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Vulnerability · Published Mar 27, 2025 · Assigned by Linux

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

Medium 5.5

In plain English

A medium-severity null pointer dereference in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.3%top 79.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.11-1DEBIAN-CVE-2023-52976
Debian:13linux6.1.11-1DEBIAN-CVE-2023-52976
Debian:14linux6.1.11-1DEBIAN-CVE-2023-52976
Ubuntu:22.04:LTSlinux5.15.0-72.79UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-aws5.15.0-1036.40UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-azure5.15.0-1038.45UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1038.45.1UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-gcp5.15.0-1034.42UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-gke5.15.0-1033.38UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1020.25UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-ibm5.15.0-1030.33UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1030.35UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-kvm5.15.0-1033.38UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-72.79UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1025.25UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-oracle5.15.0-1035.41UBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-raspi5.15.0-1029.31UBUNTU-CVE-2023-52976
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-52976
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-52976
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-52976

Affected products (as reported)

VendorProductVersions
Linux Linux 18df7577adae6c6c778bf774b3aebcacbc1fb439 – before d92a25627bcdf264183670da73c9a60c0bac327e18df7577adae6c6c778bf774b3aebcacbc1fb439 – before 87d4ff18738fd71e7e3c10827c80257da628369718df7577adae6c6c778bf774b3aebcacbc1fb439 – before d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23c18df7577adae6c6c778bf774b3aebcacbc1fb439 – before a2e6a9ff89f13666a1c3ff7195612ab949ea9afc18df7577adae6c6c778bf774b3aebcacbc1fb439 – before 966d47e1f27c45507c5df82b2a2157e5a4fd3909b5961ecad7121fec138ebee7d9eba4863f9dc6e75.1.16 – before 5.2
Linux Linux 5.2

Weakness: CWE-476 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References