rhsa-2015_1138
Vulnerability from csaf_redhat
Published
2015-06-23 08:28
Modified
2024-11-05 18:54
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 MRG
2.5.
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.
* It was found that the Linux kernel's implementation of vectored pipe read
and write functionality did not take into account the I/O vectors that were
already processed when retrying after a failed atomic access operation,
potentially resulting in memory corruption due to an I/O vector array
overrun. A local, unprivileged user could use this flaw to crash the system
or, potentially, escalate their privileges on the system. (CVE-2015-1805,
Important)
* A race condition flaw was found in the way the Linux kernel keys
management subsystem performed key garbage collection. A local attacker
could attempt accessing a key while it was being garbage collected, which
would cause the system to crash. (CVE-2014-9529, Moderate)
* A flaw was found in the way the Linux kernel's 32-bit emulation
implementation handled forking or closing of a task with an 'int80' entry.
A local user could potentially use this flaw to escalate their privileges
on the system. (CVE-2015-2830, Low)
* It was found that the Linux kernel's ISO file system implementation did
not correctly limit the traversal of Rock Ridge extension Continuation
Entries (CE). An attacker with physical access to the system could use this
flaw to trigger an infinite loop in the kernel, resulting in a denial of
service. (CVE-2014-9420, Low)
* An information leak flaw was found in the way the Linux kernel's ISO9660
file system implementation accessed data on an ISO9660 image with RockRidge
Extension Reference (ER) records. An attacker with physical access to the
system could use this flaw to disclose up to 255 bytes of kernel memory.
(CVE-2014-9584, Low)
* A flaw was found in the way the nft_flush_table() function of the Linux
kernel's netfilter tables implementation flushed rules that were
referencing deleted chains. A local user who has the CAP_NET_ADMIN
capability could use this flaw to crash the system. (CVE-2015-1573, Low)
* An integer overflow flaw was found in the way the Linux kernel randomized
the stack for processes on certain 64-bit architecture systems, such as
x86-64, causing the stack entropy to be reduced by four. (CVE-2015-1593,
Low)
Red Hat would like to thank Carl Henrik Lunde for reporting CVE-2014-9420
and CVE-2014-9584. The security impact of CVE-2015-1805 was discovered by
Red Hat.
This update provides a build of the kernel-rt package for Red Hat
Enterprise MRG 2.5 that is layered on Red Hat Enterprise Linux 6, and
fixes the following issues:
* storvsc: get rid of overly verbose warning messages
* storvsc: force discovery of LUNs that may have been removed
* storvsc: in responce to a scan event, scan the hos
* storvsc: NULL pointer dereference fix
* futex: Mention key referencing differences between shared and private
futexes
* futex: Ensure get_futex_key_refs() always implies a barrier
* kernel module: set nx before marking module MODULE_STATE_COMING
* kernel module: Clean up ro/nx after early module load failures
* btrfs: make xattr replace operations atomic
* megaraid_sas: revert: Add release date and update driver version
* radeon: fix kernel segfault in hwmonitor
(BZ#1223077)
Bug fix:
* There is an XFS optimization that depended on a spinlock to disable
preemption using the preempt_disable() function. When CONFIG_PREEMPT_RT is
enabled on realtime kernels, spinlocks do not disable preemption while
held, so the XFS critical section was not protected from preemption.
Systems on the Realtime kernel-rt could lock up in this XFS optimization
when a task that locked all the counters was then preempted by a realtime
task, causing all callers of that lock to block indefinitely. This update
disables the optimization when building a kernel with
CONFIG_PREEMPT_RT_FULL enabled. (BZ#1217849)
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": "The kernel-rt packages contain the Linux kernel, the core of any Linux\noperating system.\n\n* It was found that the Linux kernel\u0027s implementation of vectored pipe read\nand write functionality did not take into account the I/O vectors that were\nalready processed when retrying after a failed atomic access operation,\npotentially resulting in memory corruption due to an I/O vector array\noverrun. A local, unprivileged user could use this flaw to crash the system\nor, potentially, escalate their privileges on the system. (CVE-2015-1805,\nImportant)\n\n* A race condition flaw was found in the way the Linux kernel keys\nmanagement subsystem performed key garbage collection. A local attacker\ncould attempt accessing a key while it was being garbage collected, which\nwould cause the system to crash. (CVE-2014-9529, Moderate)\n\n* A flaw was found in the way the Linux kernel\u0027s 32-bit emulation\nimplementation handled forking or closing of a task with an \u0027int80\u0027 entry.\nA local user could potentially use this flaw to escalate their privileges\non the system. (CVE-2015-2830, Low)\n\n* It was found that the Linux kernel\u0027s ISO file system implementation did\nnot correctly limit the traversal of Rock Ridge extension Continuation\nEntries (CE). An attacker with physical access to the system could use this\nflaw to trigger an infinite loop in the kernel, resulting in a denial of\nservice. (CVE-2014-9420, Low)\n\n* An information leak flaw was found in the way the Linux kernel\u0027s ISO9660\nfile system implementation accessed data on an ISO9660 image with RockRidge\nExtension Reference (ER) records. An attacker with physical access to the\nsystem could use this flaw to disclose up to 255 bytes of kernel memory.\n(CVE-2014-9584, Low)\n\n* A flaw was found in the way the nft_flush_table() function of the Linux\nkernel\u0027s netfilter tables implementation flushed rules that were\nreferencing deleted chains. A local user who has the CAP_NET_ADMIN\ncapability could use this flaw to crash the system. (CVE-2015-1573, Low)\n\n* An integer overflow flaw was found in the way the Linux kernel randomized\nthe stack for processes on certain 64-bit architecture systems, such as\nx86-64, causing the stack entropy to be reduced by four. (CVE-2015-1593,\nLow)\n\nRed Hat would like to thank Carl Henrik Lunde for reporting CVE-2014-9420\nand CVE-2014-9584. The security impact of CVE-2015-1805 was discovered by\nRed Hat.\n\nThis update provides a build of the kernel-rt package for Red Hat\nEnterprise MRG 2.5 that is layered on Red Hat Enterprise Linux 6, and\nfixes the following issues:\n\n* storvsc: get rid of overly verbose warning messages\n* storvsc: force discovery of LUNs that may have been removed\n* storvsc: in responce to a scan event, scan the hos\n* storvsc: NULL pointer dereference fix\n* futex: Mention key referencing differences between shared and private\nfutexes\n* futex: Ensure get_futex_key_refs() always implies a barrier\n* kernel module: set nx before marking module MODULE_STATE_COMING\n* kernel module: Clean up ro/nx after early module load failures\n* btrfs: make xattr replace operations atomic\n* megaraid_sas: revert: Add release date and update driver version\n* radeon: fix kernel segfault in hwmonitor\n\n(BZ#1223077)\n\nBug fix:\n\n* There is an XFS optimization that depended on a spinlock to disable\npreemption using the preempt_disable() function. When CONFIG_PREEMPT_RT is\nenabled on realtime kernels, spinlocks do not disable preemption while\nheld, so the XFS critical section was not protected from preemption.\nSystems on the Realtime kernel-rt could lock up in this XFS optimization\nwhen a task that locked all the counters was then preempted by a realtime\ntask, causing all callers of that lock to block indefinitely. This update\ndisables the optimization when building a kernel with\nCONFIG_PREEMPT_RT_FULL enabled. (BZ#1217849)\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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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2015:1138"
}
],
"scores": [
{
"cvss_v2": {
"accessComplexity": "MEDIUM",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 1.9,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:L/AC:M/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"products": [
"6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-229.rt56.153.el6rt.src",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "kernel: int80 fork from 64-bit tasks mishandling"
}
]
}
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- 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.