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Vulnerability · Published Jul 24, 2023 · Assigned by redhat

CVE-2023-3640Kernel: x86/mm: a per-cpu entry area leak was identified through the init_cea_offsets function when prefetchnta and prefetcht2 instructions being used for the per-cpu entry area mapping to the user space

High 7.0

In plain English

A high-severity security flaw in Red Hat Enterprise Linux 6 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)7.0High
Exploit odds (30 days)0.8%top 44.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

A possible unauthorized memory access flaw was found in the Linux kernel's cpu_entry_area mapping of X86 CPU data to memory, where a user may guess the location of exception stacks or other important data. Based on the previous CVE-2023-0597, the 'Randomize per-cpu entry area' feature was implemented in /arch/x86/mm/cpu_entry_area.c, which works through the init_cea_offsets() function when KASLR is enabled. However, despite this feature, there is still a risk of per-cpu entry area leaks. This issue could allow a local user to gain access to some important data with memory in an expected location and potentially escalate their privileges on the system.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2023-3640
Debian:13linuxno fix listedDEBIAN-CVE-2023-3640
Debian:14linuxno fix listedDEBIAN-CVE-2023-3640
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linuxno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linux-awsno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linux-azureno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linux-azure-fdeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linux-gcpno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linux-oracleno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linux-raspino fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linux-realtimeno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-3640
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-3640
Ubuntu:26.10linux-riscvno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2023-3640
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2023-3640
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2023-3640

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-385 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References