SB20260912336 - Missing Release of Resource after Effective Lifetime in Linux kernel iommu iommufd driver
Published: September 12, 2026
Security Bulletin ID
SB20260912336
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-89447)
CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper resource release in iommufd_access_notify_unmap() when handling unmap notifications for internal accesses. A local user can trigger unmap handling involving internal accesses to cause a denial of service.
Internal accesses do not have an external unmap callback.
Remediation
Install update from vendor's website.