MSRC_CVE-2020-12826

Vulnerability from csaf_microsoft - Published: 2020-05-02 00:00 - Updated: 2020-09-25 00:00
Summary
A signal access-control issue was discovered in the Linux kernel before 5.6.5 aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs and the lack of scenarios where signals to a parent process present a substantial operational threat.

Notes

Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
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        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
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    "publisher": {
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      "name": "Microsoft Security Response Center",
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    "references": [
      {
        "category": "self",
        "summary": "CVE-2020-12826 A signal access-control issue was discovered in the Linux kernel before 5.6.5 aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs and the lack of scenarios where signals to a parent process present a substantial operational threat. - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2020/msrc_cve-2020-12826.json"
      },
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        "category": "external",
        "summary": "Microsoft Support Lifecycle",
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      },
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        "summary": "Common Vulnerability Scoring System",
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    ],
    "title": "A signal access-control issue was discovered in the Linux kernel before 5.6.5 aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs and the lack of scenarios where signals to a parent process present a substantial operational threat.",
    "tracking": {
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  "vulnerabilities": [
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      "cve": "CVE-2020-12826",
      "cwe": {
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        "name": "Integer Overflow or Wraparound"
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      "notes": [
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          "category": "self",
          "summary": "CVE-2020-12826 A signal access-control issue was discovered in the Linux kernel before 5.6.5 aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs and the lack of scenarios where signals to a parent process present a substantial operational threat. - VEX",
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            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "environmentalsScore": 0.0,
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "temporalScore": 5.3,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
            "version": "3.1"
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          "products": [
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      "title": "A signal access-control issue was discovered in the Linux kernel before 5.6.5 aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs and the lack of scenarios where signals to a parent process present a substantial operational threat."
    }
  ]
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.