CVE-2026-98217
IB/mlx4: Fix use-after-free on pkey sysfs registration failure
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.
INFO
Published Date :
Oct. 6, 2026, 9:18 a.m.
Last Modified :
Oct. 19, 2026, 10:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Clear parent pointers after releasing a failed slave tree.
- Skip unregistered trees during device cleanup.
- Apply the Linux kernel patch for IB/mlx4.
References to Advisories, Solutions, and Tools
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CVE-2026-98217.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-98217 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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approaches employed by adversaries to exploit the CVE-2026-98217
weaknesses.
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The following table lists the changes that have been made to the
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 19, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/98xxx/CVE-2026-98217.json">CVE-2026-98217</a> -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 06, 2026
Action Type Old Value New Value Added 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/98xxx/CVE-2026-98217.json">CVE-2026-98217</a> Added Reference https://git.kernel.org/stable/c/0c3482e965b18bc242e54e899d1c4d391ca8e5e3 Added Reference https://git.kernel.org/stable/c/1af874e9f4ce22ccf8b10ab5462f32c70d3be21a Added Reference https://git.kernel.org/stable/c/734f066933484f6c7cedea0312763249beed5845 Added Reference https://git.kernel.org/stable/c/791471421d848ce13e84f4b21c9e19973d471c4e Added Reference https://git.kernel.org/stable/c/a07bee32127d7c4cd3b1bb9a088e21d0c93634c9 Added Reference https://git.kernel.org/stable/c/ced1186fea7c77e16681c7ef4802897885989c3b Added Reference https://git.kernel.org/stable/c/cf20d7476754c00eec04ae23d3e929de33ce0345 Added Reference https://git.kernel.org/stable/c/ffb80872617b5f9b3dd1536ec2909029fa66f228