RHSA-2011:1465: Important: kernel security and bug fix update

The kernel packages contain the Linux kernel, the core of any Linuxoperating system.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 legitimateusers from accessing its services. (CVE-2011-2699, Important) A signedness issue was found in the Linux kernel's CIFS (Common Internet File System) implementation. A malicious CIFS server could send aspecially-crafted response to a directory read request that would result ina denial of service or privilege escalation on a system that has a CIFSshare 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 denialof 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 andpossibly hijack connections. Protocol sequence numbers and fragment IDs arenow 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 accessto mount a FUSE file system could use this flaw to cause a denial ofservice. (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 tosend a specially-crafted frame to that interface could cause a denial ofservice. (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 amalicious CIFS server could create a CIFS network share that, when mounted,would cause the client system to crash. (CVE-2011-3363, Moderate) 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 onthe 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 tpmread() could allow a local, unprivileged user to read the results of apreviously 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 causea denial of service by mounting a disk that contains specially-craftedpartition 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 gatherconfidential information, such as the length of a password used in aprocess. (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 currentworking directory. If a local user with access to the perf tool weretricked into running perf in a directory that contains a specially-craftedconfiguration file, it could cause perf to overwrite arbitrary files anddirectories accessible to that user. (CVE-2011-2905, Low)Red Hat would like to thank Fernando Gont for reporting CVE-2011-2699;Darren Lavender for reporting CVE-2011-3191; Dan Kaminsky for reportingCVE-2011-3188; Yogesh Sharma for reporting CVE-2011-3363; Gideon Naim forreporting CVE-2011-3593; Peter Huewe for reporting CVE-2011-1162; TimoWarns for reporting CVE-2011-1577; and Vasiliy Kulikov of Openwall forreporting CVE-2011-2494.This update also fixes various bugs. Documentation for these changes willbe available shortly from the Technical Notes document linked to in theReferences section.