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The remote Red Hat host is missing one or more security updates.
Updated kernel packages that fix multiple security issues and various
bugs are now available for Red Hat Enterprise Linux 6.
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.
The kernel packages contain the Linux kernel, the core of any Linux
This update fixes the following security issues :
* IPv6 fragment identification value generation could allow a remote
attacker to disrupt a target system's networking, preventing
legitimate users from accessing its services. (CVE-2011-2699,
* A signedness issue was found in the Linux kernel's CIFS (Common
Internet File System) implementation. A malicious CIFS server could
send a specially crafted response to a directory read request that
would result in a denial of service or privilege escalation on a
system that has a CIFS share mounted. (CVE-2011-3191, Important)
* A flaw was found in the way the Linux kernel handled fragmented IPv6
UDP datagrams over the bridge with UDP Fragmentation Offload (UFO)
functionality on. A remote attacker could use this flaw to cause a
denial of service. (CVE-2011-4326, Important)
* The way IPv4 and IPv6 protocol sequence numbers and fragment IDs
were generated could allow a man-in-the-middle attacker to inject
packets and possibly hijack connections. Protocol sequence numbers and
fragment IDs are now more random. (CVE-2011-3188, Moderate)
* A buffer overflow flaw was found in the Linux kernel's FUSE
(Filesystem in Userspace) implementation. A local user in the fuse
group who has access to mount a FUSE file system could use this flaw
to cause a denial of service. (CVE-2011-3353, Moderate)
* A flaw was found in the b43 driver in the Linux kernel. If a system
had an active wireless interface that uses the b43 driver, an attacker
able to send a specially crafted frame to that interface could cause a
denial of service. (CVE-2011-3359, Moderate)
* A flaw was found in the way CIFS shares with DFS referrals at their
root were handled. An attacker on the local network who is able to
deploy a malicious CIFS server could create a CIFS network share that,
when mounted, would cause the client system to crash. (CVE-2011-3363,
* A flaw was found in the way the Linux kernel handled VLAN 0 frames
with the priority tag set. When using certain network drivers, an
attacker on the local network could use this flaw to cause a denial of
service. (CVE-2011-3593, Moderate)
* A flaw in the way memory containing security-related data was
handled in tpm_read() could allow a local, unprivileged user to read
the results of a previously run TPM command. (CVE-2011-1162, Low)
* A heap overflow flaw was found in the Linux kernel's EFI GUID
Partition Table (GPT) implementation. A local attacker could use this
flaw to cause a denial of service by mounting a disk that contains
specially crafted partition tables. (CVE-2011-1577, Low)
* The I/O statistics from the taskstats subsystem could be read
without any restrictions. A local, unprivileged user could use this
flaw to gather confidential information, such as the length of a
password used in a process. (CVE-2011-2494, Low)
* It was found that the perf tool, a part of the Linux kernel's
Performance Events implementation, could load its configuration file
from the current working directory. If a local user with access to the
perf tool were tricked into running perf in a directory that contains
a specially crafted configuration file, it could cause perf to
overwrite arbitrary files and directories accessible to that user.
Red Hat would like to thank Fernando Gont for reporting CVE-2011-2699
Darren Lavender for reporting CVE-2011-3191
Dan Kaminsky for
Yogesh Sharma for reporting CVE-2011-3363
Gideon Naim for reporting CVE-2011-3593
Peter Huewe for reporting
Timo Warns for reporting CVE-2011-1577
Kulikov of Openwall for reporting CVE-2011-2494.
This update also fixes various bugs. Documentation for these changes
will be available shortly from the Technical Notes document linked to
in the References section.
See also :
Update the affected packages.
Risk factor :
Critical / CVSS Base Score : 10.0
CVSS Temporal Score : 8.7
Public Exploit Available : true
Family: Red Hat Local Security Checks
Nessus Plugin ID: 56927 ()
Bugtraq ID: 47343488024914049289492954952749626496295031450751
CVE ID: CVE-2011-1162CVE-2011-1577CVE-2011-2494CVE-2011-2699CVE-2011-2905CVE-2011-3188CVE-2011-3191CVE-2011-3353CVE-2011-3359CVE-2011-3363CVE-2011-3593CVE-2011-4326
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