SB20261007147 - Incorrect Pointer Scaling in Linux kernel hw hfi1 driver

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Main Vulnerability Database SB20261007147

SB20261007147 - Incorrect Pointer Scaling in Linux kernel hw hfi1 driver

Published: October 7, 2026

Security Bulletin ID SB20261007147
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Incorrect Pointer Scaling (CVE-ID: CVE-2026-98216)

CWE-ID: CWE-468 - Incorrect Pointer Scaling

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to incorrect pointer scaling in the PIO_CRED case of hfi1_file_mmap() when mapping a credit-return page using a byte offset added to a struct credit_return pointer. A local user can map and read the affected credit-return page to cause a denial of service.

The erroneous offset occurs when the hardware send context index reaches 64 or 128. With IOMMU translation, the resulting mapping installs an invalid page-table entry, and the first user-space read triggers a kernel Oops.


Remediation

Install update from vendor's website.

References