Unknown

CVE-2026-89891 — media: em28xx: fix use-after-free of dev_next->devlist on disconnect

In the Linux kernel, the following vulnerability has been resolved: media: em28xx: fix use-after-free of dev_next->devlist on disconnect When a device with has_dual_ts=1 is probed and the is_audio_only path is taken, both dev and dev->dev_next are added to the global em28xx_devlist via em28xx_init_extension(). However, during disconnect, em28xx_close_extension(dev) only calls list_del(&dev->devlist), leaving dev->dev_next->devlist still linked in the global list. When dev_next is subsequently freed via kref_put(), its devlist entry becomes a dangling pointer in em28xx_devlist. The next device probe that calls em28xx_init_extension() triggers a list corruption BUG when list_add_tail detects the freed node. This bug was exposed by commit a368ecde8a50 ("USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor") which clears reserved bits in bEndpointAddress during endpoint parsing. This causes fuzzed endpoint addresses like 0xf3 to be normalized to 0x83, which em28xx interprets as a vendor audio endpoint, enabling the is_audio_only + has_dual_ts code path that was previously unreachable with such descriptors. Fix this by removing dev->dev_next->devlist from the global list in em28xx_close_extension() before the device is freed.

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	≥ f410b4093fdd4d8f4644d3d486afe3040eceef7b and < f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18≥ f410b4093fdd4d8f4644d3d486afe3040eceef7b and < 1ed575b1991f68569eb589b7747d3bc26aa6a8a2≥ f410b4093fdd4d8f4644d3d486afe3040eceef7b and < da4b07da6281e39ce4c01e1227e036f3bf600e14≥ f410b4093fdd4d8f4644d3d486afe3040eceef7b and < 20aacd87550be297dc39a3f9532dcfff91586510≥ f410b4093fdd4d8f4644d3d486afe3040eceef7b and < 20c2c65f3d9f7c278dc9750531d3201ac8bf78b7≥ f410b4093fdd4d8f4644d3d486afe3040eceef7b and < 0782807552b6aff41b4656c6c9076a3231d3e79d≥ f410b4093fdd4d8f4644d3d486afe3040eceef7b and < 16cb1ee17e093175b4d9ae33202f68e5b108cca2≥ f410b4093fdd4d8f4644d3d486afe3040eceef7b and < 826915b6b65e2d3251e7248ea54289a22d748c84 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/0782807552b6aff41b4656c6c9076a3231d3e79d
NIST National Vulnerability Database
git.kernel.org/stable/c/826915b6b65e2d3251e7248ea54289a22d748c84
NIST National Vulnerability Database
git.kernel.org/stable/c/16cb1ee17e093175b4d9ae33202f68e5b108cca2
NIST National Vulnerability Database
git.kernel.org/stable/c/20aacd87550be297dc39a3f9532dcfff91586510
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-89891
GitHub Security Advisories
git.kernel.org/stable/c/da4b07da6281e39ce4c01e1227e036f3bf600e14
NIST National Vulnerability Database
git.kernel.org/stable/c/1ed575b1991f68569eb589b7747d3bc26aa6a8a2
NIST National Vulnerability Database
git.kernel.org/stable/c/20c2c65f3d9f7c278dc9750531d3201ac8bf78b7
NIST National Vulnerability Database
git.kernel.org/stable/c/f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18
NIST National Vulnerability Database
github.com/advisories/GHSA-5cx6-377w-hc5f
GitHub Security Advisories

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98869 bpf: Infer zext_dst based on static register liveness analysis 1h
Unknown CVE-2023-7356 Bluetooth: ISO: Copy BASE if service data matches EIR_BAA_SERVICE_UUID 1h
Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 3d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 3d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 3d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 3d

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-2026-89891 is "media: em28xx: fix use-after-free of dev_next->devlist on disconnect", 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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