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CentOS Linux 7 RHSA-2021:0440 Important Kernel Vulnerability Patch

red hat
Calendar Grey February 2, 2021
Dist Redhat Esm H88
Kernel enhancements for Red Hat Linux address vulnerabilities and rectify errors; advisory notes emphasize primary modifications and effects.
An update for kernel is now available for Red Hat Enterprise Linux 7

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: use-after-free in fs/block_dev.c (CVE-2020-15436)
* kernel: Nfsd failure to clear umask after processing an open or create (CVE-2020-35513)
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):
* double free issue in filelayout_alloc_commit_info (BZ#1679980)
* Regression: Plantronics Device SHS2355-11 PTT button does not work after update to 7.7 (BZ#1769502)
* Openstack network node reports unregister_netdevice: waiting for qr-3cec0c92-9a to become free. Usage count = 1 (BZ#1809519)
* dlm: add ability to interrupt waiting for acquire POSIX lock (BZ#1826858)
* [Azure][RHEL7] soft lockups and performance loss occurring during final fsync with parallel dd writes to xfs filesystem in azure instance (BZ#1859364)
* Guest crashed when hotplug vcpus on booting kernel stage (BZ#1866138)
* soft lockup occurs while a thread group leader is waiting on tasklist_waiters in mm_update_next_owner() where a huge number of the thread group members are exiting and trying to take the tasklist_lock. (BZ#1872110)
* [DELL EMC 7.6 BUG] Kioxia CM6 NVMe drive fails to enumerate (BZ#1883403)
* [Hyper-V][RHEL7] Request to included a commit that adds a timeout to vmbus_wait_for_unload (BZ#1888979)
* Unable to discover the LUNs from new storage port (BZ#1889311)
* RHEL 7.9 Kernel panic at ceph_put_snap_realm+0x21 (BZ#1890386)
* A hard lockup occurrs where one task is looping in an sk_lock spinlock that has been taken by another task running timespec64_add_ns(). (BZ#1890911)
* ethtool/mlx5_core provides incorrect SFP module info (BZ#1896756)
* RHEL7.7 - zcrypt: Fix ZCRYPT_PERDEV_REQCNT ioctl (BZ#1896826)
* RHEL7.7 - s390/dasd: Fix zero write for FBA devices (BZ#1896839)
* [Azure]IP forwarding issue in netvsc[7.9.z] (BZ#1898280)
* Security patch for CVE-2020-25212 breaks directory listings via 'ls' on NFS V4.2 shares mounted with selinux enabled labels (BZ#1917504)
Enhancement(s):
* RFE : handle better ERRbaduid on SMB1 (BZ#1847041)

Topics%20covered

Topics Covered

security advisory moderate Red Hat bug fix security fix kernel security Red Hat Enterprise Linux kernel fix kernel system update Moderate NFS issue use-after-free

References

https://access.redhat.com/security/cve/CVE-2020-15436 https://access.redhat.com/security/cve/CVE-2020-35513 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: kernel-3.10.0-1160.15.2.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm
x86_64: bpftool-3.10.0-1160.15.2.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm perf-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:0336-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0336
Issue date: 2021-02-02

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat bug fix security fix kernel security Red Hat Enterprise Linux kernel fix kernel system update Moderate NFS issue use-after-free

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Bugs Fixed

1901168 - CVE-2020-15436 kernel: use-after-free in fs/block_dev.c

1905208 - CVE-2020-35513 kernel: fix nfsd failure to clear umask after processing an open or create [rhel-7]

1911309 - CVE-2020-35513 kernel: Nfsd failure to clear umask after processing an open or create

1917504 - Security patch for CVE-2020-25212 breaks directory listings via 'ls' on NFS V4.2 shares mounted with selinux enabled labels

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