rhsa-2019:3978
Vulnerability from csaf_redhat
Published
2019-11-26 13:59
Modified
2025-11-08 05:20
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update

Notes

Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821) * kernel: local attacker can trigger multiple use-after-free conditions results in privilege escalation (CVE-2019-15239) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * kernel-rt: update to the RHEL7.7.z batch#3 source tree (BZ#1762889)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


To clipboard 

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      "acknowledgments": [
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          "names": [
            "Matt Delco"
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          "organization": "Google.com"
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      "cve": "CVE-2019-14821",
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        "name": "Out-of-bounds Write"
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          "text": "1746708"
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        {
          "category": "description",
          "text": "An out-of-bounds access issue was found in the way Linux kernel\u0027s KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer \u0027struct kvm_coalesced_mmio\u0027 object, wherein write indices \u0027ring-\u003efirst\u0027 and \u0027ring-\u003elast\u0027 value could be supplied by a host user-space process. An unprivileged host user or process with access to \u0027/dev/kvm\u0027 device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "Kernel: KVM: OOB memory access via mmio ring buffer",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue requires unprivileged users to have access to \u0027/dev/kvm\u0027 device. So restricting access to \u0027/dev/kvm\u0027 device to known trusted users could limit its exploitation by untrusted users/processes.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "title": "Vulnerability description"
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2019-15239"
        },
        {
          "category": "external",
          "summary": "RHBZ#1747353",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1747353"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-15239",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-15239"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-15239",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-15239"
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      "release_date": "2019-08-20T00:00:00+00:00",
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      "title": "kernel: local attacker can trigger multiple use-after-free conditions results in privilege escalation"
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  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.