CVE-2026-89728: Linux kernel · i3c: renesas: Fix out-of-bounds access for newdevs mask
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 9% 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 has been applied to the Linux kernel to correct the out-of-bounds access condition in the Renesas I3C controller driver. Users should update to a patched kernel version that includes this fix. Since this is a kernel-level issue, applying the official kernel update from the Linux distribution vendor is the recommended remediation.
Description
A vulnerability in the Linux kernel's Renesas I3C controller driver caused an out-of-bounds access when computing the bitmask for newly discovered devices during Dynamic Address Assignment (DAA). This occurs because when the I3C bus is empty, the data length field incorrectly indicates the maximum number of devices supported, leading to an out-of-bounds condition. The issue has been resolved by adjusting the condition that computes the bitmask to prevent this out-of-bounds access.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89728 (opens in a new tab)
- git.kernel.org/stable/c/50dec95c9d1f1f82819bc898ef2b60fa83fd4ccd (opens in a new tab)
- git.kernel.org/stable/c/769f5a233efcf8587f70fb2244a202d88582c746 (opens in a new tab)
- ubuntu.com/security/CVE-2026-89728 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89728 (opens in a new tab)
- git.kernel.org/linus/50dec95c9d1f1f82819bc898ef2b60fa83fd4ccd (opens in a new tab)