(RHSA-2019:2900) Important: kernel security and bug fix update

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• A buffer overflow flaw was found in the way Linux kernel’s vhost functionality that translates virtqueue buffers to IOVs, logged the buffer descriptors during migration. A privileged guest user able to pass descriptors with invalid length to the host when migration is underway, could use this flaw to increase their privileges on the host. (CVE-2019-14835)

• kernel: hw: Spectre SWAPGS gadget vulnerability (CVE-2019-1125)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• fs deadlock when a memory allocation waits on page writeback in NOFS context (BZ#1729105)

• fragmented packets timing out (BZ#1729410)

• kernel build: speed up debuginfo extraction (BZ#1731461)

• use “make -jN” for modules_install (BZ#1735080)

• shmem: consider shm_mnt as a long-term mount (BZ#1737375)

• Backport TCP follow-up for small buffers (BZ#1739126)