Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-89446

Vulnerability identifier: #VU149357

CSH Severity: Low

CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-89446

CWE-ID: CWE-772

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper resource release in iommufd_take_all_iova_rwsem() when xa_store() fails while storing an IOAS in the temporary ioas_list xarray. A local user can trigger an xa_store() failure while taking IOAS IOVA read-write semaphores to cause a denial of service.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/07b4fe1367f076886c1c47a19c70936138325087
• https://git.kernel.org/stable/c/4ac2ce123824d5f885c868fa1f9f4d463141a2ba
• https://git.kernel.org/stable/c/4c33d00ad9a911e87ea222986f732ce072e3aa26

• Missing Release of Resource after Effective Lifetime in Linux kernel iommu iommufd driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more