rhsa-2019_4154
Vulnerability from csaf_redhat
Published
2019-12-10 12:06
Modified
2024-11-15 04:13
Summary
Red Hat Security Advisory: kernel-alt security, bug fix, and enhancement update

Notes

Topic
An update for kernel-alt 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-alt packages provide the Linux kernel version 4.x. Security Fix(es): * Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821) * kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service (CVE-2017-18203) * kernel: use-after-free Read in vhost_transport_send_pkt (CVE-2018-14625) * kernel: Information leak in cdrom_ioctl_drive_status (CVE-2018-16658) 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): * IPMI use after free issue seen on Marvell ThunderX2 (BZ#1732163) * kernel: siginfo delivers SEGV_MAPERR instead of SEGV_ACCERR [rhel-alt-7.6.z] (BZ#1757189) Enhancement(s): * [Marvell 7.7 z-stream BUG] CN99xx: DIMM label not extracted in EDAC hw error log (BZ#1721427)
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.



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        "text": "An update for kernel-alt is now available for Red Hat Enterprise Linux 7.\n\nRed 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.",
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        "text": "The kernel-alt packages provide the Linux kernel version 4.x.\n\nSecurity Fix(es):\n\n* Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)\n\n* kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service (CVE-2017-18203)\n\n* kernel: use-after-free Read in vhost_transport_send_pkt (CVE-2018-14625)\n\n* kernel: Information leak in cdrom_ioctl_drive_status (CVE-2018-16658)\n\nFor 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.\n\nBug Fix(es):\n\n* IPMI use after free issue seen on Marvell ThunderX2 (BZ#1732163)\n\n* kernel: siginfo delivers SEGV_MAPERR instead of SEGV_ACCERR [rhel-alt-7.6.z] (BZ#1757189)\n\nEnhancement(s):\n\n* [Marvell 7.7 z-stream BUG] CN99xx: DIMM label not extracted in EDAC hw error log (BZ#1721427)",
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      "cwe": {
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        "name": "Uncontrolled Resource Consumption"
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      "discovery_date": "2018-03-02T00:00:00+00:00",
      "ids": [
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          "text": "1550811"
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          "category": "description",
          "text": "The Linux kernel, before version 4.14.3, is vulnerable to a denial of service in drivers/md/dm.c:dm_get_from_kobject() which can be caused by local users leveraging a race condition with __dm_destroy() during creation and removal of DM devices. Only privileged local users (with CAP_SYS_ADMIN capability) can directly perform the ioctl operations for dm device creation and removal and this would typically be outside the direct control of the unprivileged attacker.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, as the code with the flaw is not present in this product.",
          "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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    {
      "cve": "CVE-2018-14625",
      "cwe": {
        "id": "CWE-362",
        "name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)"
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          "category": "description",
          "text": "A flaw was found where an attacker may be able to have an uncontrolled read to kernel-memory from within a vm guest.  A race condition between connect() and close() function may allow an attacker using the AF_VSOCK protocol to gather a 4 byte information leak or possibly impersonate AF_VSOCK messages destined to other clients or leak kernel memory.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: use-after-free Read in vhost_transport_send_pkt",
          "title": "Vulnerability summary"
        },
        {
          "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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          "details": "Moderate"
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      "title": "kernel: use-after-free Read in vhost_transport_send_pkt"
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    {
      "cve": "CVE-2018-16658",
      "cwe": {
        "id": "CWE-200",
        "name": "Exposure of Sensitive Information to an Unauthorized Actor"
      },
      "discovery_date": "2018-09-07T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "1627731"
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      "notes": [
        {
          "category": "description",
          "text": "An information leak was discovered in the Linux kernel in cdrom_ioctl_drive_status() function in drivers/cdrom/cdrom.c that could be used by local attackers to read kernel memory at certain location.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Information leak in cdrom_ioctl_drive_status",
          "title": "Vulnerability summary"
        },
        {
          "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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            "baseScore": 4.0,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "category": "impact",
          "details": "Low"
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      "title": "kernel: Information leak in cdrom_ioctl_drive_status"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Matt Delco"
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          "organization": "Google.com"
        }
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      "cve": "CVE-2019-14821",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
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          "text": "1746708"
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      "notes": [
        {
          "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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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "Kernel: KVM: OOB memory access via mmio ring buffer"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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