CVE-2025-38312: fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()

Q: What is the severity of CVE-2025-38312?

The severity of CVE-2025-38312 is considered to be medium due to potential denial of service risks associated with the division by zero condition.

Q: How do I fix CVE-2025-38312?

To fix CVE-2025-38312, update your Linux kernel to the latest version that includes the patch for this vulnerability.

Q: What versions of the Linux Kernel are affected by CVE-2025-38312?

CVE-2025-38312 affects various versions of the Linux Kernel prior to the patch being applied; it is best to refer to your specific kernel version for details.

Q: What components are involved in CVE-2025-38312?

CVE-2025-38312 involves the fbdev subsystem specifically the fb_cvt_hperiod() function, which leads to issues with framebuffer mode setting.

Q: Is CVE-2025-38312 a critical vulnerability?

CVE-2025-38312 is not classified as critical, but it can lead to unexpected behavior and should be mitigated promptly.

Published Jul 10, 2025

Updated

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

fbdev: core: fbcvt: avoid division by 0 in fbcvthperiod()

In fbfindmodecvt(), iff mode->refresh somehow happens to be 0x80000000, cvt.frefresh will become 0 when multiplying it by 2 due to overflow. It's then passed to fbcvthperiod(), where it's used as a divider -- division by 0 will result in kernel oops. Add a sanity check for cvt.frefresh to avoid such overflow...

Found by Linux Verification Center (linuxtesting.org) with the Svace static analysis tool.

Affected Software

243 affected componentsFixes available

Linux Kernel

Linux Linux kernel>=2.6.14<5.4.295

Linux Linux kernel>=5.5<5.10.239

Linux Linux kernel>=5.11<5.15.186

Linux Linux kernel>=5.16<6.1.142

Linux Linux kernel>=6.2<6.6.94

Linux Linux kernel>=6.7<6.12.34

Linux Linux kernel>=6.13<6.15.3

Debian Debian Linux=11.0

debian/linux<6.1.147-1

6.1.147-1

debian/linux<6.12.35-1

6.12.35-1

debian/linux<6.12.35-1

6.12.35-1

linux/kernel>=2.6.14<5.4.295

5.4.295

linux/kernel>=5.5.0<5.10.239

5.10.239

linux/kernel>=5.11.0<5.15.186

5.15.186

linux/kernel>=5.16.0<6.1.142

6.1.142

linux/kernel>=6.2.0<6.6.94

6.6.94

linux/kernel>=6.7.0<6.12.34

6.12.34

linux/kernel>=6.13.0<6.15.3

6.15.3

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*

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4*

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4*

ubuntu/linux-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4*

ubuntu/linux-raspi-5.4*

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*

ubuntu/linux-aws*

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1092.99~20.04.1

5.15.0-1092.99~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1096.105~20.04.1

5.15.0-1096.105~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-bluefield*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1092.101~20.04.1

5.15.0-1092.101~20.04.1

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-5.15<5.15.0-156.166~20.04.1

5.15.0-156.166~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm*

ubuntu/linux-ibm-5.15<5.15.0-1086.89~20.04.1

5.15.0-1086.89~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1087.93~20.04.1

5.15.0-1087.93~20.04.1

ubuntu/linux-iot*

ubuntu/linux-kvm*

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-156.166~20.04.1

5.15.0-156.166~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1045.45~20.04.1

5.15.0-1045.45~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1090.96~20.04.1

5.15.0-1090.96~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1087.91~20.04.1

5.15.0-1087.91~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp*

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<5.15.0-156.166

5.15.0-156.166

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1092.99

5.15.0-1092.99

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1046.49~22.04.1

6.8.0-1046.49~22.04.1

ubuntu/linux-azure<5.15.0-1096.105

5.15.0-1096.105

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1051.57~22.04.1

6.8.0-1051.57~22.04.1

ubuntu/linux-azure-fde<5.15.0-1096.105.1

5.15.0-1096.105.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1046.53~22.04.1

6.8.0-1046.53~22.04.1

ubuntu/linux-gcp<5.15.0-1092.101

5.15.0-1092.101

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1047.50~22.04.2

6.8.0-1047.50~22.04.2

ubuntu/linux-gke<5.15.0-1089.95

5.15.0-1089.95

ubuntu/linux-gkeop<5.15.0-1075.83

5.15.0-1075.83

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-100.100~22.04.1

6.8.0-100.100~22.04.1

ubuntu/linux-ibm<5.15.0-1086.89

5.15.0-1086.89

ubuntu/linux-ibm-6.8<6.8.0-1044.44~22.04.1

6.8.0-1044.44~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1087.93

5.15.0-1087.93

ubuntu/linux-kvm<5.15.0-1088.93

5.15.0-1088.93

ubuntu/linux-lowlatency<5.15.0-156.166

5.15.0-156.166

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-100.100.1~22.04.1

6.8.0-100.100.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1087.88

5.15.0-1087.88

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1046.49~22.04.1

6.8.0-1046.49~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1045.45

5.15.0-1045.45

ubuntu/linux-nvidia-tegra-igx<5.15.0-1034.34

5.15.0-1034.34

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1090.96

5.15.0-1090.96

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1043.44~22.04.1

6.8.0-1043.44~22.04.1

ubuntu/linux-raspi<5.15.0-1086.89

5.15.0-1086.89

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-100.100~22.04.1

6.8.0-100.100~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1056.60

5.15.0-1056.60

ubuntu/linux-bluefield<5.15.0-1076.78

5.15.0-1076.78

ubuntu/linux-intel-iot-realtime<5.15.0-1085.87

5.15.0-1085.87

ubuntu/linux-realtime<5.15.0-1092.101

5.15.0-1092.101

ubuntu/linux-realtime-6.8<6.8.1-1041.42~22.04.1

6.8.1-1041.42~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1092.99+fips1

5.15.0-1092.99+fips1

ubuntu/linux-azure-fips<5.15.0-1096.105+fips1

5.15.0-1096.105+fips1

ubuntu/linux-fips<5.15.0-156.166+fips1

5.15.0-156.166+fips1

ubuntu/linux-gcp-fips<5.15.0-1092.101+fips1

5.15.0-1092.101+fips1

ubuntu/linux<6.8.0-100.100

6.8.0-100.100

ubuntu/linux-aws<6.8.0-1046.49

6.8.0-1046.49

ubuntu/linux-aws-6.14<6.14.0-1013.13~24.04.1

6.14.0-1013.13~24.04.1

ubuntu/linux-azure<6.8.0-1046.52

6.8.0-1046.52

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-fde<6.8.0-1046.53

6.8.0-1046.53

ubuntu/linux-azure-nvidia<6.8.0-1039.42

6.8.0-1039.42

ubuntu/linux-azure-nvidia-6.14<6.14.0-1007.7

6.14.0-1007.7

ubuntu/linux-gcp<6.8.0-1047.50

6.8.0-1047.50

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14<6.14.0-1016.17~24.04.1

6.14.0-1016.17~24.04.1

ubuntu/linux-gke<6.8.0-1043.48

6.8.0-1043.48

ubuntu/linux-gkeop<6.8.0-1030.33

6.8.0-1030.33

ubuntu/linux-hwe-6.11*

ubuntu/linux-ibm<6.8.0-1044.44

6.8.0-1044.44

ubuntu/linux-intel*

ubuntu/linux-lowlatency<6.8.0-100.100.1

6.8.0-100.100.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1046.49

6.8.0-1046.49

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-lowlatency<6.8.0-1046.49.1

6.8.0-1046.49.1

ubuntu/linux-nvidia-tegra<6.8.0-1020.20

6.8.0-1020.20

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14<6.14.0-1012.12

6.14.0-1012.12

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1043.44

6.8.0-1043.44

ubuntu/linux-oracle-6.14<6.14.0-1013.13~24.04.1

6.14.0-1013.13~24.04.1

ubuntu/linux-raspi<6.8.0-1047.51

6.8.0-1047.51

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14<6.14.0-32.32.1~24.04.1

6.14.0-32.32.1~24.04.1

ubuntu/linux-xilinx<6.8.0-1023.24

6.8.0-1023.24

ubuntu/linux-bluefield<6.8.0-1016.20

6.8.0-1016.20

ubuntu/linux-raspi-realtime<6.8.0-2037.38

6.8.0-2037.38

ubuntu/linux-realtime<6.8.1-1041.42

6.8.1-1041.42

ubuntu/linux-realtime-6.14<6.14.0-1012.12~24.04.1

6.14.0-1012.12~24.04.1

ubuntu/linux-aws-fips<6.8.0-1046.49+fips1

6.8.0-1046.49+fips1

ubuntu/linux-azure-fips<6.8.0-1046.52+fips1

6.8.0-1046.52+fips1

ubuntu/linux-fips<6.8.0-100.100+fips1

6.8.0-100.100+fips1

ubuntu/linux-gcp-fips<6.8.0-1047.50+fips1

6.8.0-1047.50+fips1

ubuntu/linux-azure-fde*

ubuntu/linux-vmware*

debian/linux

6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.1.147-1
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Fixed in 6.12.35-1
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Fixed in 5.4.295
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Fixed in 5.10.239
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Fixed in 5.15.186
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Fixed in 6.1.142
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Fixed in 6.6.94
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Fixed in 6.12.34
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Fixed in 6.15.3
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Fixed in 5.15.0-1092.99~20.04.1
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Fixed in 5.15.0-1096.105~20.04.1
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Fixed in 5.15.0-1092.101~20.04.1
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Fixed in 5.15.0-156.166~20.04.1
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Fixed in 5.15.0-1086.89~20.04.1
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Fixed in 5.15.0-1087.93~20.04.1
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Fixed in 5.15.0-156.166~20.04.1
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Fixed in 5.15.0-1045.45~20.04.1
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Fixed in 5.15.0-1090.96~20.04.1
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Fixed in 5.15.0-1087.91~20.04.1
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Fixed in 5.15.0-156.166
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Fixed in 5.15.0-1092.99
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Fixed in 6.8.0-1046.49~22.04.1
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Fixed in 5.15.0-1096.105
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Fixed in 6.8.0-1051.57~22.04.1
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Fixed in 5.15.0-1096.105.1
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Fixed in 6.8.0-1046.53~22.04.1
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Fixed in 5.15.0-1092.101
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Fixed in 6.8.0-1047.50~22.04.2
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Fixed in 5.15.0-1089.95
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Fixed in 5.15.0-1075.83
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Fixed in 6.8.0-100.100~22.04.1
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Fixed in 5.15.0-1086.89
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Fixed in 6.8.0-1044.44~22.04.1
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Fixed in 5.15.0-1087.93
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Fixed in 5.15.0-1088.93
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Fixed in 5.15.0-156.166
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Fixed in 6.8.0-100.100.1~22.04.1
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Fixed in 5.15.0-1087.88
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Fixed in 6.8.0-1046.49~22.04.1
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Fixed in 5.15.0-1045.45
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Fixed in 5.15.0-1034.34
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Fixed in 5.15.0-1090.96
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Fixed in 6.8.0-1043.44~22.04.1
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Fixed in 5.15.0-1086.89
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Fixed in 6.8.0-100.100~22.04.1
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Fixed in 5.15.0-1056.60
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Fixed in 5.15.0-1076.78
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Fixed in 5.15.0-1085.87
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Fixed in 5.15.0-1092.101
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Fixed in 6.8.1-1041.42~22.04.1
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Fixed in 5.15.0-1092.99+fips1
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Fixed in 5.15.0-1096.105+fips1
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Fixed in 5.15.0-156.166+fips1
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Fixed in 5.15.0-1092.101+fips1
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Fixed in 6.8.0-100.100
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Fixed in 6.8.0-1046.49
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Fixed in 6.14.0-1013.13~24.04.1
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Fixed in 6.8.0-1046.52
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Fixed in 6.8.0-1046.53
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Fixed in 6.8.0-1039.42
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Fixed in 6.14.0-1007.7
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Fixed in 6.8.0-1047.50
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Fixed in 6.14.0-1016.17~24.04.1
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Fixed in 6.8.0-1043.48
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Fixed in 6.8.0-1030.33
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Fixed in 6.8.0-1044.44
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Fixed in 6.8.0-100.100.1
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Fixed in 6.8.0-1046.49
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Fixed in 6.8.0-1046.49.1
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Fixed in 6.8.0-1020.20
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Fixed in 6.14.0-1012.12
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Fixed in 6.8.0-1043.44
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Fixed in 6.14.0-1013.13~24.04.1
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Fixed in 6.8.0-1047.51
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Fixed in 6.14.0-32.32.1~24.04.1
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Fixed in 6.8.0-1023.24
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Fixed in 6.8.0-1016.20
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Fixed in 6.8.0-2037.38
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Fixed in 6.8.1-1041.42
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Fixed in 6.14.0-1012.12~24.04.1
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Fixed in 6.8.0-1046.49+fips1
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Fixed in 6.8.0-1046.52+fips1
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Fixed in 6.8.0-100.100+fips1
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Fixed in 6.8.0-1047.50+fips1
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Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.4-1
Compensating control
In fb_find_mode_cvt(), add a sanity check for cvt.f_refresh to prevent 0x80000000 from overflowing to 0 when multiplied by 2 before it is passed as the divisor to fb_cvt_hperiod().

Event History

Jul 10, 2025

CVE Published

via MITRE·07:42 AM

Data Sourced

via MITRE·07:42 AM

Description

Data Sourced

via OSV·07:42 AM

DescriptionAffected Software

Data Sourced

via NVD·08:15 AM

RemedyDescriptionSeverityWeaknessAffected Software

Nov 11, 2026

Data Sourced

via OSV·09:38 AM

Severity

Parent advisories

This vulnerability appears in the following advisories.

DSA-5973

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2025-38312?

The severity of CVE-2025-38312 is considered to be medium due to potential denial of service risks associated with the division by zero condition.

How do I fix CVE-2025-38312?

To fix CVE-2025-38312, update your Linux kernel to the latest version that includes the patch for this vulnerability.

What versions of the Linux Kernel are affected by CVE-2025-38312?

CVE-2025-38312 affects various versions of the Linux Kernel prior to the patch being applied; it is best to refer to your specific kernel version for details.

What components are involved in CVE-2025-38312?

CVE-2025-38312 involves the fbdev subsystem specifically the fb_cvt_hperiod() function, which leads to issues with framebuffer mode setting.

Is CVE-2025-38312 a critical vulnerability?

CVE-2025-38312 is not classified as critical, but it can lead to unexpected behavior and should be mitigated promptly.

CVE-2025-38312: fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2025-38312?

How do I fix CVE-2025-38312?

What versions of the Linux Kernel are affected by CVE-2025-38312?

What components are involved in CVE-2025-38312?

Is CVE-2025-38312 a critical vulnerability?

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