SB2026072056 - Improper Check for Unusual or Exceptional Conditions in Linux kernel iommu generic_pt driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-64151)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper handling of a missing page size check in iommupt page table mapping logic when mapping a range with PAGE_SIZE. A local user can trigger the affected mapping path to cause a denial of service.

The issue arises when PAGE_SIZE is missing from the pgsize_bitmap during use of the fast path.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/00850f41da24423587abd6124a790dd4f12bcef3
• https://git.kernel.org/stable/c/8ef3f77c440005c7f04229a75976bfc078364247