CVE-2026-98217: Linux kernel · IB/mlx4: Fix use-after-free on pkey sysfs registration failure
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:27 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 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.
Description
In the Linux kernel, the following vulnerability has been resolved: IB/mlx4: Fix use-after-free on pkey sysfs registration failure register_pkey_tree() ignores errors from register_one_pkey_tree() and continues registering the remaining slaves. The per-slave error path has already released the pkey parent kobjects, but their pointers remain stored in the device. A later device cleanup therefore passes the stale pointers to kobject_put(), causing a use-after-free. Clear the parent pointers after releasing a failed slave tree and skip unregistered trees during device cleanup. This preserves the existing best-effort registration behavior while preventing a second cleanup of the failed tree.
References
- ubuntu.com/security/CVE-2026-98217 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98217 (opens in a new tab)
- git.kernel.org/linus/1af874e9f4ce22ccf8b10ab5462f32c70d3be21a (opens in a new tab)
- git.kernel.org/stable/c/0c3482e965b18bc242e54e899d1c4d391ca8e5e3 (opens in a new tab)
- git.kernel.org/stable/c/1af874e9f4ce22ccf8b10ab5462f32c70d3be21a (opens in a new tab)
- git.kernel.org/stable/c/734f066933484f6c7cedea0312763249beed5845 (opens in a new tab)
- git.kernel.org/stable/c/791471421d848ce13e84f4b21c9e19973d471c4e (opens in a new tab)
- git.kernel.org/stable/c/a07bee32127d7c4cd3b1bb9a088e21d0c93634c9 (opens in a new tab)
- git.kernel.org/stable/c/ced1186fea7c77e16681c7ef4802897885989c3b (opens in a new tab)
- git.kernel.org/stable/c/cf20d7476754c00eec04ae23d3e929de33ce0345 (opens in a new tab)
- git.kernel.org/stable/c/ffb80872617b5f9b3dd1536ec2909029fa66f228 (opens in a new tab)