CVE-2024-56739: rtc: check if __rtc_read_time was successful in rtc_timer_do_work()

Q: What is the severity of CVE-2024-56739?

CVE-2024-56739 is considered a medium severity vulnerability due to potential exposure to uninitialized data.

Q: How do I fix CVE-2024-56739?

To mitigate CVE-2024-56739, upgrade the Linux kernel to a version that addresses this vulnerability.

Q: Which versions of the Linux kernel are affected by CVE-2024-56739?

CVE-2024-56739 affects Linux kernel versions from 2.6.38 up to 6.12.2.

Q: What is the impacts of CVE-2024-56739?

The impact of CVE-2024-56739 may include the use of uninitialized data leading to unreliable or improper date and time readings.

Q: Is there a workaround for CVE-2024-56739?

Currently, there are no recommended workarounds for CVE-2024-56739, so applying the patch is essential.

Published Dec 29, 2024

Updated

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

rtc: check if rtcreadtime was successful in rtctimerdowork()

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

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

Other sources

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

rtc: check if rtcreadtime was successful in rtctimerdowork()

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

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

— IBM

This CVE was automatically created from a reference found in an email or other text. If you are reading this, then this CVE entry is probably erroneous, since this text should be replaced by the official CVE description automatically.

— Launchpad

Affected Software

221 affected componentsFixes available

Linux Linux kernel>=2.6.38<4.19.325

Linux Linux kernel>=4.20<5.4.287

Linux Linux kernel>=5.5<5.10.231

Linux Linux kernel>=5.11<5.15.174

Linux Linux kernel>=5.16<6.1.120

Linux Linux kernel>=6.2<6.6.64

Linux Linux kernel>=6.7<6.11.11

Linux Linux kernel>=6.12<6.12.2

IBM Verify Identity Access<=11.0 - 11.0.2

IBM Security Verify Access<=10.0 - 10.0.9.1

IBM Verify Identity Access Container<=11.0 - 11.0.2

IBM Security Verify Access Container<=10.0 - 10.0.9.1

debian/linux<6.1.123-1

6.1.123-1

debian/linux<6.12.3-1

6.12.3-1

debian/linux<6.12.3-1

6.12.3-1

debian/linux

6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1142.152~18.04.1

5.4.0-1142.152~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1147.154~18.04.1

5.4.0-1147.154~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1145.154~18.04.1

5.4.0-1145.154~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-211.231~18.04.1

5.4.0-211.231~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1090.95~18.04.1

5.4.0-1090.95~18.04.1

ubuntu/linux-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1140.149~18.04.1

5.4.0-1140.149~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1129.142~18.04.1

5.4.0-1129.142~18.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-211.231

5.4.0-211.231

ubuntu/linux-aws<5.4.0-1142.152

5.4.0-1142.152

ubuntu/linux-aws-5.15<5.15.0-1080.87~20.04.1

5.15.0-1080.87~20.04.1

ubuntu/linux-azure<5.4.0-1147.154

5.4.0-1147.154

ubuntu/linux-azure-5.15<5.15.0-1086.95~20.04.1

5.15.0-1086.95~20.04.1

ubuntu/linux-bluefield<5.4.0-1101.108

5.4.0-1101.108

ubuntu/linux-gcp<5.4.0-1145.154

5.4.0-1145.154

ubuntu/linux-gcp-5.15<5.15.0-1081.90~20.04.1

5.15.0-1081.90~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-136.147~20.04.1

5.15.0-136.147~20.04.1

ubuntu/linux-ibm<5.4.0-1088.93

5.4.0-1088.93

ubuntu/linux-ibm-5.15<5.15.0-1074.77~20.04.1

5.15.0-1074.77~20.04.1

ubuntu/linux-intel-iotg-5.15<5.15.0-1077.83~20.04.1

5.15.0-1077.83~20.04.1

ubuntu/linux-iot<5.4.0-1048.51

5.4.0-1048.51

ubuntu/linux-kvm<5.4.0-1129.138

5.4.0-1129.138

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-135.146~20.04.1

5.15.0-135.146~20.04.1

ubuntu/linux-oracle<5.4.0-1140.150

5.4.0-1140.150

ubuntu/linux-oracle-5.15<5.15.0-1077.83~20.04.1

5.15.0-1077.83~20.04.1

ubuntu/linux-raspi<5.4.0-1129.142

5.4.0-1129.142

ubuntu/linux-riscv-5.15<5.15.0-1075.79~20.04.1

5.15.0-1075.79~20.04.1

ubuntu/linux-xilinx-zynqmp<5.4.0-1060.64

5.4.0-1060.64

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.8*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

ubuntu/linux-gkeop*

ubuntu/linux-gkeop-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1039.39~20.04.1

5.15.0-1039.39~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.8*

ubuntu/linux-aws-fips<5.4.0-1142.153+fips1

5.4.0-1142.153+fips1

ubuntu/linux-azure-fips<5.4.0-1147.154+fips1

5.4.0-1147.154+fips1

ubuntu/linux-fips<5.4.0-1116.126

5.4.0-1116.126

ubuntu/linux-gcp-fips<5.4.0-1145.154+fips1

5.4.0-1145.154+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-135.146

5.15.0-135.146

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1080.87

5.15.0-1080.87

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1027.29~22.04.1

6.8.0-1027.29~22.04.1

ubuntu/linux-azure<5.15.0-1084.93

5.15.0-1084.93

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1027.32~22.04.1

6.8.0-1027.32~22.04.1

ubuntu/linux-azure-fde<5.15.0-1084.93.1

5.15.0-1084.93.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1079.88

5.15.0-1079.88

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1028.30~22.04.1

6.8.0-1028.30~22.04.1

ubuntu/linux-gke<5.15.0-1077.83

5.15.0-1077.83

ubuntu/linux-gkeop<5.15.0-1062.70

5.15.0-1062.70

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-58.60~22.04.1

6.8.0-58.60~22.04.1

ubuntu/linux-ibm<5.15.0-1072.75

5.15.0-1072.75

ubuntu/linux-ibm-6.8<6.8.0-1024.24~22.04.1

6.8.0-1024.24~22.04.1

ubuntu/linux-intel-iot-realtime<5.15.0-1073.75

5.15.0-1073.75

ubuntu/linux-intel-iotg<5.15.0-1075.81

5.15.0-1075.81

ubuntu/linux-kvm<5.15.0-1076.81

5.15.0-1076.81

ubuntu/linux-lowlatency<5.15.0-135.146

5.15.0-135.146

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-58.60.1~22.04.1

6.8.0-58.60.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1074.75

5.15.0-1074.75

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1026.29~22.04.1

6.8.0-1026.29~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1033.33

5.15.0-1033.33

ubuntu/linux-nvidia-tegra-igx<5.15.0-1021.21

5.15.0-1021.21

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1077.83

5.15.0-1077.83

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1024.25~22.04.1

6.8.0-1024.25~22.04.1

ubuntu/linux-raspi<5.15.0-1074.77

5.15.0-1074.77

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-58.60.1~22.04.1

6.8.0-58.60.1~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1044.48

5.15.0-1044.48

ubuntu/linux-bluefield<5.15.0-1062.64

5.15.0-1062.64

ubuntu/linux-realtime<5.15.0-1080.88

5.15.0-1080.88

ubuntu/linux-realtime-6.8<6.8.1-1020.21~22.04.1

6.8.1-1020.21~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1080.87+fips1

5.15.0-1080.87+fips1

ubuntu/linux-azure-fips<5.15.0-1083.92+fips1

5.15.0-1083.92+fips1

ubuntu/linux-fips<5.15.0-135.146+fips1

5.15.0-135.146+fips1

ubuntu/linux-gcp-fips<5.15.0-1079.88+fips1

5.15.0-1079.88+fips1

ubuntu/linux<6.8.0-58.60

6.8.0-58.60

ubuntu/linux-aws<6.8.0-1027.29

6.8.0-1027.29

ubuntu/linux-azure<6.8.0-1027.32

6.8.0-1027.32

ubuntu/linux-azure-6.11<6.11.0-1012.12~24.04.1

6.11.0-1012.12~24.04.1

ubuntu/linux-azure-nvidia<6.8.0-1014.15

6.8.0-1014.15

ubuntu/linux-gcp<6.8.0-1028.30

6.8.0-1028.30

ubuntu/linux-gcp-6.11<6.11.0-1011.11~24.04.1

6.11.0-1011.11~24.04.1

ubuntu/linux-gke<6.8.0-1023.27

6.8.0-1023.27

ubuntu/linux-gkeop<6.8.0-1010.12

6.8.0-1010.12

ubuntu/linux-ibm<6.8.0-1024.24

6.8.0-1024.24

ubuntu/linux-lowlatency<6.8.0-58.60.1

6.8.0-58.60.1

ubuntu/linux-nvidia<6.8.0-1026.29

6.8.0-1026.29

ubuntu/linux-nvidia-6.11<6.11.0-1007.7

6.11.0-1007.7

ubuntu/linux-nvidia-lowlatency<6.8.0-1026.29.1

6.8.0-1026.29.1

ubuntu/linux-nvidia-tegra<6.8.0-1008.8

6.8.0-1008.8

ubuntu/linux-oem-6.11<6.11.0-1015.15

6.11.0-1015.15

ubuntu/linux-oem-6.8<6.8.0-1026.26

6.8.0-1026.26

ubuntu/linux-oracle<6.8.0-1024.25

6.8.0-1024.25

ubuntu/linux-raspi<6.8.0-1028.32

6.8.0-1028.32

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv<6.8.0-58.60.1

6.8.0-58.60.1

ubuntu/linux-xilinx<6.8.0-1017.18

6.8.0-1017.18

ubuntu/linux-raspi-realtime<6.8.0-2023.24

6.8.0-2023.24

ubuntu/linux-realtime<6.8.1-1020.21

6.8.1-1020.21

ubuntu/linux-fips<6.8.0-78.78+fips1

6.8.0-78.78+fips1

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.1.123-1
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Fixed in 6.12.3-1
Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1142.152~18.04.1
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Fixed in 5.4.0-1147.154~18.04.1
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Fixed in 5.4.0-1145.154~18.04.1
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Fixed in 5.4.0-211.231~18.04.1
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Fixed in 5.4.0-1090.95~18.04.1
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Fixed in 5.4.0-1140.149~18.04.1
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Fixed in 5.4.0-1129.142~18.04.1
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Fixed in 5.4.0-211.231
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Fixed in 5.4.0-1142.152
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Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1080.87~20.04.1
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Fixed in 5.4.0-1147.154
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Fixed in 5.15.0-1086.95~20.04.1
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Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1101.108
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Fixed in 5.4.0-1145.154
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Fixed in 5.15.0-1081.90~20.04.1
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Fixed in 5.15.0-136.147~20.04.1
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Fixed in 5.4.0-1088.93
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Fixed in 5.15.0-1074.77~20.04.1
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Fixed in 5.15.0-1077.83~20.04.1
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Fixed in 5.4.0-1048.51
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Fixed in 5.4.0-1129.138
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Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-135.146~20.04.1
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Fixed in 5.4.0-1140.150
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Fixed in 5.15.0-1077.83~20.04.1
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Fixed in 5.4.0-1129.142
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Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1075.79~20.04.1
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Fixed in 5.4.0-1060.64
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Fixed in 5.15.0-1039.39~20.04.1
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Fixed in 5.4.0-1142.153+fips1
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Fixed in 5.4.0-1147.154+fips1
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Fixed in 5.4.0-1116.126
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Fixed in 5.4.0-1145.154+fips1
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Fixed in 5.15.0-135.146
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Fixed in 5.15.0-1080.87
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Fixed in 6.8.0-1027.29~22.04.1
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Fixed in 5.15.0-1084.93
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Fixed in 6.8.0-1027.32~22.04.1
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Fixed in 5.15.0-1084.93.1
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Fixed in 5.15.0-1079.88
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Fixed in 6.8.0-1028.30~22.04.1
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Fixed in 5.15.0-1077.83
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Fixed in 5.15.0-1062.70
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Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-58.60~22.04.1
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Fixed in 5.15.0-1072.75
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Fixed in 6.8.0-1024.24~22.04.1
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Fixed in 5.15.0-1073.75
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Fixed in 5.15.0-1075.81
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Fixed in 5.15.0-1076.81
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Fixed in 5.15.0-135.146
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Fixed in 6.8.0-58.60.1~22.04.1
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Fixed in 5.15.0-1074.75
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Fixed in 6.8.0-1026.29~22.04.1
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Fixed in 5.15.0-1033.33
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Fixed in 5.15.0-1021.21
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Fixed in 5.15.0-1077.83
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Fixed in 6.8.0-1024.25~22.04.1
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Fixed in 5.15.0-1074.77
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Fixed in 6.8.0-58.60.1~22.04.1
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Fixed in 5.15.0-1044.48
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Fixed in 5.15.0-1062.64
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Fixed in 5.15.0-1080.88
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Fixed in 6.8.1-1020.21~22.04.1
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Fixed in 5.15.0-1080.87+fips1
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Fixed in 5.15.0-1083.92+fips1
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Fixed in 5.15.0-135.146+fips1
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Fixed in 5.15.0-1079.88+fips1
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Fixed in 6.8.0-58.60
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Fixed in 6.8.0-1027.29
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Fixed in 6.8.0-1027.32
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Fixed in 6.11.0-1012.12~24.04.1
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Fixed in 6.8.0-1014.15
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Fixed in 6.8.0-1028.30
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Fixed in 6.11.0-1011.11~24.04.1
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Fixed in 6.8.0-1023.27
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Fixed in 6.8.0-1010.12
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Fixed in 6.8.0-1024.24
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Fixed in 6.8.0-58.60.1
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Fixed in 6.8.0-1026.29
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Fixed in 6.11.0-1007.7
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Fixed in 6.8.0-1026.29.1
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Fixed in 6.8.0-1008.8
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Fixed in 6.11.0-1015.15
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Fixed in 6.8.0-1026.26
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Fixed in 6.8.0-1024.25
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Fixed in 6.8.0-1028.32
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Fixed in 6.8.0-58.60.1
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Fixed in 6.8.0-1017.18
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Fixed in 6.8.0-2023.24
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Fixed in 6.8.1-1020.21
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Fixed in 6.8.0-78.78+fips1

Event History

Dec 29, 2024

CVE Published

via MITRE·11:30 AM

Data Sourced

via MITRE·11:30 AM

Description

Data Sourced

via Red Hat·12:02 PM

DescriptionSeverityAffected Software

Data Sourced

via OSV·12:15 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·12:15 PM

RemedyDescriptionSeverityWeaknessAffected Software

Jul 8, 2026

Data Sourced

via IBM·12:00 AM

DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

IBM-7279510

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2024-56739?

CVE-2024-56739 is considered a medium severity vulnerability due to potential exposure to uninitialized data.

How do I fix CVE-2024-56739?

To mitigate CVE-2024-56739, upgrade the Linux kernel to a version that addresses this vulnerability.

Which versions of the Linux kernel are affected by CVE-2024-56739?

CVE-2024-56739 affects Linux kernel versions from 2.6.38 up to 6.12.2.

What is the impacts of CVE-2024-56739?

The impact of CVE-2024-56739 may include the use of uninitialized data leading to unreliable or improper date and time readings.

Is there a workaround for CVE-2024-56739?

Currently, there are no recommended workarounds for CVE-2024-56739, so applying the patch is essential.

CVE-2024-56739: rtc: check if __rtc_read_time was successful in rtc_timer_do_work()

Other sources

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2024-56739?

How do I fix CVE-2024-56739?

Which versions of the Linux kernel are affected by CVE-2024-56739?

What is the impacts of CVE-2024-56739?

Is there a workaround for CVE-2024-56739?

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