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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98197: hwmon: (w83791d) remove fan/pwm 4-5 sysfs group on remove

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 081e3a78453635fb370b1712809d2af29e60b4c5, 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8, 2c381e6e0f033f2df13bd64905e7232c42f49009; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 081e3a78453635fb370b1712809d2af29e60b4c5, 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8, 2c381e6e0f033f2df13bd64905e7232c42f49009; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: (w83791d) remove fan/pwm 4-5 sysfs group on remove When the fan/pwm 4-5 pins are not used as GPIO, w83791d_probe() creates the w83791d_group_fanpwm45 sysfs group on the I2C client device. The probe error path removes this group when a later initialization step fails, but the normal remove path only removes w83791d_group. As a result, the optional fan/pwm 4-5 sysfs files can remain after the driver is unbound. The callbacks associated with these files access the driver data, which is devm allocated and released after driver unbind. Leaving the sysfs files behind can therefore result in accesses to stale driver data. Remove w83791d_group_fanpwm45 during normal teardown as well. This issue was found by manual code inspection.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 1th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.0
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • 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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  • when EPSS rises 20 points in a week

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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.

—

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

    • 2.6.28affected
    • 6e1ecd9b8f1358ed4d099f0c54434240dc40debe and later · before 081e3a78453635fb370b1712809d2af29e60b4c5affected · git
    • 6e1ecd9b8f1358ed4d099f0c54434240dc40debe and later · before b1d419eb3bc41245c3d3d99dfe1a7b6c45989586affected · git
    • 6e1ecd9b8f1358ed4d099f0c54434240dc40debe and later · before 2ccf6c512290a288a2d4d7f076430dfb0c6ee476affected · git
    • 6e1ecd9b8f1358ed4d099f0c54434240dc40debe and later · before f6e2ab72f32d16d71a2549c7ea062dd209f71670affected · git
    • 6e1ecd9b8f1358ed4d099f0c54434240dc40debe and later · before 2dd37d00f1f1af8e02ffa70ee573c10fd1a76864affected · git
    • 6e1ecd9b8f1358ed4d099f0c54434240dc40debe and later · before 2c381e6e0f033f2df13bd64905e7232c42f49009affected · git
    • 6e1ecd9b8f1358ed4d099f0c54434240dc40debe and later · before 583e04e88e75b8d57304015d83c38e82a9531600affected · git
    • 6e1ecd9b8f1358ed4d099f0c54434240dc40debe and later · before 0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8affected · git
    • before 2.6.28not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98195Oct 6, 2026 · wifi: iwlegacy: fix broadcast stations deallocation
    0Monitor
  • ← EarlierCVE-2026-98196Oct 6, 2026 · wifi: brcmsmac: fix UAF in brcms_free_timer()
    0Monitor
  • Later →CVE-2026-98198Oct 6, 2026 · hwmon: (pwm-fan) Stop RPM timer before freeing tach data
    0Monitor

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 Linux081e3a78453635fb370b1712809d2af29e60b4c5Vendor (CNA)
Linux Linux0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8Vendor (CNA)
Linux Linux2c381e6e0f033f2df13bd64905e7232c42f49009Vendor (CNA)
Linux Linux2ccf6c512290a288a2d4d7f076430dfb0c6ee476Vendor (CNA)
Linux Linux2dd37d00f1f1af8e02ffa70ee573c10fd1a76864Vendor (CNA)
Linux Linux583e04e88e75b8d57304015d83c38e82a9531600Vendor (CNA)
Linux Linuxb1d419eb3bc41245c3d3d99dfe1a7b6c45989586Vendor (CNA)
Linux Linuxf6e2ab72f32d16d71a2549c7ea062dd209f71670Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 8, 2026+33 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

No nightly-computed relations.

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).

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.
  • Special conditions such as timing or configuration are required.

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
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. CVSS— → 7
  2. Severity— → high
  3. Exploit maturity— → none
  4. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records