RHSA-2021:3327: Important: kernel security and bug fix update
The kernel packages contain the Linux kernel, the core of any Linux operating system.<br>Security Fix(es):<br><li> kernel: out-of-bounds write in xtcompattargetfromuser() in net/netfilter/xtables.c (CVE-2021-22555)</li> <li> kernel: race condition for removal of the HCI controller (CVE-2021-32399)</li> <li> kernel: powerpc: RTAS calls can be used to compromise kernel integrity (CVE-2020-27777)</li> <li> kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)</li> <li> kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/xtables.c and include/linux/netfilter/xtables.h may lead to DoS (CVE-2021-29650)</li> 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.<br>Bug Fix(es):<br><li> SAN Switch rebooted and caused (?) OpenStack compute node to reboot (BZ#1897576)</li> <li> sysfs: cannot create duplicate filename '/class/mdiobus/ixgbe-8100 (BZ#1915449)</li> <li> XFS: read-only recovery does not update free space accounting in superblock (BZ#1921551)</li> <li> The memcgparams field of kmemcache struct contains an old slab address that is to small for the current size of memcglimitedgroupsarraysize. (BZ#1951810)</li> <li> Backport of upstream patch "net: Update windowclamp if SOCKRCVBUF is set " into rhel-7 (BZ#1962196)</li> <li> Kernel panic in initcqfragbuf (BZ#1962499)</li> <li> futex: futexrequeue can potentially free the pistate structure twice (BZ#1966856)</li> <li> bepoll lockup doing ifenslave when netconsole using bond (BZ#1971744)</li> <li> OCP4.7 nodes panic at BUGON in nfnatsetupinfo() (BZ#1972970)</li>
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of RHSA-2021:3327?
The severity of RHSA-2021:3327 is classified as important due to potential risks from an out-of-bounds write and race conditions.
How do I fix RHSA-2021:3327?
To fix RHSA-2021:3327, you should update your kernel packages to version 3.10.0-1160.41.1.el7 or later.
Which systems are affected by RHSA-2021:3327?
Systems running Red Hat Enterprise Linux 7 with kernel versions prior to 3.10.0-1160.41.1.el7 are affected by RHSA-2021:3327.
What vulnerabilities are addressed in RHSA-2021:3327?
RHSA-2021:3327 addresses vulnerabilities including an out-of-bounds write in xt_compat_target_from_user() and a race condition for HCI control removal.
What should I do if my system cannot be updated for RHSA-2021:3327?
If your system cannot be updated for RHSA-2021:3327, consider implementing additional security measures such as access controls or isolation until an update can be applied.