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NVD / CVE Program· CNA Linux

CVE-2021-47098: hwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 55840b9eae5367b5d5b29619dc2fb7e4596dba46, d105f30bea9104c590a9e5b495cb8a49bdfe405f.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 55840b9eae5367b5d5b29619dc2fb7e4596dba46, d105f30bea9104c590a9e5b495cb8a49bdfe405f or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations Commit b50aa49638c7 ("hwmon: (lm90) Prevent integer underflows of temperature calculations") addressed a number of underflow situations when writing temperature limits. However, it missed one situation, seen when an attempt is made to set the hysteresis value to MAX_LONG and the critical temperature limit is negative. Use clamp_val() when setting the hysteresis temperature to ensure that the provided value can never overflow or underflow.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Mar 4, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 12th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.14 and later · before 5.15.2
  • linux linux kernel5.16

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.14affected
    • b50aa49638c7e12abf4ecc483f4e928c5cccc1b0 and later · before d105f30bea9104c590a9e5b495cb8a49bdfe405faffected · git
    • b50aa49638c7e12abf4ecc483f4e928c5cccc1b0 and later · before 55840b9eae5367b5d5b29619dc2fb7e4596dba46affected · git
    • before 5.14not affected · semver
    • 5.15.12 and later · up to and including 5.15.*not affected · semver
    • 5.16 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.15.15-15.15.15-1
openSUSE:Leap 15.5dtb-aarch64before 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-64kbbefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-azurebefore 5.14.21-150500.33.48.15.14.21-150500.33.48.1
openSUSE:Leap 15.5kernel-debugbefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-defaultbefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-default-basebefore 5.14.21-150500.55.59.1.150500.6.25.75.14.21-150500.55.59.1.150500.6.25.7
openSUSE:Leap 15.5kernel-docsbefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-kvmsmallbefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-obs-buildbefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-obs-qabefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-rtbefore 5.14.21-150500.13.47.15.14.21-150500.13.47.1
openSUSE:Leap 15.5kernel-rt_debugbefore 5.14.21-150500.13.47.15.14.21-150500.13.47.1
openSUSE:Leap 15.5kernel-sourcebefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-source-azurebefore 5.14.21-150500.33.48.15.14.21-150500.33.48.1
openSUSE:Leap 15.5kernel-source-rtbefore 5.14.21-150500.13.47.15.14.21-150500.13.47.1
openSUSE:Leap 15.5kernel-symsbefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap 15.5kernel-syms-azurebefore 5.14.21-150500.33.48.15.14.21-150500.33.48.1
openSUSE:Leap 15.5kernel-syms-rtbefore 5.14.21-150500.13.47.15.14.21-150500.13.47.1
openSUSE:Leap 15.5kernel-zfcpdumpbefore 5.14.21-150500.55.59.15.14.21-150500.55.59.1
openSUSE:Leap Micro 5.3kernel-defaultbefore 5.14.21-150400.24.116.15.14.21-150400.24.116.1
openSUSE:Leap Micro 5.3kernel-default-basebefore 5.14.21-150400.24.116.1.150400.24.54.55.14.21-150400.24.116.1.150400.24.54.5
openSUSE:Leap Micro 5.3kernel-rtbefore 5.14.21-150400.15.76.15.14.21-150400.15.76.1
Red Hat:enterprise_linux:9::appstreambpftool-debuginfobefore 0:7.4.0-503.11.1.el9_50:7.4.0-503.11.1.el9_5

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-47096Mar 4, 2024 · ALSA: rawmidi - fix the uninitalized user_pversion
    16Monitor
  • ← EarlierCVE-2021-47097Mar 4, 2024 · Input: elantech - fix stack out of bound access in elantech_change_report_id()
    28Monitor
  • Later →CVE-2021-47099Mar 4, 2024 · veth: ensure skb entering GRO are not cloned.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux55840b9eae5367b5d5b29619dc2fb7e4596dba46Vendor (CNA)
Linux Linuxd105f30bea9104c590a9e5b495cb8a49bdfe405fVendor (CNA)
debian:linux5.15.15-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch645.14.21-150500.55.59.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-64kb5.14.21-150500.55.59.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-debug5.14.21-150500.55.59.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-default5.14.21-150400.24.116.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-default-base5.14.21-150400.24.116.1.150400.24.54.5 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-docs5.14.21-150500.55.59.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-kvmsmall5.14.21-150500.55.59.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-obs-build5.14.21-150500.55.59.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-rt5.14.21-150400.15.76.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-rt_debug5.14.21-150500.13.47.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-source-rt5.14.21-150500.13.47.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-syms-rt5.14.21-150500.13.47.1 · openSUSE:Leap 15.5Package registry (OSV)
red hat:bpftool-debuginfo0:7.4.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-503.11.1.el9_5 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
suse:kernel-64kb5.14.21-150400.24.116.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-default5.14.21-150400.24.116.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-default-base5.14.21-150400.24.116.1.150400.24.54.5 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)

+9

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-0179343 days apartA buffer overflow vulnerability was found in the Netfilter subsystem in the Linux Kernel.
    32Monitor
  • CVE-2024-2330739 days apartInteger overflow in raid5_cache_count in Linux kernel
    31Monitor
  • CVE-2024-40994130 days apartptp: fix integer overflow in max_vclocks_store
    31Monitor
  • CVE-2024-41000130 days apartblock/ioctl: prefer different overflow check
    31Monitor
  • CVE-2022-48837134 days apartusb: gadget: rndis: prevent integer overflow in rndis_set_response()
    31Monitor
  • CVE-2024-42136148 days apartcdrom: rearrange last_media_change check to avoid unintentional overflow
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records