CVE-2022-50433: efi: ssdt: Don't free memory if ACPI table was loaded successfully

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-01 · updated 2026-06-17
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: efi: ssdt: Don't free memory if ACPI table was loaded successfully Amadeusz reports KASAN use-after-free errors introduced by commit 3881ee0b1edc ("efi: avoid efivars layer when loading SSDTs from variables"). The problem appears to be that the memory that holds the new ACPI table is now freed unconditionally, instead of only when the ACPI core reported a failure to load the table. So let's fix this, by omitting the kfree() on success.

Affected products

Linux kernel: from 6.0 before 6.0.4; 6.1-rc1 — fixed in 6.0.4

How to fix

Upgrade to a fixed version: Linux kernel 6.0.4. Check the vendor advisory for mitigations.

References

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