7392-3
Ubuntu 20.04 LTS linux-aws-5.15 5.15.0-1080.87~20.04.1 USN-7388-1
Ubuntu 20.04 LTS linux-azure 5.4.0-1147.154 USN-7392-1
Ubuntu 20.04 LTS linux-azure-5.15 5.15.0-1086.95~20.04.1 USN-7421-1
Ubuntu 20.04 LTS linux-azure-fde-5.15 5.15.0-1086.95~20.04.1.1 USN-7421-1
Ubuntu 20.04 LTS linux-bluefield 5.4.0-1101.108 USN-7392-1
Ubuntu 20.04 LTS linux-gcp 5.4.0-1145.154 USN-7392-1
Ubuntu 20.04 LTS linux-gcp-5.15 5.15.0-1081.90~20.04.1 USN-7459-2
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 20.04 LTS linux-hwe-5.15 5.15.0-136.147~20.04.1 USN-7407-1
Ubuntu 20.04 LTS linux-ibm 5.4.0-1088.93 USN-7392-1
Ubuntu 20.04 LTS linux-ibm-5.15 5.15.0-1074.77~20.04.1 USN-7458-1
Ubuntu 20.04 LTS linux-iot 5.4.0-1048.51 USN-7413-1
Ubuntu 20.04 LTS linux-kvm 5.4.0-1129.138 USN-7392-1
Ubuntu 20.04 LTS linux-lowlatency-hwe-5.15 5.15.0-135.146~20.04.1 USN-7387-1
Ubuntu 20.04 LTS linux-oracle 5.4.0-1140.150 USN-7392-1
Ubuntu 20.04 LTS linux-oracle-5.15 +1 5.15.0-1077.83~20.04.1 USN-7459-1, USN-7387-1
Ubuntu 20.04 LTS linux-raspi 5.4.0-1129.142 USN-7539-1
Ubuntu 20.04 LTS linux-riscv-5.15 5.15.0-1075.79~20.04.1 —
Ubuntu 20.04 LTS linux-xilinx-zynqmp 5.4.0-1060.64 USN-7392-1
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Show 16 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 6.8.0-2023.24 USN-7523-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1020.21 USN-7453-1
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1073.75 USN-7387-3
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1080.88 USN-7387-3
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1020.21~22.04.1 —
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 5.15.0-1080.87+fips1 USN-7387-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1083.92+fips1 USN-7387-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-135.146+fips1 USN-7387-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1079.88+fips1 USN-7387-2
Ubuntu Pro FIPS-updates 20.04 LTS linux-aws-fips 5.4.0-1142.153+fips1 USN-7392-4
Ubuntu Pro FIPS-updates 20.04 LTS linux-azure-fips 5.4.0-1147.154+fips1 USN-7392-2
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips 5.4.0-1116.126 USN-7393-1
Ubuntu Pro FIPS-updates 20.04 LTS linux-gcp-fips 5.4.0-1145.154+fips1 USN-7392-2
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 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1039.39~20.04.1 —
Ubuntu Pro 18.04 LTS linux +5 No fix yet —
Ubuntu Pro 18.04 LTS linux-aws-5.4 5.4.0-1142.152~18.04.1 USN-7401-1
Ubuntu Pro 18.04 LTS linux-azure-5.4 5.4.0-1147.154~18.04.1 USN-7392-1
Ubuntu Pro 18.04 LTS linux-gcp-5.4 5.4.0-1145.154~18.04.1 USN-7392-1
Ubuntu Pro 18.04 LTS linux-hwe-5.4 5.4.0-211.231~18.04.1 USN-7391-1
Ubuntu Pro 18.04 LTS linux-ibm-5.4 5.4.0-1090.95~18.04.1 USN-7463-1
Ubuntu Pro 18.04 LTS linux-oracle-5.4 5.4.0-1140.149~18.04.1 USN-7392-1
Ubuntu Pro 18.04 LTS linux-raspi-5.4 5.4.0-1129.142~18.04.1 USN-7540-1
Ubuntu Pro 16.04 LTS linux +7 No fix yet —
Ubuntu Pro 14.04 LTS linux +3 No fix yet —
ReleasePackageFixed inAdvisory
RHEL 9 rv +75 5.14.0-611.5.1.el9_7 RHSA-2025:20518

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 9 rv +73 5.14.0-611.5.1.el9_7 ALSA-2025:20518

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 9 kernel 5.14.0-611.5.1.el9_7 RLSA-2025:20518
ReleasePackageFixed inAdvisory
SLES 15 SP6 kernel-64kb +6 6.4.0-150600.23.38.1 SUSE-SU-2025:0499-1
SLES 15 SP6 kernel-azure +2 6.4.0-150600.8.26.1 SUSE-SU-2025:0428-1
SLES 15 SP6 kernel-coco +3 6.4.0-15061.12.coco15sp6.1 SUSE-SU-2025:0289-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.38.1.150600.12.16.2 SUSE-SU-2025:0499-1
SLES 15 SP5 kernel-64kb +6 5.14.21-150500.55.94.1 SUSE-SU-2025:0577-2, SUSE-SU-2025:0577-1
SLES 15 SP5 kernel-default-base 5.14.21-150500.55.94.1.150500.6.43.1 SUSE-SU-2025:0577-2, SUSE-SU-2025:0577-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.247.1 SUSE-SU-2025:0565-1
Show 9 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 15 SP5 kernel-default-base 5.14.21-150500.55.94.1.150500.6.43.1 SUSE-SU-2025:0577-2, SUSE-SU-2025:0577-1
SLES for SAP 15 SP5 kernel-docs +4 5.14.21-150500.55.94.1 SUSE-SU-2025:0577-2, SUSE-SU-2025:0577-1
SLE Micro 6.1 kernel-default-base 6.4.0-24.1.21.4 SUSE-SU-2025:20248-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_5 1-1.1 SUSE-SU-2025:20249-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_5 1-1.2 SUSE-SU-2025:20248-1
SLE Micro 6.1 kernel-rt +4 6.4.0-25.1 SUSE-SU-2025:20249-1, SUSE-SU-2025:20248-1
SLE Micro 6.0 kernel-default-base 6.4.0-24.1.21.4 SUSE-SU-2025:20165-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_5 1-1.1 SUSE-SU-2025:20166-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_5 1-1.2 SUSE-SU-2025:20165-1
SLE Micro 6.0 kernel-rt +4 6.4.0-25.1 SUSE-SU-2025:20166-1, SUSE-SU-2025:20165-1
SLE Micro 5.5 kernel-default-base 5.14.21-150500.55.94.1.150500.6.43.1 SUSE-SU-2025:0577-2, SUSE-SU-2025:0577-1
SLE Micro 5.5 kernel-rt +1 5.14.21-150500.13.85.1 SUSE-SU-2025:0556-1
SLE Micro 5.5 kernel-source +1 5.14.21-150500.55.94.1 SUSE-SU-2025:0577-2, SUSE-SU-2025:0577-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.38.1 SUSE-SU-2025:0499-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_8 1-150600.1.3.1 SUSE-SU-2025:0557-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_8 1-150600.13.3.2 SUSE-SU-2025:0499-1
SLE Live Patching 15 SP5 kernel-default 5.14.21-150500.55.94.1 SUSE-SU-2025:0577-1
SLE Live Patching 15 SP5 kernel-livepatch-SLE15-SP5_Update_23 1-150500.11.3.1 SUSE-SU-2025:0577-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.247.1 SUSE-SU-2025:0565-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_65 1-8.3.1 SUSE-SU-2025:0565-1
SLE HPC 15 SP5 kernel-64kb +5 5.14.21-150500.55.94.1 SUSE-SU-2025:0577-2, SUSE-SU-2025:0577-1
SLE HPC 15 SP5 kernel-default-base 5.14.21-150500.55.94.1.150500.6.43.1 SUSE-SU-2025:0577-2, SUSE-SU-2025:0577-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.26.1 SUSE-SU-2025:0557-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.6 dtb-aarch64 +10 6.4.0-150600.23.38.1 SUSE-SU-2025:0499-1
openSUSE Leap 15.6 kernel-azure +2 6.4.0-150600.8.26.1 SUSE-SU-2025:0428-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.38.1.150600.12.16.2 SUSE-SU-2025:0499-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.26.1 SUSE-SU-2025:0557-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.1.124-134.200 1.0-0.amzn2023 ALAS2023-2025-809
Amazon Linux 2023 perf +14 6.1.124-134.200.amzn2023 ALAS2023-2025-809

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel 6.6.64.2-1 —
Azure Linux 2 (CBL-Mariner) kernel 5.15.176.3-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 9 kernel-uek +34 6.12.0-101.33.4.3.el10uek ELSA-2025-20530, ELSA-2025-20480
Oracle Linux 8 bpftool +13 5.15.0-305.176.4.el9uek ELSA-2025-20095
Oracle Linux 7 kernel-uek +6 5.4.17-2136.340.4.1.el8uek ELSA-2025-20100
Oracle Linux 7 kernel-uek-tools 5.4.17-2136.340.4.1.el7uek ELSA-2025-20100

Advisories 50

References