Improper Validation of Specified Quantity in Input in Linux kernel - CVE-2026-53372

Vulnerability identifier: #VU138897

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-53372

CWE-ID: CWE-1284

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a loss of dirty page tracking integrity.

The vulnerability exists due to improper state validation in PASID attachment handling for nested IOMMU domains when attaching a PASID to a nested domain with dirty tracking configured on the parent domain. A local user can attach a PASID to such a nested domain to cause a loss of dirty page tracking integrity.

The issue occurs because the kernel lacks dirty tracking support for nested domains in this configuration.

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/3ea9ce757bd3de955b56e7bc5672fc479e40b045
• https://git.kernel.org/stable/c/9009c1af5458322469fa9a4371081a4449c5947d
• https://git.kernel.org/stable/c/cc5bd898ff70710ffc41cd8e5c2741cb64750047

• Improper Validation of Specified Quantity in Input in Linux kernel iommu intel driver
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia