rhsa-2011_1813
Vulnerability from csaf_redhat
Published
2011-12-13 21:27
Modified
2024-09-15 19:20
Summary
Red Hat Security Advisory: kernel security and bug fix update
Notes
Topic
Updated kernel packages that fix several security issues and various bugs
are now available for Red Hat Enterprise Linux 5.6 Extended Update Support.
The Red Hat Security Response Team 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
These packages contain the Linux kernel.
This update fixes the following security issues:
* A flaw in the Stream Control Transmission Protocol (SCTP) implementation
could allow a remote attacker to cause a denial of service by sending a
specially-crafted SCTP packet to a target system. (CVE-2011-2482,
Important)
If you do not run applications that use SCTP, you can prevent the sctp
module from being loaded by adding the following to the end of the
"/etc/modprobe.d/blacklist.conf" file:
blacklist sctp
This way, the sctp module cannot be loaded accidentally, which may occur
if an application that requires SCTP is started. A reboot is not necessary
for this change to take effect.
* A flaw in the client-side NFS Lock Manager (NLM) implementation could
allow a local, unprivileged user to cause a denial of service.
(CVE-2011-2491, Important)
* Flaws in the netlink-based wireless configuration interface could allow
a local user, who has the CAP_NET_ADMIN capability, to cause a denial of
service or escalate their privileges on systems that have an active
wireless interface. (CVE-2011-2517, Important)
* A flaw was found in the way the Linux kernel's Xen hypervisor
implementation emulated the SAHF instruction. When using a
fully-virtualized guest on a host that does not use hardware assisted
paging (HAP), such as those running CPUs that do not have support for (or
those that have it disabled) Intel Extended Page Tables (EPT) or AMD
Virtualization (AMD-V) Rapid Virtualization Indexing (RVI), a privileged
guest user could trigger this flaw to cause the hypervisor to crash.
(CVE-2011-2519, Moderate)
* A flaw in the __addr_ok() macro in the Linux kernel's Xen hypervisor
implementation when running on 64-bit systems could allow a privileged
guest user to crash the hypervisor. (CVE-2011-2901, Moderate)
* /proc/[PID]/io is world-readable by default. Previously, these files
could be read without any further restrictions. A local, unprivileged user
could read these files, belonging to other, possibly privileged processes
to gather confidential information, such as the length of a password used
in a process. (CVE-2011-2495, Low)
Red Hat would like to thank Vasily Averin for reporting CVE-2011-2491, and
Vasiliy Kulikov of Openwall for reporting CVE-2011-2495.
This update also fixes the following bugs:
* On Broadcom PCI cards that use the tg3 driver, the operational state of a
network device, represented by the value in
"/sys/class/net/ethX/operstate", was not initialized by default.
Consequently, the state was reported as "unknown" when the tg3 network
device was actually in the "up" state. This update modifies the tg3 driver
to properly set the operstate value. (BZ#744699)
* A KVM (Kernel-based Virtual Machine) guest can get preempted by the host,
when a higher priority process needs to run. When a guest is not running
for several timer interrupts in a row, ticks could be lost, resulting in
the jiffies timer advancing slower than expected and timeouts taking longer
than expected. To correct for the issue of lost ticks,
do_timer_tsc_timekeeping() checks a reference clock source (kvm-clock when
running as a KVM guest) to see if timer interrupts have been missed. If so,
jiffies is incremented by the number of missed timer interrupts, ensuring
that programs are woken up on time. (BZ#747874)
* When a block device object was allocated, the bd_super field was not
being explicitly initialized to NULL. Previously, users of the block device
object could set bd_super to NULL when the object was released by calling
the kill_block_super() function. Certain third-party file systems do not
always use this function, and bd_super could therefore become uninitialized
when the object was allocated again. This could cause a kernel panic in the
blkdev_releasepage() function, when the uninitialized bd_super field was
dereferenced. Now, bd_super is properly initialized in the bdget()
function, and the kernel panic no longer occurs. (BZ#751137)
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": "These packages contain the Linux kernel.\n\nThis update fixes the following security issues:\n\n* A flaw in the Stream Control Transmission Protocol (SCTP) implementation\ncould allow a remote attacker to cause a denial of service by sending a\nspecially-crafted SCTP packet to a target system. (CVE-2011-2482,\nImportant)\n\nIf you do not run applications that use SCTP, you can prevent the sctp\nmodule from being loaded by adding the following to the end of the\n\"/etc/modprobe.d/blacklist.conf\" file:\n\nblacklist sctp\n\nThis way, the sctp module cannot be loaded accidentally, which may occur\nif an application that requires SCTP is started. A reboot is not necessary\nfor this change to take effect.\n\n* A flaw in the client-side NFS Lock Manager (NLM) implementation could\nallow a local, unprivileged user to cause a denial of service.\n(CVE-2011-2491, Important)\n\n* Flaws in the netlink-based wireless configuration interface could allow\na local user, who has the CAP_NET_ADMIN capability, to cause a denial of\nservice or escalate their privileges on systems that have an active\nwireless interface. (CVE-2011-2517, Important)\n\n* A flaw was found in the way the Linux kernel\u0027s Xen hypervisor\nimplementation emulated the SAHF instruction. When using a\nfully-virtualized guest on a host that does not use hardware assisted\npaging (HAP), such as those running CPUs that do not have support for (or\nthose that have it disabled) Intel Extended Page Tables (EPT) or AMD\nVirtualization (AMD-V) Rapid Virtualization Indexing (RVI), a privileged\nguest user could trigger this flaw to cause the hypervisor to crash.\n(CVE-2011-2519, Moderate)\n\n* A flaw in the __addr_ok() macro in the Linux kernel\u0027s Xen hypervisor\nimplementation when running on 64-bit systems could allow a privileged\nguest user to crash the hypervisor. (CVE-2011-2901, Moderate)\n\n* /proc/[PID]/io is world-readable by default. Previously, these files\ncould be read without any further restrictions. A local, unprivileged user\ncould read these files, belonging to other, possibly privileged processes\nto gather confidential information, such as the length of a password used\nin a process. (CVE-2011-2495, Low)\n\nRed Hat would like to thank Vasily Averin for reporting CVE-2011-2491, and\nVasiliy Kulikov of Openwall for reporting CVE-2011-2495.\n\nThis update also fixes the following bugs:\n\n* On Broadcom PCI cards that use the tg3 driver, the operational state of a\nnetwork device, represented by the value in\n\"/sys/class/net/ethX/operstate\", was not initialized by default.\nConsequently, the state was reported as \"unknown\" when the tg3 network\ndevice was actually in the \"up\" state. This update modifies the tg3 driver\nto properly set the operstate value. (BZ#744699)\n\n* A KVM (Kernel-based Virtual Machine) guest can get preempted by the host,\nwhen a higher priority process needs to run. When a guest is not running\nfor several timer interrupts in a row, ticks could be lost, resulting in\nthe jiffies timer advancing slower than expected and timeouts taking longer\nthan expected. To correct for the issue of lost ticks,\ndo_timer_tsc_timekeeping() checks a reference clock source (kvm-clock when\nrunning as a KVM guest) to see if timer interrupts have been missed. If so,\njiffies is incremented by the number of missed timer interrupts, ensuring\nthat programs are woken up on time. (BZ#747874)\n\n* When a block device object was allocated, the bd_super field was not\nbeing explicitly initialized to NULL. Previously, users of the block device\nobject could set bd_super to NULL when the object was released by calling\nthe kill_block_super() function. Certain third-party file systems do not\nalways use this function, and bd_super could therefore become uninitialized\nwhen the object was allocated again. This could cause a kernel panic in the\nblkdev_releasepage() function, when the uninitialized bd_super field was\ndereferenced. Now, bd_super is properly initialized in the bdget()\nfunction, and the kernel panic no longer occurs. (BZ#751137)",
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"text": "kernel: sctp dos",
"title": "Vulnerability summary"
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"text": "This issue did not affect the Linux kernel as shipped with Red Hat Enterprise Linux 4 as it did not backport the upstream commit 3ab224be6d6. It did not affect the Linux kernels as shipped with Red Hat Enterprise Linux 6, and Red Hat Enterprise MRG as they have backported the upstream commit ea2bc483ff5 that Red Hat Enterprise Linux 5 did not. This has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2011-1212.html.",
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},
{
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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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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: sctp dos"
},
{
"acknowledgments": [
{
"names": [
"Vasily Averin"
]
}
],
"cve": "CVE-2011-2491",
"discovery_date": "2011-06-01T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "709393"
}
],
"notes": [
{
"category": "description",
"text": "The Network Lock Manager (NLM) protocol implementation in the NFS client functionality in the Linux kernel before 3.0 allows local users to cause a denial of service (system hang) via a LOCK_UN flock system call.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: rpc task leak after flock()ing NFS share",
"title": "Vulnerability summary"
},
{
"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"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2011-2491"
},
{
"category": "external",
"summary": "RHBZ#709393",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=709393"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2011-2491",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-2491"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-2491",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2011-2491"
}
],
"release_date": "2011-05-31T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Users should upgrade to these updated packages, which contain\nbackported patches to resolve these issues. The system must be\nrebooted for this update to take effect.\n\nBefore applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259\n\nTo install kernel packages manually, use \"rpm -ivh [package]\". Do not\nuse \"rpm -Uvh\" as that will remove the running kernel binaries from\nyour system. You may use \"rpm -e\" to remove old kernels after\ndetermining that the new kernel functions properly on your system.",
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{
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"accessVector": "LOCAL",
"authentication": "NONE",
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"baseScore": 4.9,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C",
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: rpc task leak after flock()ing NFS share"
},
{
"acknowledgments": [
{
"names": [
"Vasiliy Kulikov"
],
"organization": "Openwall"
}
],
"cve": "CVE-2011-2495",
"discovery_date": "2011-06-21T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "716825"
}
],
"notes": [
{
"category": "description",
"text": "fs/proc/base.c in the Linux kernel before 2.6.39.4 does not properly restrict access to /proc/#####/io files, which allows local users to obtain sensitive I/O statistics by polling a file, as demonstrated by discovering the length of another user\u0027s password.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: /proc/PID/io infoleak",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This has been addressed in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1212.html, https://rhn.redhat.com/errata/RHSA-2011-1189.html, and https://rhn.redhat.com/errata/RHSA-2011-1253.html. Red Hat Enterprise Linux 4 is now in Production 3 of the maintenance life-cycle, https://access.redhat.com/support/policy/updates/errata/, therefore the fix for this issue is not currently planned to be included in the future updates.",
"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"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2011-2495"
},
{
"category": "external",
"summary": "RHBZ#716825",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=716825"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2011-2495",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-2495"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-2495",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2011-2495"
}
],
"release_date": "2011-06-21T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Users should upgrade to these updated packages, which contain\nbackported patches to resolve these issues. The system must be\nrebooted for this update to take effect.\n\nBefore applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259\n\nTo install kernel packages manually, use \"rpm -ivh [package]\". Do not\nuse \"rpm -Uvh\" as that will remove the running kernel binaries from\nyour system. You may use \"rpm -e\" to remove old kernels after\ndetermining that the new kernel functions properly on your system.",
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{
"cvss_v2": {
"accessComplexity": "LOW",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 2.1,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N",
"version": "2.0"
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"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "kernel: /proc/PID/io infoleak"
},
{
"cve": "CVE-2011-2517",
"discovery_date": "2011-06-11T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "718152"
}
],
"notes": [
{
"category": "description",
"text": "Multiple buffer overflows in net/wireless/nl80211.c in the Linux kernel before 2.6.39.2 allow local users to gain privileges by leveraging the CAP_NET_ADMIN capability during scan operations with a long SSID value.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: nl80211: missing check for valid SSID size in scan operations",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue did not affect the versions of Linux kernel as shipped with Red Hat\nEnterprise Linux 4 as it did not provide support for the Linux wireless LAN (802.11) configuration API. This has been addressed in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1212.html, https://rhn.redhat.com/errata/RHSA-2011-1189.html, and https://rhn.redhat.com/errata/RHSA-2011-1253.html.",
"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"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2011-2517"
},
{
"category": "external",
"summary": "RHBZ#718152",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=718152"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2011-2517",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-2517"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-2517",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2011-2517"
}
],
"release_date": "2011-05-18T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Users should upgrade to these updated packages, which contain\nbackported patches to resolve these issues. The system must be\nrebooted for this update to take effect.\n\nBefore applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259\n\nTo install kernel packages manually, use \"rpm -ivh [package]\". Do not\nuse \"rpm -Uvh\" as that will remove the running kernel binaries from\nyour system. You may use \"rpm -e\" to remove old kernels after\ndetermining that the new kernel functions properly on your system.",
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{
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"integrityImpact": "COMPLETE",
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{
"category": "impact",
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}
],
"title": "kernel: nl80211: missing check for valid SSID size in scan operations"
},
{
"cve": "CVE-2011-2519",
"discovery_date": "2011-07-05T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "718882"
}
],
"notes": [
{
"category": "description",
"text": "Xen in the Linux kernel, when running a guest on a host without hardware assisted paging (HAP), allows guest users to cause a denial of service (invalid pointer dereference and hypervisor crash) via the SAHF instruction.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: xen: x86_emulate: fix SAHF emulation",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue only affects Red Hat Enterprise Linux 5. The versions of the Linux\nkernel-xen as shipped with Red Hat Enterprise Linux 4, 6, and Red Hat Enterprise MRG are not affected. This has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2011-1212.html.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2011-2519"
},
{
"category": "external",
"summary": "RHBZ#718882",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=718882"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2011-2519",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-2519"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-2519",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2011-2519"
}
],
"release_date": "2011-08-30T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Users should upgrade to these updated packages, which contain\nbackported patches to resolve these issues. The system must be\nrebooted for this update to take effect.\n\nBefore applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259\n\nTo install kernel packages manually, use \"rpm -ivh [package]\". Do not\nuse \"rpm -Uvh\" as that will remove the running kernel binaries from\nyour system. You may use \"rpm -e\" to remove old kernels after\ndetermining that the new kernel functions properly on your system.",
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"integrityImpact": "NONE",
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{
"category": "impact",
"details": "Moderate"
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"title": "kernel: xen: x86_emulate: fix SAHF emulation"
},
{
"cve": "CVE-2011-2901",
"cwe": {
"id": "CWE-193",
"name": "Off-by-one Error"
},
"discovery_date": "2011-08-04T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "728042"
}
],
"notes": [
{
"category": "description",
"text": "Off-by-one error in the __addr_ok macro in Xen 3.3 and earlier allows local 64 bit PV guest administrators to cause a denial of service (host crash) via unspecified hypercalls that ignore virtual-address bits.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: xen: off-by-one shift in x86_64 __addr_ok()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The versions of the Linux kernel as shipped with Red Hat Enterprise Linux 4, 6,\nand Red Hat Enterprise MRG are not affected. This has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2011-1212.html.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2011-2901"
},
{
"category": "external",
"summary": "RHBZ#728042",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=728042"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2011-2901",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-2901"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-2901",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2011-2901"
}
],
"release_date": "2011-08-30T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Users should upgrade to these updated packages, which contain\nbackported patches to resolve these issues. The system must be\nrebooted for this update to take effect.\n\nBefore applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259\n\nTo install kernel packages manually, use \"rpm -ivh [package]\". Do not\nuse \"rpm -Uvh\" as that will remove the running kernel binaries from\nyour system. You may use \"rpm -e\" to remove old kernels after\ndetermining that the new kernel functions properly on your system.",
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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2011:1813"
}
],
"scores": [
{
"cvss_v2": {
"accessComplexity": "LOW",
"accessVector": "ADJACENT_NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "COMPLETE",
"baseScore": 5.5,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:A/AC:L/Au:S/C:N/I:N/A:C",
"version": "2.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: xen: off-by-one shift in x86_64 __addr_ok()"
}
]
}
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