CVE-2026-89739: Linux kernel · usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| 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 cancels the delayed work before freeing the associated memory in dwc3_gadget_free_endpoints. Users should apply the updated Linux kernel versions containing this fix. No additional mitigation steps are indicated.
Description
A use-after-free vulnerability was identified and resolved in the Linux kernel's USB dwc3 gadget driver. The issue arises due to a race condition where delayed work referencing freed memory may still execute after the gadget endpoints are freed. This can lead to use of freed memory, potentially causing system instability or crashes. The fix involves canceling the delayed work before freeing the associated memory.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89739 (opens in a new tab)
- git.kernel.org/stable/c/448e95c0f3eaa8d99f16ccae92ab94545f14413b (opens in a new tab)
- git.kernel.org/stable/c/93e08b13a7a30e4e78556d993720e0bc36231ec7 (opens in a new tab)
- git.kernel.org/stable/c/9c855832790cd488d87de1885974f4c37cfe7358 (opens in a new tab)
- ubuntu.com/security/CVE-2026-89739 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89739 (opens in a new tab)
- git.kernel.org/linus/9c855832790cd488d87de1885974f4c37cfe7358 (opens in a new tab)
- git.kernel.org/stable/c/5f359265f616873edf32db418bd1513fdae3ddec (opens in a new tab)