VulnerabilityPublished 17 Sep 2026Updated 5 Oct 2026

CVE-2026-93118: Linux kernel · usb: gadget: aspeed_udc: check endpoint DMA allocation

Affects Linux kernelSource GCVE Database

Authoritative record:CVE-2026-93118· Medium

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: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 17 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 is available that adds proper allocation checks and safe cleanup during probe failures. Users should apply the updated Linux kernel versions containing this patch. Since this is a kernel-level fix, upgrading to patched kernel versions is the recommended remediation.

Description

A vulnerability in the Linux kernel's USB gadget driver for Aspeed UDC was resolved. The issue involved unchecked DMA buffer allocation failures during device probe, leading to dereferencing of null pointers and unsafe gadget unregistration. The fix adds proper allocation checks and a local cleanup helper to safely unwind resources on probe failure. This vulnerability affects specific Linux kernel versions used in various Ubuntu releases.

Impact

If the DMA buffer allocation fails during device probe, the driver may dereference a null pointer, potentially causing a kernel crash or instability. The unsafe cleanup path could also lead to improper gadget unregistration, further risking system stability. No known exploits are reported in the wild.

Summary

The Linux kernel's usb: gadget: aspeed_udc driver had a vulnerability where ast_udc_probe() allocated a coherent DMA buffer for endpoint buffers without checking if the allocation succeeded. Subsequently, ast_udc_init_ep() derived endpoint buffer pointers from this allocation, causing a null pointer dereference if the allocation failed. Additionally, the probe error path called ast_udc_remove() unconditionally before usb_add_gadget_udc() succeeded, which is unsafe. The patch adds checks for DMA buffer allocation success and a local cleanup helper to ensure only initialized resources are unwound on probe failure. This issue was identified by static analysis during scanning of Linux kernel 6.16 and fixed without runtime testing due to lack of hardware access.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Oct 2026, 23:43 UTC

Technical details

References

Community reviews

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