CVE-2022-50433
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Publication date: 2025-10-01

Last updated on: 2026-01-20

Assigner: kernel.org

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.
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Meta Information
Published
2025-10-01
Last Modified
2026-01-20
Generated
2026-06-16
AI Q&A
2025-10-01
EPSS Evaluated
2026-06-15
NVD
CVE-2022-50433
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.0 (inc) to 6.0.4 (exc)
linux linux_kernel 6.1
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability is a use-after-free error in the Linux kernel related to the handling of ACPI tables loaded via EFI. Specifically, memory holding a new ACPI table was being freed unconditionally, even when the table was successfully loaded, which could lead to accessing freed memory. The fix involves not freeing the memory if the ACPI table was loaded successfully.

Impact Analysis

The use-after-free vulnerability could lead to system instability, crashes, or potentially allow an attacker to execute arbitrary code or cause denial of service by exploiting the improper memory handling in the ACPI table loading process.

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