CVE-2026-98086Public exploit

Kernel crash via premature legacy rawmidi dereference

Published Sep 25, 2026 · Updated Sep 25, 2026

NULL-pointer dereference in Linux 6.5 ALSA UMP handling allows physically proximate attackers to crash the kernel with a MIDI 2.0 device. snd_ump_parse_endpoint() marks the endpoint parsed before legacy_rmidi is attached, and an intervening UMP name packet makes ump_legacy_set_rawmidi_name() pass the NULL pointer to snprintf(). The path requires UMP, legacy rawmidi, and USB-audio support plus a MIDI 2.0 device or gadget; winning the short attachment race causes a fatal exception in interrupt context.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in Linux 6.5 ALSA UMP handling allows physically proximate attackers to crash the kernel with a MIDI 2.0 device. snd_ump_parse_endpoint() marks the endpoint parsed before legacy_rmidi is attached, and an intervening UMP name packet makes ump_legacy_set_rawmidi_name() pass the NULL pointer to snprintf(). The path requires UMP, legacy rawmidi, and USB-audio support plus a MIDI 2.0 device or gadget; winning the short attachment race causes a fatal exception in interrupt context.

The record

CVE
CVE-2026-98086
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=37e0e14128e0685267dc5c037bf655421a6ce2ea <1c8e01792adf91879322f1ad752f1814de8b7e7d
  2. Affected versionversion=37e0e14128e0685267dc5c037bf655421a6ce2ea <228075f31b141395233218712242913125ace4e0
  3. Affected versionversion=37e0e14128e0685267dc5c037bf655421a6ce2ea <a4cef20cd473e0640fefd38094d4baac0ec76ae3
  4. Affected versionversion=37e0e14128e0685267dc5c037bf655421a6ce2ea <adeee7187694719890aaffdc14b7e89cfd736f1d
  5. Affected versionversion=6.5

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=37e0e14128e0685267dc5c037bf655421a6ce2ea <1c8e01792adf91879322f1ad752f1814de8b7e7d; version=37e0e14128e0685267dc5c037bf655421a6ce2ea <228075f31b141395233218712242913125ace4e0; version=37e0e14128e0685267dc5c037bf655421a6ce2ea <a4cef20cd473e0640fefd38094d4baac0ec76ae3; version=37e0e14128e0685267dc5c037bf655421a6ce2ea <adeee7187694719890aaffdc14b7e89cfd736f1d; version=6.5

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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

Technologies

Your stack

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Your stack

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