rhsa-2015_1787
Vulnerability from csaf_redhat
Published
2015-09-15 09:22
Modified
2024-11-05 19:02
Summary
Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update

Notes

Topic
Updated kernel-rt packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.
Details
The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. * Two flaws were found in the way the Linux kernel's networking implementation handled UDP packets with incorrect checksum values. A remote attacker could potentially use these flaws to trigger an infinite loop in the kernel, resulting in a denial of service on the system, or cause a denial of service in applications using the edge triggered epoll functionality. (CVE-2015-5364, CVE-2015-5366, Important) * A flaw was found in the way the Linux kernel's ext4 file system handled the "page size > block size" condition when the fallocate zero range functionality was used. A local attacker could use this flaw to crash the system. (CVE-2015-0275, Moderate) * It was found that the Linux kernel's keyring implementation would leak memory when adding a key to a keyring via the add_key() function. A local attacker could use this flaw to exhaust all available memory on the system. (CVE-2015-1333, Moderate) * A race condition flaw was found in the way the Linux kernel's SCTP implementation handled Address Configuration lists when performing Address Configuration Change (ASCONF). A local attacker could use this flaw to crash the system via a race condition triggered by setting certain ASCONF options on a socket. (CVE-2015-3212, Moderate) * An information leak flaw was found in the way the Linux kernel's Virtual Dynamic Shared Object (vDSO) implementation performed address randomization. A local, unprivileged user could use this flaw to leak kernel memory addresses to user-space. (CVE-2014-9585, Low) Red Hat would like to thank Canonical for reporting the CVE-2015-1333 issue. The CVE-2015-0275 issue was discovered by Xiong Zhou of Red Hat, and the CVE-2015-3212 issue was discovered by Ji Jianwen of Red Hat Engineering. 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 fixes the following issues: * Fix regression in scsi_send_eh_cmnd() * boot hangs at "Console: switching to colour dummy device 80x25" * Update tcp stack to 3.17 kernel * ksoftirqd high CPU usage due to stray tasklet from ioatdma driver (BZ#1245345) This update also fixes the following bugs: * The configuration option CONFIG_RTC_HCTOSYS was disabled on the realtime kernel causing the RTC clock to be adjusted with the UTC time even if the system is configured to set the RTC to the local time. By enabling the CONFIG_RTC_HCTOSYS configuration option, when the system is configured to use local time, RTC will correctly update with the local time and not try to use another timezone. (BZ#1248047) * In the realtime kernel, if a rt_mutex was taken while in interrupt context the normal priority inheritance protocol would falsely identify a deadlock and trigger a kernel crash. The patch that added the rt_mutex in this interrupt context was reverted. (BZ#1250649) All kernel-rt users are advised to upgrade to these updated packages, which correct these issues and add these enhancements. The system must be rebooted for this update to take effect.
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": "Updated kernel-rt packages that fix multiple security issues, several bugs,\nand add various enhancements are now available for Red Hat Enterprise\nLinux 7.\n\nRed Hat Product Security has rated this update as having Important security\nimpact. Common Vulnerability Scoring System (CVSS) base scores, which give\ndetailed severity ratings, are available for each vulnerability from the\nCVE links in the References section.",
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        "text": "The kernel-rt packages contain the Linux kernel, the core of any Linux\noperating system.\n\n* Two flaws were found in the way the Linux kernel\u0027s networking\nimplementation handled UDP packets with incorrect checksum values. A remote\nattacker could potentially use these flaws to trigger an infinite loop in\nthe kernel, resulting in a denial of service on the system, or cause a\ndenial of service in applications using the edge triggered epoll\nfunctionality. (CVE-2015-5364, CVE-2015-5366, Important)\n\n* A flaw was found in the way the Linux kernel\u0027s ext4 file system handled\nthe \"page size \u003e block size\" condition when the fallocate zero range\nfunctionality was used. A local attacker could use this flaw to crash the\nsystem. (CVE-2015-0275, Moderate)\n\n* It was found that the Linux kernel\u0027s keyring implementation would leak\nmemory when adding a key to a keyring via the add_key() function. A local\nattacker could use this flaw to exhaust all available memory on the system.\n(CVE-2015-1333, Moderate)\n\n* A race condition flaw was found in the way the Linux kernel\u0027s SCTP\nimplementation handled Address Configuration lists when performing Address\nConfiguration Change (ASCONF). A local attacker could use this flaw to\ncrash the system via a race condition triggered by setting certain ASCONF\noptions on a socket. (CVE-2015-3212, Moderate)\n\n* An information leak flaw was found in the way the Linux kernel\u0027s Virtual\nDynamic Shared Object (vDSO) implementation performed address\nrandomization. A local, unprivileged user could use this flaw to leak\nkernel memory addresses to user-space. (CVE-2014-9585, Low)\n\nRed Hat would like to thank Canonical for reporting the CVE-2015-1333\nissue. The CVE-2015-0275 issue was discovered by Xiong Zhou of Red Hat, and\nthe CVE-2015-3212 issue was discovered by Ji Jianwen of Red Hat\nEngineering.\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 fixes\nthe following issues:\n\n* Fix regression in scsi_send_eh_cmnd()\n\n* boot hangs at \"Console: switching to colour dummy device 80x25\"\n\n* Update tcp stack to 3.17 kernel\n\n* ksoftirqd high CPU usage due to stray tasklet from ioatdma driver\n\n(BZ#1245345)\n\nThis update also fixes the following bugs:\n\n* The configuration option CONFIG_RTC_HCTOSYS was disabled on the realtime\nkernel causing the RTC clock to be adjusted with the UTC time even if the\nsystem is configured to set the RTC to the local time. By enabling the\nCONFIG_RTC_HCTOSYS configuration option, when the system is configured to\nuse local time, RTC will correctly update with the local time and not try\nto use another timezone. (BZ#1248047)\n\n* In the realtime kernel, if a rt_mutex was taken while in interrupt\ncontext the normal priority inheritance protocol would falsely identify a\ndeadlock and trigger a kernel crash. The patch that added the rt_mutex in\nthis interrupt context was reverted. (BZ#1250649)\n\nAll kernel-rt users are advised to upgrade to these updated packages, which\ncorrect these issues and add these enhancements. The system must be\nrebooted for this update to take effect.",
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        },
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            "authentication": "NONE",
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            "baseScore": 7.1,
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            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
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      "title": "kernel: net: incorrect processing of checksums in UDP implementation"
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      "cwe": {
        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
      },
      "discovery_date": "2015-07-01T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way the Linux kernel\u0027s networking implementation handled UDP packets with incorrect checksum values. A remote attacker could potentially use this flaw to trigger an infinite loop in the kernel, resulting in a denial of service on the system, or cause a denial of service in applications using the edge triggered epoll functionality.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: net: incorrect processing of checksums in UDP implementation",
          "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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      ],
      "title": "kernel: net: incorrect processing of checksums in UDP implementation"
    }
  ]
}


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