Improper input validation in Linux kernel - CVE-2026-53370

Vulnerability identifier: #VU138895

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-2026-53370

CWE-ID: CWE-20

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 input validation in intel_pmu_acr_late_setup() when processing user-supplied ACR masks. A local user can supply a crafted attr.config2 mask to cause a denial of service.

The issue involves incomplete validation of ACR mask bits, skipping configuration of subsequent ACR groups on invalid input, and reuse of stale hardware ACR mask state.

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/5ad732a56be46aabf158c16aa0c095291727aaef
• https://git.kernel.org/stable/c/aab56b95bee3ff79176b13443cd9d7cfe9747df0
• https://git.kernel.org/stable/c/c05e01cef47d9b4969eae2dcf9467e2a555bcb4f

• Improper input validation in Linux kernel events intel
• 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