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
Affected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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 | 0:5.14.0-362.8.1.el9_3< * | unaffected |
0:5.14.0-362.8.1.el9_3< * | unaffected | ||
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: 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
隐蔽时间通道
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::appstream | |
| Red Hat | Red Hat Enterprise Linux 9 | 0:5.14.0-362.8.1.el9_3 ~ * | cpe:/a:redhat:enterprise_linux:9::appstream | |
| 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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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 9
- CVE-2026-58379
Gimp: gimp: heap buffer overflow in read_channel_data() - CVE-2026-53704
Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read - CVE-2023-6917
Pcp: unsafe use of directories allows pcp to root privilege - CVE-2024-1151
Kernel: stack overflow problem in open vswitch kernel module - CVE-2023-6531
Kernel: gc's deletion of an skb races with unix_stream_read_
Same vendor: Red Hat
- CVE-2026-15584
Redhatinsights/incluster-checks: incluster-checks: privilege - CVE-2026-62147
Tempo-operator: tempo operator: query rbac bypass - CVE-2026-15574
Vllm-orchestrator-gateway: vllm-orchestrator-gateway: author - CVE-2026-15143
Guardrails-detectors: guardrails-detectors: ssrf and local f - CVE-2026-15028
Libarchive: heap overflow oob read while parsing a tar archi
Same weakness: CWE-385
V. Comments for CVE-2023-3640
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