CVE-2023-53479
Analyzed Analyzed - Analysis Complete
BaseFortify

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: cxl/acpi: Fix a use-after-free in cxl_parse_cfmws() KASAN and KFENCE detected an user-after-free in the CXL driver. This happens in the cxl_decoder_add() fail path. KASAN prints the following error: BUG: KASAN: slab-use-after-free in cxl_parse_cfmws (drivers/cxl/acpi.c:299) This happens in cxl_parse_cfmws(), where put_device() is called, releasing cxld, which is accessed later. Use the local variables in the dev_err() instead of pointing to the released memory. Since the dev_err() is printing a resource, change the open coded print format to use the %pr format specifier.
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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-2023-53479
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.0 (inc) to 6.1.43 (exc)
linux linux_kernel From 6.2 (inc) to 6.4.8 (exc)
linux linux_kernel 6.5
linux linux_kernel 6.5
linux linux_kernel 6.5
Helpful Resources
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 bug in the Linux kernel's CXL driver, specifically in the cxl_parse_cfmws() function. It occurs when the function releases a device structure (cxld) using put_device(), but then later accesses that released memory, leading to a potential memory safety issue detected by KASAN and KFENCE.

Impact Analysis

The use-after-free vulnerability can lead to undefined behavior such as system crashes or potential escalation of privileges if exploited, as it involves accessing memory after it has been freed. This can compromise system stability and security.

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