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Fencer Vulns
medium 5.5

CVE-2021-47385 json

hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field

published 2024-05-21 2 y ago modified 2026-06-17 4 mo ago also EUVD-2021-34390

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

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 devm_i2c_new_dummy_device() in w83791d_detect_subclients().

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]

Patch / fix

  • Linux Linux 5.4.151, 5.10.71, 5.14.10, 5.15
  • linux Debian 14, Debian 13, Debian 12 5.14.12-1

debian advisories DEBIAN-CVE-2021-47385

  • linux Ubuntu 20.04 LTS 5.4.0-91.102
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1060.63
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1058.62
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1008.9
  • linux-kvm Ubuntu 20.04 LTS 5.4.0-1050.52
  • linux-azure Ubuntu 20.04 LTS 5.4.0-1064.67
  • linux-gkeop Ubuntu 20.04 LTS 5.4.0-1027.28
  • linux-raspi Ubuntu 20.04 LTS 5.4.0-1047.52

ubuntu advisories UBUNTU-CVE-2021-47385

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-427.40.1.el9_4
  • rv RHEL 9 5.14.0-427.40.1.el9_4
  • perf RHEL 9 5.14.0-427.40.1.el9_4
  • rtla RHEL 9 5.14.0-427.40.1.el9_4
  • bpftool RHEL 9 7.3.0-427.40.1.el9_4
  • libperf RHEL 9 5.14.0-427.40.1.el9_4
  • kernel-rt RHEL 9 5.14.0-427.40.1.el9_4
  • kernel-64k RHEL 9 5.14.0-427.40.1.el9_4

red hat advisories RHSA-2024:8158RHSA-2024:8157RHSA-2024:8162RHSA-2024:7000RHSA-2024:7001RHSA-2024:6206

  • dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-default SLE Workstation Extension 15 SP5, SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5 +4 more 5.14.21-150500.55.68.1
  • kernel-kvmsmall openSUSE Leap 15.5 5.14.21-150500.55.68.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.68.1

suse advisories SUSE-SU-2024:2190-1SUSE-SU-2024:2189-1SUSE-SU-2024:2019-1SUSE-SU-2024:2011-1SUSE-SU-2024:2008-1

  • kernel AlmaLinux 9 5.14.0-427.40.1.el9_4
  • rv AlmaLinux 9 5.14.0-427.40.1.el9_4
  • perf AlmaLinux 9 5.14.0-427.40.1.el9_4
  • rtla AlmaLinux 9 5.14.0-427.40.1.el9_4
  • bpftool AlmaLinux 9 7.3.0-427.40.1.el9_4
  • libperf AlmaLinux 9 5.14.0-427.40.1.el9_4
  • kernel-rt AlmaLinux 9 5.14.0-427.40.1.el9_4
  • kernel-64k AlmaLinux 9 5.14.0-427.40.1.el9_4

almalinux advisories ALSA-2024:8162ALSA-2024:7000ALSA-2024:7001

  • kernel Rocky Linux 8 4.18.0-553.22.1.el8_10
  • kernel Rocky Linux 9 5.14.0-427.40.1.el9_4
  • kernel-rt Rocky Linux 8 4.18.0-553.22.1.rt7.363.el8_10

rocky linux advisories RLSA-2024:7000RLSA-2024:8162RLSA-2024:7001

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-47385 updated cvss 4.4

kernel: hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.”
  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.70.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.70.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.70.1.el8_8
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:6206
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.88.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.88.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.88.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.88.1.el9_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8157
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.40.1.el9_4, perf 5.14.0-427.40.1.el9_4, rtla 5.14.0-427.40.1.el9_4, kernel-devel-matched 5.14.0-427.40.1.el9_4, kernel-64k-devel-matched 5.14.0-427.40.1.el9_4, kernel-debug-devel-matched 5.14.0-427.40.1.el9_4, +6 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8162
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.88.1.el9_2, rtla 5.14.0-284.88.1.el9_2, kernel-devel-matched 5.14.0-284.88.1.el9_2, kernel-64k-devel-matched 5.14.0-284.88.1.el9_2, kernel-debug-devel-matched 5.14.0-284.88.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.88.1.el9_2, +5 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8157
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.22.1.el8_10, kernel 4.18.0-553.22.1.el8_10, bpftool 4.18.0-553.22.1.el8_10, kernel-core 4.18.0-553.22.1.el8_10, kernel-tools 4.18.0-553.22.1.el8_10, python3-perf 4.18.0-553.22.1.el8_10, +15 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:7000
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.40.1.el9_4, kernel 5.14.0-427.40.1.el9_4, kernel-64k 5.14.0-427.40.1.el9_4, kernel-core 5.14.0-427.40.1.el9_4, kernel-tools 5.14.0-427.40.1.el9_4, python3-perf 5.14.0-427.40.1.el9_4, +28 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8162
show 13 more
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.118.1.el8_6, kernel 4.18.0-372.118.1.el8_6, bpftool 4.18.0-372.118.1.el8_6, kernel-core 4.18.0-372.118.1.el8_6, kernel-tools 4.18.0-372.118.1.el8_6, python3-perf 4.18.0-372.118.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.118.1.el8_6, kernel 4.18.0-372.118.1.el8_6, bpftool 4.18.0-372.118.1.el8_6, kernel-core 4.18.0-372.118.1.el8_6, kernel-tools 4.18.0-372.118.1.el8_6, python3-perf 4.18.0-372.118.1.el8_6, +15 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:5281
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.70.1.el8_8, kernel 4.18.0-477.70.1.el8_8, bpftool 4.18.0-477.70.1.el8_8, kernel-core 4.18.0-477.70.1.el8_8, kernel-tools 4.18.0-477.70.1.el8_8, python3-perf 4.18.0-477.70.1.el8_8, +15 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:6206
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.88.1.el9_2, kernel 5.14.0-284.88.1.el9_2, kernel-64k 5.14.0-284.88.1.el9_2, kernel-core 5.14.0-284.88.1.el9_2, kernel-tools 5.14.0-284.88.1.el9_2, python3-perf 5.14.0-284.88.1.el9_2, +28 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8157
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.118.1.el8_6, kernel 4.18.0-372.118.1.el8_6, bpftool 4.18.0-372.118.1.el8_6, kernel-core 4.18.0-372.118.1.el8_6, kernel-tools 4.18.0-372.118.1.el8_6, python3-perf 4.18.0-372.118.1.el8_6, +8 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:5281
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.22.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.22.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.22.1.el8_10
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:7000
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.40.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.40.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.40.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.40.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.40.1.el9_4
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8162
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-kvm 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-core 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-modules 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-debug-kvm 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-debug-core 4.18.0-553.22.1.rt7.363.el8_10, +4 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:7001
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.40.1.el9_4, kernel-rt-kvm 5.14.0-427.40.1.el9_4, kernel-rt-core 5.14.0-427.40.1.el9_4, kernel-rt-modules 5.14.0-427.40.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.40.1.el9_4, kernel-rt-debug-core 5.14.0-427.40.1.el9_4, +6 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8162
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-core 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-modules 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-debug-core 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-modules-core 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-debug-modules 5.14.0-284.88.1.rt14.373.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-kvm 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-core 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-modules 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-debug-kvm 5.14.0-284.88.1.rt14.373.el9_2, kernel-rt-debug-core 5.14.0-284.88.1.rt14.373.el9_2, +6 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8158
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-core 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-modules 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-debug-core 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-debug-modules 4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-modules-extra 4.18.0-553.22.1.rt7.363.el8_10, +2 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:7001
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.40.1.el9_4, kernel-rt-core 5.14.0-427.40.1.el9_4, kernel-rt-modules 5.14.0-427.40.1.el9_4, kernel-rt-debug-core 5.14.0-427.40.1.el9_4, kernel-rt-modules-core 5.14.0-427.40.1.el9_4, kernel-rt-debug-modules 5.14.0-427.40.1.el9_4, +4 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2024:8162
  • Red Hat OpenShift AI 8 rhoai/odh-rhel8-operator v2.13.1-2, rhoai/odh-dashboard-rhel8 v2.13.1-1, rhoai/odh-modelmesh-rhel8 v2.13.1-1, rhoai/odh-operator-bundle v2.13.1-2, rhoai/odh-rhel8-operator v2.14.0-24, rhoai/odh-dashboard-rhel8 v2.14.0-11, +56 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHBA-2024:8413
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.88.1.el9_2 Red Hat Enterprise Linux BaseOS AUS (v.8.6) kernel-headers 4.18.0-372.118.1.el8_6, kernel-cross-headers 4.18.0-372.118.1.el8_6 Red Hat Enterprise Linux BaseOS E4S (v.8.6) kernel-headers 4.18.0-372.118.1.el8_6, kernel-cross-headers 4.18.0-372.118.1.el8_6 Red Hat Enterprise Linux BaseOS TUS (v.8.6) kernel-headers 4.18.0-372.118.1.el8_6, kernel-cross-headers 4.18.0-372.118.1.el8_6
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.