rhsa-2016_1341
Vulnerability from csaf_redhat
Published
2016-06-27 10:02
Modified
2024-11-14 19:54
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 MRG 2.5. 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 package contain the Linux kernel, the core of any Linux operating system. This update provides a build of the kernel-rt package for Red Hat Enterprise MRG 2.5 that is layered on Red Hat Enterprise Linux 6, and provides a number of bug fixes including: * [netdrv] ixgbevf: fix spoofed packets with random MAC and use ether_addr_copy instead of memcpy * [mm] mmu_notifier: fix memory corruption * [mm] hugetlbfs: optimize when NUMA=n * [mm] optimize put_mems_allowed() usage * [x86] mm: suitable memory should go to ZONE_MOVABLE * [fs] xfs: fix splice/direct-IO deadlock * [acpi] tables: Add acpi_subtable_proc to ACPI table parsers * [acpi] table: Add new function to get table entries * [net] ipv6: Nonlocal bind * [net] ipv4: bind ip_nonlocal_bind to current netns (BZ#1332298) Security Fix(es): * A flaw was found in the way certain interfaces of the Linux kernel's Infiniband subsystem used write() as bi-directional ioctl() replacement, which could lead to insufficient memory security checks when being invoked using the splice() system call. A local unprivileged user on a system with either Infiniband hardware present or RDMA Userspace Connection Manager Access module explicitly loaded, could use this flaw to escalate their privileges on the system. (CVE-2016-4565, Important) * A race condition flaw was found in the way the Linux kernel's SCTP implementation handled sctp_accept() during the processing of heartbeat timeout events. A remote attacker could use this flaw to prevent further connections to be accepted by the SCTP server running on the system, resulting in a denial of service. (CVE-2015-8767, Moderate) * A flaw was found in the way the realtime kernel processed specially crafted ICMP echo requests. A remote attacker could use this flaw to trigger a sysrql function based on values in the ICMP packet, allowing them to remotely restart the system. Note that this feature is not enabled by default and requires elevated privileges to be configured. (CVE-2016-3707, Moderate) Red Hat would like to thank Jann Horn for reporting CVE-2016-4565. Bug Fix(es): * An oops can occur in the hpsa driver while submitting ioaccel2 commands when the phys_disk pointer is NULL (in hpsa_scsi_ioaccel_raid_map). Configuration changes during I/O operations could set the phys_disk pointer to NULL. In this case, send the command down the RAID path for correct processing, avoiding the oops. (BZ#1334260) * A faulty code merge left an extra spin_lock operation in the function fscache_invalidate_write(). The code has been correctly updated to remove this extra lock operation, which avoids a potential deadlock situation when looping through cache pages. (BZ#1327730)
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": "The kernel-rt package contain the Linux kernel, the core of any Linux\noperating system.\n\nThis update provides a build of the kernel-rt package for Red Hat\nEnterprise MRG 2.5 that is layered on Red Hat Enterprise Linux 6, and\nprovides a number of bug fixes including:\n\n* [netdrv] ixgbevf: fix spoofed packets with random MAC and use ether_addr_copy instead of memcpy \n* [mm] mmu_notifier: fix memory corruption \n* [mm] hugetlbfs: optimize when NUMA=n \n* [mm] optimize put_mems_allowed() usage \n* [x86] mm: suitable memory should go to ZONE_MOVABLE \n* [fs] xfs: fix splice/direct-IO deadlock \n* [acpi] tables: Add acpi_subtable_proc to ACPI table parsers \n* [acpi] table: Add new function to get table entries \n* [net] ipv6: Nonlocal bind \n* [net] ipv4: bind ip_nonlocal_bind to current netns \n\n(BZ#1332298)\n\nSecurity Fix(es):\n\n* A flaw was found in the way certain interfaces of the Linux kernel\u0027s\nInfiniband subsystem used write() as bi-directional ioctl() replacement,\nwhich could lead to insufficient memory security checks when being invoked\nusing the splice() system call. A local unprivileged user on a system\nwith either Infiniband hardware present or RDMA Userspace Connection\nManager Access module explicitly loaded, could use this flaw to escalate\ntheir privileges on the system. (CVE-2016-4565, Important)\n\n* A race condition flaw was found in the way the Linux kernel\u0027s SCTP\nimplementation handled sctp_accept() during the processing of heartbeat\ntimeout events. A remote attacker could use this flaw to prevent further\nconnections to be accepted by the SCTP server running on the system,\nresulting in a denial of service. (CVE-2015-8767, Moderate)\n\n* A flaw was found in the way the realtime kernel processed specially\ncrafted ICMP echo requests. A remote attacker could use this flaw to\ntrigger a sysrql function based on values in the ICMP packet, allowing them\nto remotely restart the system. Note that this feature is not enabled by\ndefault and requires elevated privileges to be configured. (CVE-2016-3707,\nModerate)\n\nRed Hat would like to thank Jann Horn for reporting CVE-2016-4565.\n\nBug Fix(es):\n\n* An oops can occur in the hpsa driver while submitting ioaccel2 commands\nwhen the phys_disk pointer is NULL (in hpsa_scsi_ioaccel_raid_map).\nConfiguration changes during I/O operations could set the phys_disk\npointer to NULL. In this case, send the command down the RAID path for\ncorrect processing, avoiding the oops. (BZ#1334260)\n\n* A faulty code merge left an extra spin_lock operation in the function\nfscache_invalidate_write(). The code has been correctly updated to remove\nthis extra lock operation, which avoids a potential deadlock situation\nwhen looping through cache pages. (BZ#1327730)",
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
            "version": "2.0"
          },
          "products": [
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel-rt: Sending SysRq command via ICMP echo request"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Jann Horn"
          ]
        }
      ],
      "cve": "CVE-2016-4565",
      "cwe": {
        "id": "CWE-119",
        "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
      },
      "discovery_date": "2016-02-19T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1310570"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way certain interfaces of the Linux kernel\u0027s Infiniband subsystem used write() as bi-directional ioctl() replacement, which could lead to insufficient memory security checks when being invoked using the splice() system call. A local unprivileged user on a system with either Infiniband hardware present or RDMA Userspace Connection Manager Access module explicitly loaded, could use this flaw to escalate their privileges on the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG-2. Future Linux kernel updates for the respective releases might address this issue.",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
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          "6Server-MRG-Realtime-2:kernel-rt-vanilla-devel-1:3.10.0-327.rt56.190.el6rt.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2016-4565"
        },
        {
          "category": "external",
          "summary": "RHBZ#1310570",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1310570"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2016-4565",
          "url": "https://www.cve.org/CVERecord?id=CVE-2016-4565"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2016-4565",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-4565"
        }
      ],
      "release_date": "2016-05-07T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2016-06-27T10:02:50+00:00",
          "details": "For details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
          "product_ids": [
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2016:1341"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.9,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
            "version": "2.0"
          },
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko"
    }
  ]
}


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