Memory leak in Linux kernel - CVE-2025-21770

Vulnerability identifier: #VU104940

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2025-21770

CWE-ID: CWE-401

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the iopf_queue_remove_device() function in drivers/iommu/io-pgfault.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-lowlatency (Ubuntu package)

Install update from vendor's website.

Linux kernel - update to 6.12.16
linux (Ubuntu package) - addressed in versions 6.11.0-26.26, 6.11.0-26.26~24.04.1, 6.11.0-1010.10, 6.11.0-1013.13, 6.11.0-1015.15, 6.11.0-1015.15~24.04.1, 6.11.0-1022.22
linux-aws (Ubuntu package) - update to 6.11.0-1014.15
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1014.15, 6.11.0-1014.15~24.04.1, 6.11.0-1016.17

• https://git.kernel.org/stable/c/90d5429cd2921ca2714684ed525898d431bb9283
• https://git.kernel.org/stable/c/9759ae2cee7cd42b95f1c48aa3749bd02b5ddb08
• https://git.kernel.org/stable/c/db60d2d896a17decd58d143eef92cf22eb0a0176
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.16

• Memory leak in Linux kernel iommu driver
• Ubuntu update for linux
• Ubuntu update for linux-aws
• Ubuntu update for linux-lowlatency