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CVE-2023-3640— Kernel: 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

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 6
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于X86 CPU的cpu_entry_area映射中存在未授权内存访问漏洞。

CVSS 7.0 · High EPSS 0.76% · P52

Affected Version Matrix 7

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 8 any affected
any affected
Red Hat Red Hat Enterprise Linux 9 any affected
any affected
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I. Basic Information for CVE-2023-3640

Vulnerability Information
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Vulnerability Title
Kernel: 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
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
隐蔽时间通道
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于X86 CPU的cpu_entry_area映射中存在未授权内存访问漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2023-3640

# POC Description Source Link Shenlong Link
1 SCTF 2023 kernel pwn && CVE-2023-3640 https://github.com/pray77/CVE-2023-3640 POC Details
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III. Intelligence Information for CVE-2023-3640

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Vendor Advisories for CVE-2023-3640 (3)

Same Patch Batch · Red Hat · 2023-07-24 · 10 CVEs total

CVE-2023-3812 7.8 HIGH Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags
CVE-2023-38200 7.5 HIGH Keylime: registrar is subject to a dos against ssl connections
CVE-2023-3567 7.1 HIGH Kernel: use after free in vcs_read in drivers/tty/vt/vc_screen.c due to race
CVE-2023-33952 6.7 MEDIUM Kernel: vmwgfx: double free within the handling of vmw_buffer_object objects
CVE-2023-33951 6.7 MEDIUM Kernel: vmwgfx: race condition leading to information disclosure vulnerability
CVE-2023-3750 6.5 MEDIUM Libvirt: improper locking in virstoragepoolobjlistsearch may lead to denial of service
CVE-2023-3019 6.0 MEDIUM Qemu: e1000e: heap use-after-free in e1000e_write_packet_to_guest()
CVE-2023-3745 5.5 MEDIUM Imagemagick: heap-buffer-overflow in pushcharpixel() in quantum-private.h
CVE-2023-3384 5.4 MEDIUM Quay: stored cross site scripting

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 6
Same vendor: Red Hat
Same weakness: CWE-385

V. Comments for CVE-2023-3640

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