RHSA-2016:1847-01 -- Redhat kernel, python-perf, perfID: oval:org.secpod.oval:def:501870 | Date: (C)2016-09-16 (M)2023-12-07 |
Class: PATCH | Family: unix |
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: * A security flaw was found in the Linux kernel in the mark_source_chains function in net/ipv4/netfilter/ip_tables.c. It is possible for a user-supplied ipt_entry structure to have a large next_offset field. This field is not bounds checked prior to writing to a counter value at the supplied offset. * A flaw was discovered in processing setsockopt for 32 bit processes on 64 bit systems. This flaw will allow attackers to alter arbitrary kernel memory when unloading a kernel module. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges. * An out-of-bounds heap memory access leading to a Denial of Service, heap disclosure, or further impact was found in setsockopt. The function call is normally restricted to root, however some processes with cap_sys_admin may also be able to trigger this flaw in privileged container environments. Bug Fix: * In some cases, running the ipmitool command caused a kernel panic due to a race condition in the ipmi message handler. This update fixes the race condition, and the kernel panic no longer occurs in the described scenario. * Previously, running I/O-intensive operations in some cases caused the system to terminate unexpectedly after a null pointer dereference in the kernel. With this update, a set of patches has been applied to the 3w-9xxx and 3w-sas drivers that fix this bug. As a result, the system no longer crashes in the described scenario. * Previously, the Stream Control Transmission Protocol sockets did not inherit the SELinux labels properly. As a consequence, the sockets were labeled with the unlabeled_t SELinux type which caused SCTP connections to fail. The underlying source code has been modified, and SCTP connections now works as expected. * Previously, the bnx2x driver waited for transmission completions when recovering from a parity event, which substantially increased the recovery time. With this update, bnx2x does not wait for transmission completion in the described circumstances. As a result, the recovery of bnx2x after a parity event now takes less time. Enhancement: * With this update, the audit subsystem enables filtering of processes by name besides filtering by PID. Users can now audit by executable name , which allows expression of many new audit rules. This functionality can be used to create events when specific applications perform a syscall. * With this update, the Nonvolatile Memory Express and the multi-queue block layer have been upgraded to the Linux 4.5 upstream version. Previously, a race condition between timeout and freeing request in blk_mq occurred, which could affect the blk_mq_tag_to_rq function and consequently a kernel oops could occur. The provided patch fixes this race condition by updating the tags with the active request. The patch simplifies blk_mq_tag_to_rq and ensures that the two requests are not active at the same time. * The Hyper-V storage driver has been upgraded from upstream. This update provides moderate performance improvement of I/O operations when using storvscr for certain workloads. Additional Changes: Space precludes documenting all of the bug fixes and enhancements included in this advisory. To see the complete list of bug fixes and enhancements, refer to the following KnowledgeBase article: https://access.redhat.com/articles/2592321
Platform: |
Red Hat Enterprise Linux 7 |
Product: |
kernel |
python-perf |
perf |