CVE-2026-89737: Linux kernel · usb: typec: thunderbolt: Disable work before freeing tbt on remove
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 disables and drains the tbt->work queue before freeing references during device removal. Users should apply the official kernel updates that include this fix. Since this is a kernel-level issue, updating to patched kernel versions is the recommended remediation.
Description
A vulnerability in the Linux kernel's USB Type-C Thunderbolt driver was resolved by disabling and draining scheduled work before freeing resources during device removal. The flaw involved the tbt_altmode_remove() function dropping plug and cable references without properly draining the associated work queue, which could lead to use-after-free conditions. This issue was identified through static analysis and manual code review. The vulnerability affects specific Linux kernel versions used in various Ubuntu LTS releases.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89737 (opens in a new tab)
- git.kernel.org/stable/c/0a25484fe22f621e151367a59a82330a22ac80bc (opens in a new tab)
- git.kernel.org/stable/c/92090f6ff2acc81e9dd99881dcfb4f8c1bdaabd3 (opens in a new tab)
- git.kernel.org/stable/c/ebb840d982a612261cfc8a7687735a140c6c7024 (opens in a new tab)
- ubuntu.com/security/CVE-2026-89737 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89737 (opens in a new tab)
- git.kernel.org/linus/92090f6ff2acc81e9dd99881dcfb4f8c1bdaabd3 (opens in a new tab)