CVE-2026-89892Public exploitHinoki check available

Kernel crash via stale em28xx device-list entry

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in the Linux em28xx driver allows physically proximate attackers to crash the kernel by disconnecting a dual-TS USB board. The audio-only probe path registers a duplicate secondary device in em28xx_devlist before dev_next exists, leaving its list node reachable after the secondary is freed. Exploitation requires the affected USB media-device path and peripheral disconnect; syzbot reports denial of service as exploitable but unprivileged triggering as unavailable.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in the Linux em28xx driver allows physically proximate attackers to crash the kernel by disconnecting a dual-TS USB board. The audio-only probe path registers a duplicate secondary device in em28xx_devlist before dev_next exists, leaving its list node reachable after the secondary is freed. Exploitation requires the affected USB media-device path and peripheral disconnect; syzbot reports denial of service as exploitable but unprivileged triggering as unavailable.

The record

CVE
CVE-2026-89892
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.17
  2. Affected versionversion=4a089668ef22c295ed4997289cc48446c849249c <0da1e627f4fc9d0e947fdae90913042120878923
  3. Affected versionversion=4a089668ef22c295ed4997289cc48446c849249c <1abe9524dec0fd26e9ceb8d586034d6f68dd8273
  4. Affected versionversion=4a089668ef22c295ed4997289cc48446c849249c <4666197ca4f7d80cd3b0292054fe45d76be9ba04
  5. Affected versionversion=4a089668ef22c295ed4997289cc48446c849249c <4e11c45dfdc72ab656067b1df8fcebaf52fd4715
  6. Affected versionversion=4a089668ef22c295ed4997289cc48446c849249c <95f76f51937fdfb0fc1e14cae606b1ef574a56f3
  7. Affected versionversion=4a089668ef22c295ed4997289cc48446c849249c <d06067ee32620f272cfb80c7bc7c572ad4e74724
  8. Affected versionversion=4a089668ef22c295ed4997289cc48446c849249c <f8d7e77d9c621b42a191c67a9b37bec23dc1d555
  9. Affected versionversion=4a089668ef22c295ed4997289cc48446c849249c <f9322ac9f862961d7f377b87ec26c8565af7e073

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=4a089668ef22c295ed4997289cc48446c849249c <0da1e627f4fc9d0e947fdae90913042120878923; version=4a089668ef22c295ed4997289cc48446c849249c <1abe9524dec0fd26e9ceb8d586034d6f68dd8273; version=4a089668ef22c295ed4997289cc48446c849249c <4666197ca4f7d80cd3b0292054fe45d76be9ba04; version=4a089668ef22c295ed4997289cc48446c849249c <4e11c45dfdc72ab656067b1df8fcebaf52fd4715; version=4a089668ef22c295ed4997289cc48446c849249c <95f76f51937fdfb0fc1e14cae606b1ef574a56f3; version=4a089668ef22c295ed4997289cc48446c849249c <d06067ee32620f272cfb80c7bc7c572ad4e74724; version=4a089668ef22c295ed4997289cc48446c849249c <f8d7e77d9c621b42a191c67a9b37bec23dc1d555; version=4a089668ef22c295ed4997289cc48446c849249c <f9322ac9f862961d7f377b87ec26c8565af7e073

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1200Hardware Additions

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo