CVE-2026-98018: Linux kernel · net: mctp: i3c: serialize probe with bus removal
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 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 hold the busdevs_lock until the device is fully added, preventing the use-after-free condition. Users should update to patched kernel versions that include this fix. Patch status is not explicitly confirmed in the input data; therefore, check the vendor advisory for current remediation guidance.
Description
A use-after-free vulnerability in the Linux kernel's MCTP I3C driver was resolved. The issue occurs because the probe function releases a lock too early, allowing a concurrent bus removal to free memory before it is safely used, leading to a potential use of freed memory.
References
- ubuntu.com/security/CVE-2026-98018 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98018 (opens in a new tab)
- git.kernel.org/stable/c/e6541b2747682fdb2c6ded4a7cf7c39c4067a35c (opens in a new tab)
- git.kernel.org/stable/c/906d8dbafabfa81a30e3ade420cb9912f223a5e1 (opens in a new tab)
- git.kernel.org/stable/c/2b4707a149a55e8fa75c9ef32b359d60f470a566 (opens in a new tab)
- git.kernel.org/stable/c/765c5e357e67916a7aac8ead4ac2fa7d2bffe000 (opens in a new tab)