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FKIE_CVE-2023-3640

Vulnerability from fkie_nvd - Published: 2023-07-24 16:15 - Updated: 2026-07-21 19:17
Severity
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2023:6583
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2023-3640Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2217523Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2023-3640Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2217523Issue Tracking, Third Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel -
redhat enterprise_linux 8.0
redhat enterprise_linux 9.0
To clipboard 

{
  "affected": [
    {
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:6"
          ],
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          "packageName": "kernel",
          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
        },
        {
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
          ],
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          "packageName": "kernel",
          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
        {
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          "cpes": [
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          ],
          "defaultStatus": "unaffected",
          "packageName": "kernel-rt",
          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
        {
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          "cpes": [
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          ],
          "defaultStatus": "affected",
          "packageName": "kernel",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
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          "cpes": [
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          ],
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          "packageName": "kernel-rt",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
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          "cpes": [
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          ],
          "defaultStatus": "affected",
          "packageName": "kernel",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        },
        {
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          ],
          "defaultStatus": "affected",
          "packageName": "kernel-rt",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "configurations": [
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        {
          "cpeMatch": [
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              "vulnerable": true
            }
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    {
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              "vulnerable": true
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A possible unauthorized memory access flaw was found in the Linux kernel\u0027s 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 \u0027Randomize per-cpu entry area\u0027 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."
    }
  ],
  "id": "CVE-2023-3640",
  "lastModified": "2026-07-21T19:17:08.500",
  "metrics": {
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          "confidentialityImpact": "HIGH",
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          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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          "options": [
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          "role": "CISA Coordinator",
          "timestamp": "2025-03-05T18:36:10.948159Z",
          "version": "2.0.3"
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  "published": "2023-07-24T16:15:13.063",
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "type": "Secondary"
    }
  ]
}



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