CVE-2022-50433 Details
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.
A use-after-free vulnerability has been identified in the Linux kernel's handling of ACPI tables, specifically within the EFI SSDT loading process. This issue arises because the memory containing the newly loaded ACPI table is freed unconditionally, rather than only in cases where the ACPI core fails to load the table. The vulnerability was introduced by a previous commit that altered how SSDTs are loaded from variables, bypassing the efivars layer. The unconditional memory deallocation can lead to use-after-free errors, which may be exploitable under certain conditions.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for upgrading the Linux kernel can be found in the official Linux documentation or through the package management system of the respective Linux distribution.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/11497fd69cd2282538ec6eb4cda1d16fc061233d | kernel.org | Patch |
| https://git.kernel.org/stable/c/4b017e59f01097f19b938f6dc4dc2c4720701610 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.0, < 6.0.4 6.1 rc1 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jan 20, 2026 | Initial Analysis | [email protected] |
| Oct 1, 2025 | New CVE Received | kernel.org |