rhsa-2015_1788
Vulnerability from csaf_redhat
Published
2015-09-15 09:38
Modified
2024-11-05 19:02
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 Important 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. * A flaw was found in the kernel's implementation of the Berkeley Packet Filter (BPF). A local attacker could craft BPF code to crash the system by creating a situation in which the JIT compiler would fail to correctly optimize the JIT image on the last pass. This would lead to the CPU executing instructions that were not part of the JIT code. (CVE-2015-4700, Important) * 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) * A flaw was found in the way the Linux kernel's ext4 file system handled the "page size > block size" condition when the fallocate zero range functionality was used. A local attacker could use this flaw to crash the system. (CVE-2015-0275, Moderate) * It was found that the Linux kernel's keyring implementation would leak memory when adding a key to a keyring via the add_key() function. A local attacker could use this flaw to exhaust all available memory on the system. (CVE-2015-1333, Moderate) * A race condition flaw was found in the way the Linux kernel's SCTP implementation handled Address Configuration lists when performing Address Configuration Change (ASCONF). A local attacker could use this flaw to crash the system via a race condition triggered by setting certain ASCONF options on a socket. (CVE-2015-3212, Moderate) * An information leak flaw was found in the way the Linux kernel's Virtual Dynamic Shared Object (vDSO) implementation performed address randomization. A local, unprivileged user could use this flaw to leak kernel memory addresses to user-space. (CVE-2014-9585, Low) Red Hat would like to thank Daniel Borkmann for reporting CVE-2015-4700, and Canonical for reporting the CVE-2015-1333 issue. The CVE-2015-0275 issue was discovered by Xiong Zhou of Red Hat, and the CVE-2015-3212 issue was discovered by Ji Jianwen of Red Hat Engineering. The kernel-rt packages have been upgraded to version 3.10.0-229.13.1, which provides a number of bug fixes and enhancements over the previous version, including: * Fix regression in scsi_send_eh_cmnd() * boot hangs at "Console: switching to colour dummy device 80x25" * Update tcp stack to 3.17 kernel * Missing some code from patch "(...) Fix VGA switcheroo problem related to hotplug" * ksoftirqd high CPU usage due to stray tasklet from ioatdma driver * During Live Partition Mobility (LPM) testing, RHEL 7.1 LPARs will crash in kmem_cache_alloc (BZ#1253809) This update also fixes the following bug: * The hwlat_detector.ko module samples the clock and records any intervals between reads that exceed a specified threshold. However, the module previously tracked the maximum interval seen for the "inner" interval but did not record when the "outer" interval was greater. A patch has been applied to fix this bug, and hwlat_detector.ko now correctly records if the outer interval is the maximal interval encountered during the run. (BZ#1252365) 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 Important 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* A flaw was found in the kernel\u0027s implementation of the Berkeley Packet\nFilter (BPF). A local attacker could craft BPF code to crash the system by\ncreating a situation in which the JIT compiler would fail to correctly\noptimize the JIT image on the last pass. This would lead to the CPU\nexecuting instructions that were not part of the JIT code. (CVE-2015-4700,\nImportant)\n\n* Two flaws were found in the way the Linux kernel\u0027s networking\nimplementation handled UDP packets with incorrect checksum values. A remote\nattacker could potentially use these flaws to trigger an infinite loop in\nthe kernel, resulting in a denial of service on the system, or cause a\ndenial of service in applications using the edge triggered epoll\nfunctionality. (CVE-2015-5364, CVE-2015-5366, Important)\n\n* A flaw was found in the way the Linux kernel\u0027s ext4 file system handled\nthe \"page size \u003e block size\" condition when the fallocate zero range\nfunctionality was used. A local attacker could use this flaw to crash the\nsystem. (CVE-2015-0275, Moderate)\n\n* It was found that the Linux kernel\u0027s keyring implementation would leak\nmemory when adding a key to a keyring via the add_key() function. A local\nattacker could use this flaw to exhaust all available memory on the system.\n(CVE-2015-1333, Moderate)\n\n* A race condition flaw was found in the way the Linux kernel\u0027s SCTP\nimplementation handled Address Configuration lists when performing Address\nConfiguration Change (ASCONF). A local attacker could use this flaw to\ncrash the system via a race condition triggered by setting certain ASCONF\noptions on a socket. (CVE-2015-3212, Moderate)\n\n* An information leak flaw was found in the way the Linux kernel\u0027s Virtual\nDynamic Shared Object (vDSO) implementation performed address\nrandomization. A local, unprivileged user could use this flaw to leak\nkernel memory addresses to user-space. (CVE-2014-9585, Low)\n\nRed Hat would like to thank Daniel Borkmann for reporting CVE-2015-4700,\nand Canonical for reporting the CVE-2015-1333 issue. The CVE-2015-0275\nissue was discovered by Xiong Zhou of Red Hat, and the CVE-2015-3212 issue\nwas discovered by Ji Jianwen of Red Hat Engineering.\n\nThe kernel-rt packages have been upgraded to version 3.10.0-229.13.1, which\nprovides a number of bug fixes and enhancements over the previous version,\nincluding:\n\n* Fix regression in scsi_send_eh_cmnd()\n\n* boot hangs at \"Console: switching to colour dummy device 80x25\"\n\n* Update tcp stack to 3.17 kernel\n\n* Missing some code from patch \"(...) Fix VGA switcheroo problem related to\nhotplug\"\n\n* ksoftirqd high CPU usage due to stray tasklet from ioatdma driver\n\n* During Live Partition Mobility (LPM) testing, RHEL 7.1 LPARs will crash\nin kmem_cache_alloc\n\n(BZ#1253809)\n\nThis update also fixes the following bug:\n\n* The hwlat_detector.ko module samples the clock and records any intervals\nbetween reads that exceed a specified threshold. However, the module\npreviously tracked the maximum interval seen for the \"inner\" interval but\ndid not record when the \"outer\" interval was greater. A patch has been\napplied to fix this bug, and hwlat_detector.ko now correctly records if the\nouter interval is the maximal interval encountered during the run.\n(BZ#1252365)\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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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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