rhsa-2017_0113
Vulnerability from csaf_redhat
Published
2017-01-17 17:47
Modified
2024-09-13 14:38
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 packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. The kernel-rt packages have been upgraded to version 3.10.0-514, which provides a number of security and bug fixes over the previous version. (BZ#1400193) Security Fix(es): * A use-after-free vulnerability was found in the kernel's socket recvmmsg subsystem. This may allow remote attackers to corrupt memory and may allow execution of arbitrary code. This corruption takes place during the error handling routines within __sys_recvmmsg() function. (CVE-2016-7117, Important) * A use-after-free vulnerability was found in tcp_xmit_retransmit_queue and other tcp_* functions. This condition could allow an attacker to send an incorrect selective acknowledgment to existing connections, possibly resetting a connection. (CVE-2016-6828, Moderate) * A flaw was found in the Linux kernel's implementation of sctp protocol in which a remote attacker can trigger an out of bounds read with an offset of up to 64kB. This may panic the machine with a page-fault. (CVE-2016-9555, Moderate) Bug Fix(es): * Previously, console warnings from the real-time kernel were generated when a sleeping lock was acquired in atomic context. With this update, the code has been modified to not acquire a sleeping lock in this context. As a result, the console warnings are no longer generated. (BZ#1378982) * Previously, the device mapper (DM) subsystem was not notified that the real-time kernel changes the way preemption works with spinlocks. This caused a kernel panic when the dm-multipath kernel module was loaded because the interrupt request (IRQ) check was invalid on the real-time kernel. This check has been corrected enabling the system to boot correctly with the dm-multipath module enabled. (BZ#1400305) * Previously, the kernel could sometimes panic due to a possible division by zero in the scheduler. This bug has been fixed by defining a new div64_ul() division function and correcting the affected calculation in the proc_sched_show_task() function. (BZ#1400975) * Unlike the standard Linux kernel, the real-time kernel does not disable interrupts inside the Interrupt Service Routines driver. Because of this difference, a New API (NAPI) function for turning interrupt requests (IRQ) off was actually being called with IRQs enabled. Consequently, the NAPI poll list was being corrupted, causing improper networking card operation and potential kernel hangs. With this update, the NAPI function has been corrected to force modifications of the poll list to be protected allowing proper operation of the networking card drivers. (BZ#1401779) Enhancement(s): * With this update, the CONFIG_SLUB_DEBUG and CONFIG_SLABINFO kernel configuration options are enabled in the real-time kernel. These options turn on SLUB allocator debugging and slab information tracking, which are helpful when investigating kernel memory allocation problems. (BZ#1357997)
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-rt is now available for Red Hat Enterprise MRG 2.5.\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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nThe kernel-rt packages have been upgraded to version 3.10.0-514, which provides a number of security and bug fixes over the previous version. (BZ#1400193)\n\nSecurity Fix(es):\n\n* A use-after-free vulnerability was found in the kernel\u0027s socket recvmmsg subsystem. This may allow remote attackers to corrupt memory and may allow execution of arbitrary code. This corruption takes place during the error handling routines within __sys_recvmmsg() function. (CVE-2016-7117, Important)\n\n* A use-after-free vulnerability was found in tcp_xmit_retransmit_queue and other tcp_* functions. This condition could allow an attacker to send an incorrect selective acknowledgment to existing connections, possibly resetting a connection. (CVE-2016-6828, Moderate)\n\n* A flaw was found in the Linux kernel\u0027s implementation of sctp protocol in which a remote attacker can trigger an out of bounds read with an offset of up to 64kB. This may panic the machine with a page-fault. (CVE-2016-9555, Moderate)\n\nBug Fix(es):\n\n* Previously, console warnings from the real-time kernel were generated when a sleeping lock was acquired in atomic context. With this update, the code has been modified to not acquire a sleeping lock in this context. As a result, the console warnings are no longer generated. (BZ#1378982)\n\n* Previously, the device mapper (DM) subsystem was not notified that the real-time kernel changes the way preemption works with spinlocks. This caused a kernel panic when the dm-multipath kernel module was loaded because the interrupt request (IRQ) check was invalid on the real-time kernel. This check has been corrected enabling the system to boot correctly with the dm-multipath module enabled. (BZ#1400305)\n\n* Previously, the kernel could sometimes panic due to a possible division by zero in the scheduler. This bug has been fixed by defining a new div64_ul() division function and correcting the affected calculation in the proc_sched_show_task() function. (BZ#1400975)\n\n* Unlike the standard Linux kernel, the real-time kernel does not disable interrupts inside the Interrupt Service Routines driver. Because of this difference, a New API (NAPI) function for turning interrupt requests (IRQ) off was actually being called with IRQs enabled. Consequently, the NAPI poll list was being corrupted, causing improper networking card operation and potential kernel hangs. With this update, the NAPI function has been corrected to force modifications of the poll list to be protected allowing proper operation of the networking card drivers. (BZ#1401779)\n\nEnhancement(s):\n\n* With this update, the CONFIG_SLUB_DEBUG and CONFIG_SLABINFO kernel configuration options are enabled in the real-time kernel. These options turn on SLUB allocator debugging and slab information tracking, which are helpful when investigating kernel memory allocation problems. (BZ#1357997)",
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      "title": "kernel: Use-after-free in the recvmmsg exit path"
    },
    {
      "cve": "CVE-2016-9555",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2016-11-22T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1397930"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s implementation of the SCTP protocol. A remote attacker could trigger an out-of-bounds read with an offset of up to 64kB potentially causing the system to crash.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Slab out-of-bounds access in sctp_sf_ootb()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 5, 6, 7, MRG-2 and realtime and will be addressed in future updates.",
          "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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          "category": "description",
          "text": "A race condition was found in the Linux kernel\u0027s sound timer code in the snd_timer_user_read() function in the sound/core/timer.c file. An unprivileged attacker can exploit the race condition to cause an out-of-bound access which may lead to a system crash or other unspecified impact.  Due to the nature of the flaw, privilege escalation cannot be fully ruled out.",
          "title": "Vulnerability description"
        },
        {
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          "text": "kernel: sound: a race condition in the kernel sound timer in snd_timer_user_read()",
          "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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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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      "title": "kernel: sound: a race condition in the kernel sound timer in snd_timer_user_read()"
    }
  ]
}


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