UBUNTU-CVE-2021-47385: Null Pointer Dereference

Q: Who can exploit this issue?

The reported vector is local and requires low privileges. The impact is denial of service through a NULL pointer dereference; no confidentiality or integrity impact is listed.

Q: What conditions are required to trigger the crash?

The affected hardware-monitoring driver must read a device value where bit 3 is set, bit 7 is clear, and the low three bits equal bits 4 through 6. The description expresses this as a value matching the pattern 0b0xyz1xyz.

Q: Which Ubuntu kernel package families are listed as affected?

The listed packages are ubuntu/linux-hwe-edge, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-riscv, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, ubuntu/linux-fips, and ubuntu/linux-gcp-fips.

Published May 21, 2024

Updated

In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devmi2cnewdummydevice() in w83791ddetectsubclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multipline alignment]

Affected Software

91 affected componentsFixes available

ubuntu/linux-hwe-edge*

ubuntu/linux-aws-5.4<5.4.0-1060.63~18.04.1

5.4.0-1060.63~18.04.1

ubuntu/linux-azure-5.4<5.4.0-1064.67~18.04.1

5.4.0-1064.67~18.04.1

ubuntu/linux-gcp-5.4<5.4.0-1058.62~18.04.1

5.4.0-1058.62~18.04.1

ubuntu/linux-hwe-5.4<5.4.0-91.102~18.04.1

5.4.0-91.102~18.04.1

ubuntu/linux-oracle-5.4<5.4.0-1058.62~18.04.1

5.4.0-1058.62~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1047.52~18.04.1

5.4.0-1047.52~18.04.1

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux<5.4.0-91.102

5.4.0-91.102

ubuntu/linux-aws<5.4.0-1060.63

5.4.0-1060.63

ubuntu/linux-azure<5.4.0-1064.67

5.4.0-1064.67

ubuntu/linux-bluefield<5.4.0-1022.25

5.4.0-1022.25

ubuntu/linux-gcp<5.4.0-1058.62

5.4.0-1058.62

ubuntu/linux-gkeop<5.4.0-1027.28

5.4.0-1027.28

ubuntu/linux-ibm<5.4.0-1008.9

5.4.0-1008.9

ubuntu/linux-kvm<5.4.0-1050.52

5.4.0-1050.52

ubuntu/linux-oracle<5.4.0-1058.62

5.4.0-1058.62

ubuntu/linux-raspi<5.4.0-1047.52

5.4.0-1047.52

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-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

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<5.4.0-1069.73+fips2

5.4.0-1069.73+fips2

ubuntu/linux-azure-fips<5.4.0-1073.76+fips1

5.4.0-1073.76+fips1

ubuntu/linux-fips<5.4.0-1037.43

5.4.0-1037.43

ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1

5.4.0-1067.71~20.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-nvidia-6.2*

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-raspi-realtime*

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1060.63~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1064.67~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1058.62~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-91.102~18.04.1
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1058.62~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1047.52~18.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-91.102
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1060.63
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1064.67
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1022.25
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1058.62
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.4.0-1027.28
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1008.9
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1050.52
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1058.62
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1047.52
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1069.73+fips2
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1073.76+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1037.43
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1067.71~20.04.1

Event History

May 21, 2024

CVE Published

via OSV·03:15 PM

Data Sourced

via OSV·03:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Who can exploit this issue?

The reported vector is local and requires low privileges. The impact is denial of service through a NULL pointer dereference; no confidentiality or integrity impact is listed.

What conditions are required to trigger the crash?

The affected hardware-monitoring driver must read a device value where bit 3 is set, bit 7 is clear, and the low three bits equal bits 4 through 6. The description expresses this as a value matching the pattern 0b0xyz1xyz.

Which Ubuntu kernel package families are listed as affected?

The listed packages are ubuntu/linux-hwe-edge, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-riscv, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, ubuntu/linux-fips, and ubuntu/linux-gcp-fips.

UBUNTU-CVE-2021-47385: Null Pointer Dereference

Affected Software

Remediation

Event History

Frequently Asked Questions

Who can exploit this issue?

What conditions are required to trigger the crash?

Which Ubuntu kernel package families are listed as affected?

Company

Resources

Contact

Frequently Asked Questions

Who can exploit this issue?

What conditions are required to trigger the crash?

Which Ubuntu kernel package families are listed as affected?