rhsa-2016_1096
Vulnerability from csaf_redhat
Published
2016-05-23 12:54
Modified
2024-11-14 15:36
Summary
Red Hat Security Advisory: kernel security and bug fix update

Notes

Topic
An update for kernel is now available for Red Hat Enterprise Linux 6.4 Advanced Update Support. 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 packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * 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) Bug Fix(es): * Prior to this update, if processes that generate interrupts were active during the guest shutdown sequence, the virtio driver in some cases did not correctly clear the interrupts. As a consequence, the guest kernel became unresponsive, which prevented the shutdown from completing. With this update, the virtio driver processes interrupts more effectively, and guests now shut down reliably in the described scenario. (BZ#1323568) * At a process or thread exit, when the Linux kernel undoes any SysV semaphore operations done previously (the ones done using semop with the SEM_UNDO flag), there was a possible flaw and race with another process or thread removing the same semaphore set where the operations occurred, leading to possible use of in-kernel-freed memory and then to possible unpredictable behavior. This bug could be noticed with software which uses IPC SysV semaphores, such as IBM DB2, which for example in certain cases could lead to some of its processes or utilities to get incorrectly stalled in some IPC semaphore operation or syscall after the race or problem happened. A patch has been provided to fix this bug, and the kernel now behaves as expected in the aforementioned scenario. (BZ#1326341)
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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        "text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* Two flaws were found in the way the Linux kernel\u0027s 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)\n\nBug Fix(es):\n\n* Prior to this update, if processes that generate interrupts were active during the guest shutdown sequence, the virtio driver in some cases did not correctly clear the interrupts. As a consequence, the guest kernel became unresponsive, which prevented the shutdown from completing. With this update, the virtio driver processes interrupts more effectively, and guests now shut down reliably in the described scenario. (BZ#1323568)\n\n* At a process or thread exit, when the Linux kernel undoes any SysV semaphore operations done previously (the ones done using semop with the SEM_UNDO flag), there was a possible flaw and race with another process or thread removing the same semaphore set where the operations occurred, leading to possible use of in-kernel-freed memory and then to possible unpredictable behavior. This bug could be noticed with software which uses IPC SysV semaphores, such as IBM DB2, which for example in certain cases could lead to some of its processes or utilities to get incorrectly stalled in some IPC semaphore operation or syscall after the race or problem happened. A patch has been provided to fix this bug, and the kernel now behaves as expected in the aforementioned scenario. (BZ#1326341)",
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          "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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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2015-5366"
        },
        {
          "category": "external",
          "summary": "RHBZ#1239029",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1239029"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2015-5366",
          "url": "https://www.cve.org/CVERecord?id=CVE-2015-5366"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2015-5366",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2015-5366"
        }
      ],
      "release_date": "2015-07-01T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2016-05-23T12:54:16+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 7.1,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: net: incorrect processing of checksums in UDP implementation"
    }
  ]
}


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