rhsa-2015_1030
Vulnerability from csaf_redhat
Published
2015-05-27 12:07
Modified
2024-11-05 18:53
Summary
Red Hat Security Advisory: kernel security and bug fix update

Notes

Topic
Updated kernel packages that fix one security issue and three bugs are now available for Red Hat Enterprise Linux 6.4 Advanced Update Support. Red Hat Product Security 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. * A use-after-free flaw was found in the way the Linux kernel's SCTP implementation handled authentication key reference counting during INIT collisions. A remote attacker could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2015-1421, Important) This issue was discovered by Sun Baoliang of Red Hat. This update also fixes the following bugs: * When ARP is disabled on an interface with an ARP entry for a neighbor host present in the ARP cache, letting the cached entry expire and attempting to communicate with that neighbor host could cause the host MAC address to not be resolved correctly after ARP is enabled again on the interface. With the following workaround, the entry is not expired and the described scenario works correctly: 1) Add the maximum number of ARP entries you expect for your configuration to the proc/sys/net/ipv4/neigh/default/gc_thresh file. 2) Ensure that relevant IP addresses are put in the ARP cache when the system boots, for example by executing the following two commands: ping [IP address] -c 1 ifconfig ethX -arp (BZ#1207350) * Previously, the open() system call in some cases failed with an EBUSY error if the opened file was also being renamed at the same time. With this update, the kernel automatically retries open() when this failure occurs, and if the retry is not successful either, open() now fails with an ESTALE error. (BZ#1207813) * Previously, a race condition occurred in the build_id_cache__add_s() function, which could truncate system files. A patch has been provided to fix this bug, and system files are no longer truncated in the aforementioned scenario. (BZ#1210591) All kernel users are advised to 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 three bugs are now\navailable for Red Hat Enterprise Linux 6.4 Advanced Update Support.\n\nRed Hat Product Security has rated this update as having Important security\nimpact. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available from the CVE link in the\nReferences section.",
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        "text": "The kernel packages contain the Linux kernel, the core of any Linux\noperating system.\n\n* A use-after-free flaw was found in the way the Linux kernel\u0027s SCTP\nimplementation handled authentication key reference counting during INIT\ncollisions. A remote attacker could use this flaw to crash the system or,\npotentially, escalate their privileges on the system. (CVE-2015-1421,\nImportant)\n\nThis issue was discovered by Sun Baoliang of Red Hat.\n\nThis update also fixes the following bugs:\n\n* When ARP is disabled on an interface with an ARP entry for a neighbor\nhost present in the ARP cache, letting the cached entry expire and\nattempting to communicate with that neighbor host could cause the host MAC\naddress to not be resolved correctly after ARP is enabled again on the\ninterface. With the following workaround, the entry is not expired and the\ndescribed scenario works correctly:\n\n1) Add the maximum number of ARP entries you expect for your configuration\nto the proc/sys/net/ipv4/neigh/default/gc_thresh file.\n\n2) Ensure that relevant IP addresses are put in the ARP cache when the\nsystem boots, for example by executing the following two commands:\n\nping [IP address] -c 1\nifconfig ethX -arp\n\n(BZ#1207350)\n\n* Previously, the open() system call in some cases failed with an EBUSY\nerror if the opened file was also being renamed at the same time. With this\nupdate, the kernel automatically retries open() when this failure occurs,\nand if the retry is not successful either, open() now fails with an ESTALE\nerror. (BZ#1207813)\n\n* Previously, a race condition occurred in the build_id_cache__add_s()\nfunction, which could truncate system files. A patch has been provided to\nfix this bug, and system files are no longer truncated in the\naforementioned scenario. (BZ#1210591)\n\nAll kernel users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues. The system must be\nrebooted for this update to take effect.",
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          "title": "Vulnerability description"
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          "text": "kernel: net: slab corruption from use after free on INIT collisions",
          "title": "Vulnerability summary"
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          "text": "This issue did 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 and Red Hat Enterprise MRG 2. Future Linux kernel updates for the respective releases may address this issue.",
          "title": "Statement"
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          "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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            "6Server-optional-6.4.AUS:python-perf-0:2.6.32-358.61.1.el6.x86_64",
            "6Server-optional-6.4.AUS:python-perf-debuginfo-0:2.6.32-358.61.1.el6.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: net: slab corruption from use after free on INIT collisions"
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.