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

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-16 · updated 2026-06-17
Weakness: CWE-401

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.

Affected products

Linux kernel: from 6.2 before 6.2.3 — fixed in 6.2.3

How to fix

Upgrade to a fixed version: Linux kernel 6.2.3. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/1b561d3949f8478c5403c9752b5533211a757226
https://git.kernel.org/stable/c/7521da2eb42d65f89f511b7912d3757cf3d9168a

Get alerted when CVE-2023-53266 or the next vulnerability affects your stack