CVE-2026-93200: Linux kernel · i3c: master: Fix use-after-free of master->this
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 4% 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.
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 corrects the lifecycle management of the master->this pointer by keeping it alive until the device release phase. Users should apply the updated Linux kernel versions that include this fix. No additional mitigation steps are indicated by the vendor advisory.
Description
A use-after-free vulnerability in the Linux kernel's i3c master controller device sysfs attribute callbacks was resolved. The issue occurs because the master->this pointer is freed prematurely in the device detach path, leading to potential dereferencing of a freed pointer during sysfs accesses. The fix ensures master->this remains valid until the device release phase, preventing use-after-free.
References
- ubuntu.com/security/CVE-2026-93200 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93200 (opens in a new tab)
- git.kernel.org/linus/feb0ed76601f3c2f91f08688c5a7d8b9d382f720 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-93200 (opens in a new tab)
- git.kernel.org/stable/c/23a1c4288a60e253a05a882bd8928ed61beb4a48 (opens in a new tab)
- git.kernel.org/stable/c/4f3145db05fede36b35f8249b8acde5bd5d54864 (opens in a new tab)
- git.kernel.org/stable/c/50034d8d0f797c3a7a599f750a7d3e792e80dea5 (opens in a new tab)
- git.kernel.org/stable/c/feb0ed76601f3c2f91f08688c5a7d8b9d382f720 (opens in a new tab)