What’s Vulnerable › Vulnerabilities

CVE-2023-52976: efi: fix potential NULL deref in efi_mem_reserve_persistent

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-27 · updated 2026-06-17
• Weakness: CWE-476

Description

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]

Affected products

• Linux kernel: from 5.1.16 before 5.4.232; from 5.5 before 5.10.168; from 5.11 before 5.15.93; from 5.16 before 6.1.11; 6.2-rc1, 6.2-rc2, 6.2-rc3, 6.2-rc4, 6.2-rc5, 6.2-rc6 — fixed in 5.10.168, 5.15.93, 5.4.232, 6.1.11

How to fix

Upgrade to a fixed version: Linux kernel 5.10.168, 5.15.93, 5.4.232, 6.1.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/87d4ff18738fd71e7e3c10827c80257da6283697
• https://git.kernel.org/stable/c/966d47e1f27c45507c5df82b2a2157e5a4fd3909
• https://git.kernel.org/stable/c/a2e6a9ff89f13666a1c3ff7195612ab949ea9afc
• https://git.kernel.org/stable/c/d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23c
• https://git.kernel.org/stable/c/d92a25627bcdf264183670da73c9a60c0bac327e

Get alerted when CVE-2023-52976 or the next vulnerability affects your stack