NULL pointer dereference in Linux
CVE-2023-52976
In the Linux kernel, the following vulnerability has been resolved: efi: fix potential NULL deref in efi_mem_reserve_persistent When iterating on a linked list, a result of memremap is dereferenced without checking it for NULL. This patch adds a check that falls back on allocating a new page in case memremap doesn't succeed. Found by Linux Verification Center (linuxtesting.org) with SVACE. [ardb: return -ENOMEM instead of breaking out of the loop]
EPSS: 0.003 (18.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux — versions b5961ecad7121fec138ebee7d9eba4863f9dc6e7, 6.2, 5.15.93
- Linux Linux_kernel — versions 6.2
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2023-52976?
- CVE-2023-52976 is a medium-severity vulnerability in Linux, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2025-03-27.
- How severe is CVE-2023-52976?
- Medium severity. CVSS v3 base score is 5.5 out of 10.