Use After Free in Linux
CVE-2023-53479
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.
Vulnerability class: Use-After-Free
EPSS: 0.001 (4.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux — versions e50fe01e1f2a4aba2275edee7d5c77ac87674ddb, 6.0, 0
- Linux Linux_kernel — versions 6.5
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2023-53479?
- CVE-2023-53479 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 7.8/10. Published 2025-10-01.
- How severe is CVE-2023-53479?
- High severity. CVSS v3 base score is 7.8 out of 10.