VulnerabilityPublished 6 Oct 2026Updated 30 Oct 2026

CVE-2026-98198: Linux kernel · hwmon: (pwm-fan) Stop RPM timer before freeing tach data

Source GCVE Database

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Authoritative record:CVE-2026-98198· Medium

Not known to be exploited · fixed in d073d306e587c1f35aaf9c07c42e54a3d5895d8f : update Linux kernel when convenient.

Data as of 30 Oct 2026, 17:18 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in d073d306e587c1f35aaf9c07c42e54a3d5895d8f, b48339b0a577783e4590a69e4cd2f2760ce33154, a5ce3fe5335a24d0220958c6866830a6d5fa1cc0 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-vr2q-55hv-76j4

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 01695410d4529e38fea6159fa9f1260c598290b0, < d073d306e587c1f35aaf9c07c42e54a3d5895d8f	Fixed in d073d306e587c1f35aaf9c07c42e54a3d5895d8f
LinuxLinux	Affected ≥ 01695410d4529e38fea6159fa9f1260c598290b0, < b48339b0a577783e4590a69e4cd2f2760ce33154	Fixed in b48339b0a577783e4590a69e4cd2f2760ce33154
LinuxLinux	Affected ≥ 01695410d4529e38fea6159fa9f1260c598290b0, < a5ce3fe5335a24d0220958c6866830a6d5fa1cc0	Fixed in a5ce3fe5335a24d0220958c6866830a6d5fa1cc0
LinuxLinux	Affected ≥ 01695410d4529e38fea6159fa9f1260c598290b0, < 7743183d8b0f6ba88738805c824a255baae674b9	Fixed in 7743183d8b0f6ba88738805c824a255baae674b9
LinuxLinux	Affected ≥ 01695410d4529e38fea6159fa9f1260c598290b0, < 26d5ff79768548efb1e604bb6e8697c101e06269	Fixed in 26d5ff79768548efb1e604bb6e8697c101e06269
LinuxLinux	Affected ≥ 01695410d4529e38fea6159fa9f1260c598290b0, < 6f890d1fe8325ac8330473428b9a9d6526de1b32	Fixed in 6f890d1fe8325ac8330473428b9a9d6526de1b32

AI-suggested

A fix has been implemented in the Linux kernel that ensures the RPM timer is stopped before freeing tachometer data, preventing use-after-free access. Users should update to the fixed kernel version once available. No additional mitigation is required beyond applying the official patch.

Description

A use-after-free vulnerability in the Linux kernel's hwmon pwm-fan driver was addressed by ensuring the RPM timer is stopped before freeing tachometer data. The issue involved the timer potentially accessing freed memory during driver detach, causing kernel memory errors detected by KASAN. The fix reorders resource cleanup to retire the timer before releasing its backing data, preventing invalid memory access.

References

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