rhsa-2016_1875
Vulnerability from csaf_redhat
Published
2016-09-15 07:39
Modified
2024-11-05 19:27
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Notes
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
The kernel-rt packages have been upgraded to the kernel-3.10.0-327.36.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1366538)
Security Fix(es):
* A security flaw was found in the Linux kernel in the mark_source_chains() function in "net/ipv4/netfilter/ip_tables.c". It is possible for a user-supplied "ipt_entry" structure to have a large "next_offset" field. This field is not bounds checked prior to writing to a counter value at the supplied offset. (CVE-2016-3134, Important)
* A flaw was discovered in processing setsockopt for 32 bit processes on 64 bit systems. This flaw will allow attackers to alter arbitrary kernel memory when unloading a kernel module. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges. (CVE-2016-4997, Important)
* An out-of-bounds heap memory access leading to a Denial of Service, heap disclosure, or further impact was found in setsockopt(). The function call is normally restricted to root, however some processes with cap_sys_admin may also be able to trigger this flaw in privileged container environments. (CVE-2016-4998, Moderate)
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 provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nThe kernel-rt packages have been upgraded to the kernel-3.10.0-327.36.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1366538)\n\nSecurity Fix(es):\n\n* A security flaw was found in the Linux kernel in the mark_source_chains() function in \"net/ipv4/netfilter/ip_tables.c\". It is possible for a user-supplied \"ipt_entry\" structure to have a large \"next_offset\" field. This field is not bounds checked prior to writing to a counter value at the supplied offset. (CVE-2016-3134, Important)\n\n* A flaw was discovered in processing setsockopt for 32 bit processes on 64 bit systems. This flaw will allow attackers to alter arbitrary kernel memory when unloading a kernel module. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges. (CVE-2016-4997, Important)\n\n* An out-of-bounds heap memory access leading to a Denial of Service, heap disclosure, or further impact was found in setsockopt(). The function call is normally restricted to root, however some processes with cap_sys_admin may also be able to trigger this flaw in privileged container environments. (CVE-2016-4998, Moderate)",
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"text": "A security flaw was found in the Linux kernel in the mark_source_chains() function in \"net/ipv4/netfilter/ip_tables.c\". It is possible for a user-supplied \"ipt_entry\" structure to have a large \"next_offset\" field. This field is not bounds checked prior to writing to a counter value at the supplied offset.",
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"text": "kernel: netfilter: missing bounds check in ipt_entry structure",
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"text": "This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6. This issue is not currently planned to be addressed in future updates, as user namespaces which the flaw affects are not supported in these products. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.",
"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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"name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)"
},
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1355654"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found that the vfs_rename() function did not detect hard links on overlayfs. A local, unprivileged user could use the rename syscall on overlayfs on top of xfs to crash the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: vfs: missing detection of hardlinks in vfs_rename() on overlayfs",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue is not present in the Linux kernel packages as shipped with Red Hat Enterprise Linux versions 5 and 6.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.",
"title": "Statement"
},
{
"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.",
"title": "CVSS score applicability"
}
],
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2016-6198"
}
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{
"category": "vendor_fix",
"date": "2016-09-15T07:39:21+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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Loading...
Loading...
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.