CVE-2026-89878Hinoki check available

Kernel out-of-bounds read via undersized firmware blob

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds read in the Linux s2255 USB media driver allows attackers to access invalid kernel memory through firmware under eight bytes. The s2255_probe() function subtracts eight from the unchecked blob length before reading the trailing marker and version, so a short length underflows the index. Reachability requires the driver to probe supported USB hardware and load an undersized firmware file; no data disclosure or code execution is reported.

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

Out-of-bounds read in the Linux s2255 USB media driver allows attackers to access invalid kernel memory through firmware under eight bytes. The s2255_probe() function subtracts eight from the unchecked blob length before reading the trailing marker and version, so a short length underflows the index. Reachability requires the driver to probe supported USB hardware and load an undersized firmware file; no data disclosure or code execution is reported.

The record

CVE
CVE-2026-89878
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

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=14d962602c8bf86e63c9b9272be1f0360d0a448a <330f2936ab768c7215322a476f033143e8891d28
  2. Affected versionversion=14d962602c8bf86e63c9b9272be1f0360d0a448a <342632a4d8ba3fafc1556deee0b7a48dd7860336
  3. Affected versionversion=14d962602c8bf86e63c9b9272be1f0360d0a448a <3e03f1209c1c8a45a7bc559f4ecd79d9b33f706d
  4. Affected versionversion=14d962602c8bf86e63c9b9272be1f0360d0a448a <5626785b0e4665326e4d96736c106161da09b2f0
  5. Affected versionversion=14d962602c8bf86e63c9b9272be1f0360d0a448a <6f6a5b0b0a84c2de0e152f2841e57bc226db924f
  6. Affected versionversion=14d962602c8bf86e63c9b9272be1f0360d0a448a <7d221859ba45d7228d0138c9a3e55bd3bb31e14e
  7. Affected versionversion=14d962602c8bf86e63c9b9272be1f0360d0a448a <8eca0f85eeb0789be40e637bcf9a21c4265b6c6f
  8. Affected versionversion=14d962602c8bf86e63c9b9272be1f0360d0a448a <ffc27411ea60b8a09f1fea3d664b65210fdeb454
  9. Affected versionversion=2.6.28

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=14d962602c8bf86e63c9b9272be1f0360d0a448a <330f2936ab768c7215322a476f033143e8891d28; version=14d962602c8bf86e63c9b9272be1f0360d0a448a <342632a4d8ba3fafc1556deee0b7a48dd7860336; version=14d962602c8bf86e63c9b9272be1f0360d0a448a <3e03f1209c1c8a45a7bc559f4ecd79d9b33f706d; version=14d962602c8bf86e63c9b9272be1f0360d0a448a <5626785b0e4665326e4d96736c106161da09b2f0; version=14d962602c8bf86e63c9b9272be1f0360d0a448a <6f6a5b0b0a84c2de0e152f2841e57bc226db924f; version=14d962602c8bf86e63c9b9272be1f0360d0a448a <7d221859ba45d7228d0138c9a3e55bd3bb31e14e; version=14d962602c8bf86e63c9b9272be1f0360d0a448a <8eca0f85eeb0789be40e637bcf9a21c4265b6c6f; version=14d962602c8bf86e63c9b9272be1f0360d0a448a <ffc27411ea60b8a09f1fea3d664b65210fdeb454; version=2.6.28

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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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