Unknown

CVE-2026-89892 — media: em28xx: defer audio-only extension registration

In the Linux kernel, the following vulnerability has been resolved: media: em28xx: defer audio-only extension registration The audio-only path registers extensions while probing the primary device. For a dual-TS board, this happens before dev_next is created. The duplicate device inherits is_audio_only and is then independently inserted into em28xx_devlist. The list is intended to contain only primary devices: extension operations reach the secondary device through dev_next. The independently linked secondary can be freed during disconnect while its list node remains reachable, resulting in a use-after-free. Defer audio-only extension registration to the module-request work item. It runs only after probing has completed construction of the optional secondary device, so only the primary is registered and extension callbacks reach the secondary through dev_next.

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

0.21%

ahead of 11% of scored CVEs · Oct 20, 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	≥ 4a089668ef22c295ed4997289cc48446c849249c and < 0da1e627f4fc9d0e947fdae90913042120878923≥ 4a089668ef22c295ed4997289cc48446c849249c and < f8d7e77d9c621b42a191c67a9b37bec23dc1d555≥ 4a089668ef22c295ed4997289cc48446c849249c and < 1abe9524dec0fd26e9ceb8d586034d6f68dd8273≥ 4a089668ef22c295ed4997289cc48446c849249c and < 4e11c45dfdc72ab656067b1df8fcebaf52fd4715≥ 4a089668ef22c295ed4997289cc48446c849249c and < d06067ee32620f272cfb80c7bc7c572ad4e74724≥ 4a089668ef22c295ed4997289cc48446c849249c and < f9322ac9f862961d7f377b87ec26c8565af7e073≥ 4a089668ef22c295ed4997289cc48446c849249c and < 4666197ca4f7d80cd3b0292054fe45d76be9ba04≥ 4a089668ef22c295ed4997289cc48446c849249c and < 95f76f51937fdfb0fc1e14cae606b1ef574a56f3 and 1 more version 4.17	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 20, 2026 · 5 reading(s) · max 0.21%

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

git.kernel.org/stable/c/f8d7e77d9c621b42a191c67a9b37bec23dc1d555
NIST National Vulnerability Database
git.kernel.org/stable/c/4666197ca4f7d80cd3b0292054fe45d76be9ba04
NIST National Vulnerability Database
git.kernel.org/stable/c/1abe9524dec0fd26e9ceb8d586034d6f68dd8273
NIST National Vulnerability Database
github.com/advisories/GHSA-gv4g-vvq5-j6r7
GitHub Security Advisories
git.kernel.org/stable/c/d06067ee32620f272cfb80c7bc7c572ad4e74724
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-89892
GitHub Security Advisories
git.kernel.org/stable/c/4e11c45dfdc72ab656067b1df8fcebaf52fd4715
NIST National Vulnerability Database
git.kernel.org/stable/c/f9322ac9f862961d7f377b87ec26c8565af7e073
NIST National Vulnerability Database
git.kernel.org/stable/c/95f76f51937fdfb0fc1e14cae606b1ef574a56f3
NIST National Vulnerability Database
git.kernel.org/stable/c/0da1e627f4fc9d0e947fdae90913042120878923
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 2d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 2d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 2d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 2d
Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 2d
Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 2d

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-2026-89892 is "media: em28xx: defer audio-only extension registration", 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 0.21% 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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