CVE-2023-53266 arm64: acpi: Fix possible memory leak of ffh_ctxt

What is CVE-2023-53266?

CVE-2023-53266 is a medium-severity memory corruption vulnerability in Linux kernel, published on 16 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

arm64: acpi: Fix possible memory leak of ffh_ctxt

Allocated 'ffh_ctxt' memory leak is possible if the SMCCC version and conduit checks fail and -EOPNOTSUPP is returned without freeing the allocated memory.

Fix the same by moving the allocation after the SMCCC version and conduit checks.

Weakness: CWE-401

Which versions are affected by CVE-2023-53266?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53266?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-53266 being exploited?

There is no known exploitation of CVE-2023-53266 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2023-53266, DEBIAN-CVE-2023-53266, GHSA-cm47-3p73-qqc3, UBUNTU-CVE-2023-53266.