RHSA-2016:2074
Vulnerability from csaf_redhat - Published: 2016-10-18 11:09 - Updated: 2026-02-26 20:21Summary
Red Hat Security Advisory: kernel security and bug fix update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 6.5 Advanced Update Support.
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 packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialized variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470, Important)
This issue was discovered by David Howells (Red Hat Inc.).
Bug Fix(es):
* Previously, the BUG_ON() signal appeared in the fs_clear_inode() function where the nfs_have_writebacks() function reported a positive value for nfs_inode->npages. As a consequence, a kernel panic occurred. This update performs a serialization by holding the inode i_lock over the check of PagePrivate and locking the request, which fixes this bug. (BZ#1365161)
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.
A flaw was found in the Linux kernel's keyring handling code: the key_reject_and_link() function could be forced to free an arbitrary memory block. An attacker could use this flaw to trigger a use-after-free condition on the system, potentially allowing for privilege escalation.
7.8 (High)
Affected products
Fixed
32 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-6.5.AUS:kernel-0:2.6.32-431.74.1.el6.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-abi-whitelists-0:2.6.32-431.74.1.el6.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-debug-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-debug-debuginfo-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-debug-devel-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-debuginfo-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-debuginfo-common-x86_64-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-devel-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-doc-0:2.6.32-431.74.1.el6.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-firmware-0:2.6.32-431.74.1.el6.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:kernel-headers-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:perf-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:perf-debuginfo-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:python-perf-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-6.5.AUS:python-perf-debuginfo-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-0:2.6.32-431.74.1.el6.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-abi-whitelists-0:2.6.32-431.74.1.el6.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-debug-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-debug-debuginfo-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-debug-devel-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-debuginfo-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-debuginfo-common-x86_64-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-devel-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-doc-0:2.6.32-431.74.1.el6.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-firmware-0:2.6.32-431.74.1.el6.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:kernel-headers-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:perf-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:perf-debuginfo-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:python-perf-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-optional-6.5.AUS:python-perf-debuginfo-0:2.6.32-431.74.1.el6.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
References
8 references
Acknowledgments
Red Hat
David Howells
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"text": "A flaw was found in the Linux kernel\u0027s keyring handling code: the key_reject_and_link() function could be forced to free an arbitrary memory block. An attacker could use this flaw to trigger a use-after-free condition on the system, potentially allowing for privilege escalation.",
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"text": "kernel: Uninitialized variable in request_key handling causes kernel crash in error handling path",
"title": "Vulnerability summary"
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{
"category": "other",
"text": "This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 6 and may be addressed in a future update.\n\nThis issue does not affect the Linux kernel packages as shipped with Red Hat\nEnterprise Linux 7 and Red Hat Enterprise MRG 2 as the due updates to fix\nthis issue have been shipped now.",
"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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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2016:2074"
}
],
"scores": [
{
"cvss_v2": {
"accessComplexity": "MEDIUM",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 6.9,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: Uninitialized variable in request_key handling causes kernel crash in error handling path"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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