rhsa-2012_1087
Vulnerability from csaf_redhat
Published
2012-07-17 18:03
Modified
2024-11-22 05:22
Summary
Red Hat Security Advisory: kernel security and bug fix update

Notes

Topic
Updated kernel packages that fix one security issue and multiple bugs are now available for Red Hat Enterprise Linux 5.6 Extended Update Support. The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issue: * It was found that the data_len parameter of the sock_alloc_send_pskb() function in the Linux kernel's networking implementation was not validated before use. A local user with access to a TUN/TAP virtual interface could use this flaw to crash the system or, potentially, escalate their privileges. Note that unprivileged users cannot access TUN/TAP devices until the root user grants them access. (CVE-2012-2136, Important) This update also fixes the following bugs: * An insufficiently designed calculation in the CPU accelerator in the previous kernel caused an arithmetic overflow in the sched_clock() function when system uptime exceeded 208.5 days. This overflow led to a kernel panic on the systems using the Time Stamp Counter (TSC) or Virtual Machine Interface (VMI) clock source. This update corrects the described calculation so that this arithmetic overflow and kernel panic can no longer occur under these circumstances. (BZ#825981, BZ#835449) * Previously, a race condition between the journal_write_metadata_buffer() and jbd_unlock_bh_state() functions could occur. Consequently, another thread could call the get_write_access() function on the buffer head and cause the wrong data to be written into the journal. If the system terminated unexpectedly or was shut down incorrectly, subsequent file system journal replay could result in file system corruption. This update fixes the race condition and the file system corruption no longer occurs in the described scenario. (BZ#833764) * When the kvmclock initialization was used in a guest, it could write to the Time Stamp Counter (TSC) and, under certain circumstances, could cause the kernel to become unresponsive on boot. With this update, TSC synchronization, which is unnecessary due to kvmclock, has been disabled, thus fixing this bug. (BZ#834557) Users should upgrade to these updated packages, which contain backported patches to correct these issues. 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 packages that fix one security issue and multiple bugs are\nnow available for Red Hat Enterprise Linux 5.6 Extended Update Support.\n\nThe Red Hat Security Response Team has rated this update as having\nimportant security impact. A Common Vulnerability Scoring System (CVSS)\nbase score, which gives a detailed severity rating, is available from the\nCVE link in the References section.",
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        "text": "The kernel packages contain the Linux kernel, the core of any Linux\noperating system.\n\nThis update fixes the following security issue:\n\n* It was found that the data_len parameter of the sock_alloc_send_pskb()\nfunction in the Linux kernel\u0027s networking implementation was not validated\nbefore use. A local user with access to a TUN/TAP virtual interface could\nuse this flaw to crash the system or, potentially, escalate their\nprivileges. Note that unprivileged users cannot access TUN/TAP devices\nuntil the root user grants them access. (CVE-2012-2136, Important)\n\nThis update also fixes the following bugs:\n\n* An insufficiently designed calculation in the CPU accelerator in the\nprevious kernel caused an arithmetic overflow in the sched_clock() function\nwhen system uptime exceeded 208.5 days. This overflow led to a kernel panic\non the systems using the Time Stamp Counter (TSC) or Virtual Machine\nInterface (VMI) clock source. This update corrects the described\ncalculation so that this arithmetic overflow and kernel panic can no longer\noccur under these circumstances. (BZ#825981, BZ#835449)\n\n* Previously, a race condition between the journal_write_metadata_buffer()\nand jbd_unlock_bh_state() functions could occur. Consequently, another\nthread could call the get_write_access() function on the buffer head and\ncause the wrong data to be written into the journal. If the system\nterminated unexpectedly or was shut down incorrectly, subsequent file\nsystem journal replay could result in file system corruption. This update\nfixes the race condition and the file system corruption no longer occurs in\nthe described scenario. (BZ#833764)\n\n* When the kvmclock initialization was used in a guest, it could write to\nthe Time Stamp Counter (TSC) and, under certain circumstances, could cause\nthe kernel to become unresponsive on boot. With this update, TSC\nsynchronization, which is unnecessary due to kvmclock, has been disabled,\nthus fixing this bug. (BZ#834557)\n\nUsers should upgrade to these updated packages, which contain backported\npatches to correct these issues. The system must be rebooted for this\nupdate to take effect.",
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          "title": "Vulnerability description"
        },
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          "text": "kernel: net: insufficient data_len validation in sock_alloc_send_pskb()",
          "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.",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: net: insufficient data_len validation in sock_alloc_send_pskb()"
    }
  ]
}


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Sightings

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