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CVE-2026-98217

Linux: IB/mlx4: Fix use-after-free on pkey sysfs registration failure

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in791471421d848ce13e84f4b21c9e19973d471c4eAlso 734f066933484f6c7cedea0312763249beed5845, 0c3482e965b18bc242e54e899d1c4d391ca8e5e3 and 1 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 791471421d848ce13e84f4b21c9e19973d471c4eLinuxCVE List
  • 734f066933484f6c7cedea0312763249beed5845LinuxCVE List
  • 0c3482e965b18bc242e54e899d1c4d391ca8e5e3LinuxCVE List
  • 1af874e9f4ce22ccf8b10ab5462f32c70d3be21aLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 18

  • Linuxaffected: c1e7e466120b80ce49e91af0c9da1ce6dee4844a before 791471421d848ce13e84f4b21c9e19973d471c4eCVE List
  • Linuxaffected: c1e7e466120b80ce49e91af0c9da1ce6dee4844a before 734f066933484f6c7cedea0312763249beed5845CVE List
  • Linuxaffected: c1e7e466120b80ce49e91af0c9da1ce6dee4844a before a07bee32127d7c4cd3b1bb9a088e21d0c93634c9CVE List
  • Linuxaffected: c1e7e466120b80ce49e91af0c9da1ce6dee4844a before cf20d7476754c00eec04ae23d3e929de33ce0345CVE List
  • Linuxaffected: c1e7e466120b80ce49e91af0c9da1ce6dee4844a before 0c3482e965b18bc242e54e899d1c4d391ca8e5e3CVE List
  • Linuxaffected: c1e7e466120b80ce49e91af0c9da1ce6dee4844a before ffb80872617b5f9b3dd1536ec2909029fa66f228CVE List
  • Linuxaffected: c1e7e466120b80ce49e91af0c9da1ce6dee4844a before ced1186fea7c77e16681c7ef4802897885989c3bCVE List
  • Linuxaffected: c1e7e466120b80ce49e91af0c9da1ce6dee4844a before 1af874e9f4ce22ccf8b10ab5462f32c70d3be21aCVE List
  • Linuxaffected: 3.7CVE List
  • Linuxunaffected: all versions before 3.7CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8