rhsa-2011_1163
Vulnerability from csaf_redhat
Published
2011-08-16 18:27
Modified
2024-11-05 17:34
Summary
Red Hat Security Advisory: kernel security and bug fix update
Notes
Topic
Updated kernel packages that fix two security issues and three 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
The kernel packages contain the Linux kernel, the core of any Linux
operating system.
This update includes backported fixes for two security issues. These issues
only affected users of Red Hat Enterprise Linux 5.6 Extended Update
Support, as they have already been addressed for users of Red Hat
Enterprise Linux 5 in the 5.7 update, RHSA-2011:1065.
This update fixes the following security issues:
* A flaw was found in the way the Xen hypervisor implementation handled
instruction emulation during virtual machine exits. A malicious user-space
process running in an SMP guest could trick the emulator into reading a
different instruction than the one that caused the virtual machine to exit.
An unprivileged guest user could trigger this flaw to crash the host. This
only affects systems with both an AMD x86 processor and the AMD
Virtualization (AMD-V) extensions enabled. (CVE-2011-1780, Important)
* A flaw allowed the tc_fill_qdisc() function in the Linux kernel's packet
scheduler API implementation to be called on built-in qdisc structures. A
local, unprivileged user could use this flaw to trigger a NULL pointer
dereference, resulting in a denial of service. (CVE-2011-2525, Moderate)
This update also fixes the following bugs:
* A bug was found in the way the x86_emulate() function handled the IMUL
instruction in the Xen hypervisor. On systems without support for 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), this bug
could cause fully-virtualized guests to crash or lead to silent memory
corruption. In reported cases, this issue occurred when booting
fully-virtualized Red Hat Enterprise Linux 6.1 guests with memory cgroups
enabled. (BZ#712884)
* A bug in the way the ibmvscsi driver handled interrupts may have
prevented automatic path recovery for multipath devices. This bug only
affected 64-bit PowerPC systems. (BZ#720929)
* The RHSA-2009:1243 update introduced a regression in the way file locking
on NFS (Network File System) was handled. This caused applications to hang
if they made a lock request on a file on an NFS version 2 or 3 file system
that was mounted with the "sec=krb5" option. With this update, the original
behavior of using mixed RPC authentication flavors for NFS and locking
requests has been restored. (BZ#722854)
Users should upgrade to these updated packages, which contain backported
patches to resolve these issues. 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 packages contain the Linux kernel, the core of any Linux\noperating system.\n\nThis update includes backported fixes for two security issues. These issues\nonly affected users of Red Hat Enterprise Linux 5.6 Extended Update\nSupport, as they have already been addressed for users of Red Hat\nEnterprise Linux 5 in the 5.7 update, RHSA-2011:1065.\n\nThis update fixes the following security issues:\n\n* A flaw was found in the way the Xen hypervisor implementation handled\ninstruction emulation during virtual machine exits. A malicious user-space\nprocess running in an SMP guest could trick the emulator into reading a\ndifferent instruction than the one that caused the virtual machine to exit.\nAn unprivileged guest user could trigger this flaw to crash the host. This\nonly affects systems with both an AMD x86 processor and the AMD\nVirtualization (AMD-V) extensions enabled. (CVE-2011-1780, Important)\n\n* A flaw allowed the tc_fill_qdisc() function in the Linux kernel\u0027s packet\nscheduler API implementation to be called on built-in qdisc structures. A\nlocal, unprivileged user could use this flaw to trigger a NULL pointer\ndereference, resulting in a denial of service. (CVE-2011-2525, Moderate)\n\nThis update also fixes the following bugs:\n\n* A bug was found in the way the x86_emulate() function handled the IMUL\ninstruction in the Xen hypervisor. On systems without support for hardware\nassisted paging (HAP), such as those running CPUs that do not have support\nfor (or those that have it disabled) Intel Extended Page Tables (EPT) or\nAMD Virtualization (AMD-V) Rapid Virtualization Indexing (RVI), this bug\ncould cause fully-virtualized guests to crash or lead to silent memory\ncorruption. In reported cases, this issue occurred when booting\nfully-virtualized Red Hat Enterprise Linux 6.1 guests with memory cgroups\nenabled. (BZ#712884)\n\n* A bug in the way the ibmvscsi driver handled interrupts may have\nprevented automatic path recovery for multipath devices. This bug only\naffected 64-bit PowerPC systems. (BZ#720929)\n\n* The RHSA-2009:1243 update introduced a regression in the way file locking\non NFS (Network File System) was handled. This caused applications to hang\nif they made a lock request on a file on an NFS version 2 or 3 file system\nthat was mounted with the \"sec=krb5\" option. With this update, the original\nbehavior of using mixed RPC authentication flavors for NFS and locking\nrequests has been restored. (BZ#722854)\n\nUsers should upgrade to these updated packages, which contain backported\npatches to resolve these issues. The system must be rebooted for this\nupdate to take effect.",
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{
"cve": "CVE-2011-2525",
"discovery_date": "2011-07-12T00:00:00+00:00",
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"text": "720552"
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{
"category": "description",
"text": "The qdisc_notify function in net/sched/sch_api.c in the Linux kernel before 2.6.35 does not prevent tc_fill_qdisc function calls referencing builtin (aka CQ_F_BUILTIN) Qdisc structures, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) or possibly have unspecified other impact via a crafted call.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: kernel: net_sched: fix qdisc_notify()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw affects Red Hat Enterprise Linux 4 and 5. It did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as they have already backported the upstream commit 53b0f080 that addressed this flaw. This has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2011-1065.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"
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"date": "2011-08-16T18:27:00+00:00",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: kernel: net_sched: fix qdisc_notify()"
}
]
}
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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.