rhsa-2015_1565
Vulnerability from csaf_redhat
Published
2015-08-05 20:13
Modified
2024-09-13 10:37
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 Moderate 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. * An integer overflow flaw was found in the way the Linux kernel's netfilter connection tracking implementation loaded extensions. An attacker on a local network could potentially send a sequence of specially crafted packets that would initiate the loading of a large number of extensions, causing the targeted system in that network to crash. (CVE-2014-9715, Moderate) * A stack-based buffer overflow flaw was found in the Linux kernel's early load microcode functionality. On a system with UEFI Secure Boot enabled, a local, privileged user could use this flaw to increase their privileges to the kernel (ring0) level, bypassing intended restrictions in place. (CVE-2015-2666, Moderate) * It was found that the Linux kernel's ping socket implementation did not properly handle socket unhashing during spurious disconnects, which could lead to a use-after-free flaw. On x86-64 architecture systems, a local user able to create ping sockets could use this flaw to crash the system. On non-x86-64 architecture systems, a local user able to create ping sockets could use this flaw to escalate their privileges on the system. (CVE-2015-3636, Moderate) * It was found that the Linux kernel's TCP/IP protocol suite implementation for IPv6 allowed the Hop Limit value to be set to a smaller value than the default one. An attacker on a local network could use this flaw to prevent systems on that network from sending or receiving network packets. (CVE-2015-2922, Low) Red Hat would like to thank Nathan Hoad for reporting the CVE-2014-9715 issue. The kernel-rt packages have been upgraded to version 3.10.0-229.11.1, which provides a number of bug fixes and enhancements over the previous version, including: * drbg: Add stdrng alias and increase priority * seqiv / eseqiv / chainiv: Move IV seeding into init function * ipv4: kABI fix for 0bbf87d backport * ipv4: Convert ipv4.ip_local_port_range to be per netns * libceph: tcp_nodelay support * ipr: Increase default adapter init stage change timeout * fix use-after-free bug in usb_hcd_unlink_urb() * libceph: fix double __remove_osd() problem * ext4: fix data corruption caused by unwritten and delayed extents * sunrpc: Add missing support for RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT * nfs: Fixing lease renewal (Benjamin Coddington) * control hard lockup detection default * Fix print-once on enable * watchdog: update watchdog_thresh properly and watchdog attributes atomically * module: Call module notifier on failure after complete_formation() (BZ#1234470) This update also fixes the following bugs: * The megasas driver used the smp_processor_id() function within a preemptible context, which caused warning messages to be returned to the console. The function has been changed to raw_smp_processor_id() so that a lock is held while getting the processor ID. As a result, correct operations are now allowed without any console warnings being produced. (BZ#1235304) * In the NFSv4 file system, non-standard usage of the write_seqcount_{begin,end}() functions were used, which caused the realtime code to try to sleep while locks were held. As a consequence, the "scheduling while atomic" error messages were returned. The underlying source code has been modified to use the __write_seqcount_{begin,end}() functions that do not hold any locks, allowing correct execution of realtime. (BZ#1235301) 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 Moderate 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* An integer overflow flaw was found in the way the Linux kernel\u0027s\nnetfilter connection tracking implementation loaded extensions. An attacker\non a local network could potentially send a sequence of specially crafted\npackets that would initiate the loading of a large number of extensions,\ncausing the targeted system in that network to crash. (CVE-2014-9715,\nModerate)\n\n* A stack-based buffer overflow flaw was found in the Linux kernel\u0027s early\nload microcode functionality. On a system with UEFI Secure Boot enabled, a\nlocal, privileged user could use this flaw to increase their privileges to\nthe kernel (ring0) level, bypassing intended restrictions in place.\n(CVE-2015-2666, Moderate)\n\n* It was found that the Linux kernel\u0027s ping socket implementation did not\nproperly handle socket unhashing during spurious disconnects, which could\nlead to a use-after-free flaw. On x86-64 architecture systems, a local user\nable to create ping sockets could use this flaw to crash the system.\nOn non-x86-64 architecture systems, a local user able to create ping\nsockets could use this flaw to escalate their privileges on the system.\n(CVE-2015-3636, Moderate)\n\n* It was found that the Linux kernel\u0027s TCP/IP protocol suite implementation\nfor IPv6 allowed the Hop Limit value to be set to a smaller value than the\ndefault one. An attacker on a local network could use this flaw to prevent\nsystems on that network from sending or receiving network packets.\n(CVE-2015-2922, Low)\n\nRed Hat would like to thank Nathan Hoad for reporting the CVE-2014-9715\nissue.\n\nThe kernel-rt packages have been upgraded to version 3.10.0-229.11.1, which\nprovides a number of bug fixes and enhancements over the previous version,\nincluding:\n\n* drbg: Add stdrng alias and increase priority\n* seqiv / eseqiv / chainiv: Move IV seeding into init function\n* ipv4: kABI fix for 0bbf87d backport\n* ipv4: Convert ipv4.ip_local_port_range to be per netns\n* libceph: tcp_nodelay support\n* ipr: Increase default adapter init stage change timeout\n* fix use-after-free bug in usb_hcd_unlink_urb()\n* libceph: fix double __remove_osd() problem\n* ext4: fix data corruption caused by unwritten and delayed extents\n* sunrpc: Add missing support for RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT\n* nfs: Fixing lease renewal (Benjamin Coddington)\n* control hard lockup detection default\n* Fix print-once on enable\n* watchdog: update watchdog_thresh properly and watchdog attributes\n  atomically\n* module: Call module notifier on failure after complete_formation()\n\n(BZ#1234470)\n\nThis update also fixes the following bugs:\n\n* The megasas driver used the smp_processor_id() function within a\npreemptible context, which caused warning messages to be returned to the\nconsole. The function has been changed to raw_smp_processor_id() so that a\nlock is held while getting the processor ID. As a result, correct\noperations are now allowed without any console warnings being produced.\n(BZ#1235304)\n\n* In the NFSv4 file system, non-standard usage of the\nwrite_seqcount_{begin,end}() functions were used, which caused the realtime\ncode to try to sleep while locks were held. As a consequence, the\n\"scheduling while atomic\" error messages were returned. The underlying\nsource code has been modified to use the __write_seqcount_{begin,end}()\nfunctions that do not hold any locks, allowing correct execution of\nrealtime. (BZ#1235301)\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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        "id": "CWE-416",
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          "text": "It was found that the Linux kernel\u0027s ping socket implementation did not properly handle socket unhashing during spurious disconnects, which could lead to a use-after-free flaw. On x86-64 architecture systems, a local user able to create ping sockets could use this flaw to crash the system. On non-x86-64 architecture systems, a local user able to create ping sockets could use this flaw to escalate their privileges on the system.",
          "title": "Vulnerability description"
        },
        {
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          "text": "kernel: ping sockets: use-after-free leading to local privilege escalation",
          "title": "Vulnerability summary"
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        {
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          "text": "This issue does not affect the Linux kernel as shipped with Red Hat Enterprise Linux 5. This issue does affect the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for the respective releases will address this issue.\n\nPlease note that on x86-64 architecture systems the impact is limited to local Denial of Service and that the ping sockets functionality is disabled by default (net.ipv4.ping_group_range sysctl is \"1\t0\").",
          "title": "Statement"
        },
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          "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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  ]
}


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