Unknown

CVE-2026-89936 — iio: dac: m62332: Fix regulator reference count imbalance

In the Linux kernel, the following vulnerability has been resolved: iio: dac: m62332: Fix regulator reference count imbalance m62332_set_value() enables the Vcc regulator on every write of a non-zero value and disables it on every write of zero, without tracking the channel's current state. Because the regulator is reference counted, changing a channel directly from one non-zero value to another enables it more than once, while a later write of zero disables it only once. The reference count never returns to zero and the regulator is left enabled indefinitely. Only enable the regulator on the transition from zero to non-zero, and only disable it on the transition from non-zero to zero, using the previously stored channel value to detect the edge. Balance the regulator on the I2C error path so the reference count stays consistent if the write fails.

Published Sep 16, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.22%

ahead of 11% of scored CVEs · Oct 19, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ b87b0c0f81e8d11c881b726b886b7502ab67d884 and < bac0ed8bee651aa841375edf72c6ab1d10ac80c6≥ b87b0c0f81e8d11c881b726b886b7502ab67d884 and < 9263b9ad968a563337a60e0eb66e35186e1faf9a≥ b87b0c0f81e8d11c881b726b886b7502ab67d884 and < 1d3a7d7dd3adee19e00be2b2237140f0fe169484≥ b87b0c0f81e8d11c881b726b886b7502ab67d884 and < f5acb824277a97a5210c454872202bf7f08c75d4≥ b87b0c0f81e8d11c881b726b886b7502ab67d884 and < ae18d2d2ef27a4d04fda6e30c23774513dc9be1e≥ b87b0c0f81e8d11c881b726b886b7502ab67d884 and < 08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9≥ b87b0c0f81e8d11c881b726b886b7502ab67d884 and < 9fe22f563b2a0fdb11fd3711a8c39c023629c08a≥ b87b0c0f81e8d11c881b726b886b7502ab67d884 and < a130404ce0b69ca1438126bd81c1985d3b4d2e6f and 1 more version 4.2	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 19, 2026 · 4 reading(s) · max 0.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 16, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

10 on the record

nvd.nist.gov/vuln/detail/CVE-2026-89936
GitHub Security Advisories
github.com/advisories/GHSA-93hj-782q-v32m
GitHub Security Advisories
git.kernel.org/stable/c/08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9
NIST National Vulnerability Database
git.kernel.org/stable/c/a130404ce0b69ca1438126bd81c1985d3b4d2e6f
NIST National Vulnerability Database
git.kernel.org/stable/c/bac0ed8bee651aa841375edf72c6ab1d10ac80c6
NIST National Vulnerability Database
git.kernel.org/stable/c/ae18d2d2ef27a4d04fda6e30c23774513dc9be1e
NIST National Vulnerability Database
git.kernel.org/stable/c/f5acb824277a97a5210c454872202bf7f08c75d4
NIST National Vulnerability Database
git.kernel.org/stable/c/9fe22f563b2a0fdb11fd3711a8c39c023629c08a
NIST National Vulnerability Database
git.kernel.org/stable/c/1d3a7d7dd3adee19e00be2b2237140f0fe169484
NIST National Vulnerability Database
git.kernel.org/stable/c/9263b9ad968a563337a60e0eb66e35186e1faf9a
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 1d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 1d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 1d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 1d
Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 1d
Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89936 is "iio: dac: m62332: Fix regulator reference count imbalance", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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