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
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过差异性导致的信息暴露
Source: NVD (National Vulnerability Database)
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 9 | 0:5.14.0-362.8.1.el9_3 ~ * | cpe:/a:redhat:enterprise_linux:9::realtime | |
| Red Hat | Red Hat Enterprise Linux 9 | 0:5.14.0-362.8.1.el9_3 ~ * | cpe:/a:redhat:enterprise_linux:9::realtime | |
| 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 |
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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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 |
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V. Comments for CVE-2023-3640
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