SB20260727290 - Improper input validation in Linux kernel iommu iommufd driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-64289)

CWE-ID: CWE-20 - Improper input validation

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 improper input validation in iommufd_hwpt_invalidate() when processing user-controlled invalidation parameters through the ioctl interface. A local user can supply a large entry_len or entry_num value to cause a denial of service.

The issue can trigger a soft-lockup watchdog event or pin the CPU in a non-preemptible kernel during invalidation processing.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2c6381d90898089287e0a358f06f89f6b4b389f2
• https://git.kernel.org/stable/c/32ca4aed2a66205b072fcfecabe220289a8149ff
• https://git.kernel.org/stable/c/4d70986002f2f3eaaed89124fb2522bded38b016
• https://git.kernel.org/stable/c/d2bd041e0efaf7d81789779b135279d18b33d6d5