Description: | The kernel packages contain the Linux kernel, the core of any Linuxoperating system.A use-after-free flaw was found in the way the Linux kernel's SCTPimplementation handled authentication key reference counting during INITcollisions. A remote attacker could use this flaw to crash the system or,potentially, escalate their privileges on the system. (CVE-2015-1421,Important)This issue was discovered by Sun Baoliang of Red Hat.This update also fixes the following bugs:When ARP is disabled on an interface with an ARP entry for a neighborhost present in the ARP cache, letting the cached entry expire andattempting to communicate with that neighbor host could cause the host MACaddress to not be resolved correctly after ARP is enabled again on theinterface. With the following workaround, the entry is not expired and thedescribed scenario works correctly:1) Add the maximum number of ARP entries you expect for your configurationto the proc/sys/net/ipv4/neigh/default/gc_thresh file.2) Ensure that relevant IP addresses are put in the ARP cache when thesystem boots, for example by executing the following two commands:ping [IP address] -c 1ifconfig ethX -arp(BZ#1207350)Previously, the open() system call in some cases failed with an EBUSYerror if the opened file was also being renamed at the same time. With thisupdate, the kernel automatically retries open() when this failure occurs,and if the retry is not successful either, open() now fails with an ESTALEerror. (BZ#1207813)Previously, a race condition occurred in the build_id_cache__add_s()function, which could truncate system files. A patch has been provided tofix this bug, and system files are no longer truncated in theaforementioned scenario. (BZ#1210591)All kernel users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues. The system must berebooted for this update to take effect. |