VulnerabilityPublished 16 Sep 2026Updated 5 Oct 2026

CVE-2026-90024: Linux kernel · usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs

Affects Linux kernelSource GCVE Database

Not known to be exploited.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSlinux`pkg:deb/ubuntu/linux?arch=source&distro=resolute`Other threats	Affected 6.17.0-5.5 – 7.0.0-38.38 23 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure`pkg:deb/ubuntu/linux-azure?arch=source&distro=resolute`Other threats	Affected 6.17.0-1003.3 – 7.0.0-1017.17 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure-fde`pkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resolute`Other threats	Affected 7.0.0-1003.3 – 7.0.0-1016.16 9 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gcp`pkg:deb/ubuntu/linux-gcp?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 13 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gke`pkg:deb/ubuntu/linux-gke?arch=source&distro=resolute`Other threats	Affected 7.0.0-1002.3 – 7.0.0-1008.9 6 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix for this vulnerability has been implemented in the Linux kernel by modifying the f_midi2_free_ep_reqs() and f_midi2_alloc_ep_reqs() functions to safely handle uninitialized endpoints. Users should update to a kernel version that includes this fix. Patch status is not explicitly stated in the input data; therefore, check the vendor advisory or Linux kernel updates for the official fixed versions and apply them accordingly.

Description

A null-pointer dereference vulnerability in the Linux kernel's USB MIDI 2.0 gadget function (f_midi2_free_ep_reqs) has been fixed. The issue occurs when cleaning up an endpoint that was never initialized, leading to a crash. This happens specifically when configuring the MIDI 2.0 gadget with the block direction set to input, causing the midi1_ep_out endpoint to be skipped during initialization. The fix replaces an unsafe dereference with a safer check of the number of requests, preventing the crash.

Impact

This vulnerability causes a kernel crash (null-pointer dereference) when the affected USB MIDI 2.0 gadget function is configured in a specific way, potentially leading to denial of service on affected systems. There is no indication of privilege escalation or code execution. No known exploits are reported in the wild.

Summary

The Linux kernel's USB gadget MIDI 2.0 function contained a null-pointer dereference vulnerability in the f_midi2_free_ep_reqs() function. When the MIDI 2.0 gadget is configured via configfs with the block direction set to SNDRV_UMP_DIR_INPUT, the midi1_ep_out endpoint is not initialized, leaving usb_ep->card as NULL. Later, when the host sets the alternate setting, the kernel attempts to stop both IN and OUT endpoints and free their requests. The uninitialized midi1_ep_out endpoint causes a null-pointer dereference when accessing usb_ep->card->info.num_reqs, resulting in a kernel crash. The fix changes the code to use usb_ep->num_reqs, which is properly initialized to zero if the endpoint is uninitialized, thus avoiding the dereference and crash. The same fix was applied to the allocation function for consistency.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Oct 2026, 21:06 UTC

Technical details

References

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