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Red Hat: RHSA-2021:1379-01 Important: Kernel-Alt DoS Issues

red hat
Calendar Grey April 27, 2021
Dist Redhat Esm H88
A vital security patch for kernel-alt improves Red Hat Enterprise Linux 7, addressing numerous severe vulnerabilities.
An update for kernel-alt 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-alt packages provide the Linux kernel version 4.x.
Security Fix(es):
* kernel: Use after free via PI futex state (CVE-2021-3347)
* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)
* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)
* kernel: powerpc: guest can cause DoS on POWER9 KVM hosts (CVE-2020-11669)
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):
* Kernel oops when resizing ext4 filesystem [rhel-alt-7.6.z] (BZ#1790900)
* [ipv6][ipsec]:unregister_netdevice: waiting for lo to become free. Usage count = 4 (BZ#1920805)

Topics%20covered

Topics Covered

security advisory bug fix DoS important kernel-alt

References

https://access.redhat.com/security/cve/CVE-2020-11669 https://access.redhat.com/security/cve/CVE-2021-3347 https://access.redhat.com/security/cve/CVE-2021-27364 https://access.redhat.com/security/cve/CVE-2021-27365 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):
Source: kernel-alt-4.14.0-115.36.1.el7a.src.rpm
aarch64: kernel-4.14.0-115.36.1.el7a.aarch64.rpm kernel-debug-4.14.0-115.36.1.el7a.aarch64.rpm kernel-debug-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm kernel-debug-devel-4.14.0-115.36.1.el7a.aarch64.rpm kernel-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm kernel-debuginfo-common-aarch64-4.14.0-115.36.1.el7a.aarch64.rpm kernel-devel-4.14.0-115.36.1.el7a.aarch64.rpm kernel-headers-4.14.0-115.36.1.el7a.aarch64.rpm kernel-tools-4.14.0-115.36.1.el7a.aarch64.rpm kernel-tools-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm kernel-tools-libs-4.14.0-115.36.1.el7a.aarch64.rpm perf-4.14.0-115.36.1.el7a.aarch64.rpm perf-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm python-perf-4.14.0-115.36.1.el7a.aarch64.rpm python-perf-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
noarch: kernel-abi-whitelists-4.14.0-115.36.1.el7a.noarch.rpm kernel-doc-4.14.0-115.36.1.el7a.noarch.rpm
ppc64le: kernel-4.14.0-115.36.1.el7a.ppc64le.rpm kernel-bootwrapper-4.14.0-115.36.1.el7a.ppc64le.rpm kernel-debug-4.14.0-115.36.1.el7a.ppc64le.rpm kernel-debug-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm kernel-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:1379-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:1379
Issue date: 2021-04-27

Topic

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

Topics%20covered

Topics Covered

security advisory bug fix DoS important kernel-alt

Relevant Releases Architectures

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, noarch, ppc64le, s390x

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le

Bugs Fixed

1824803 - CVE-2020-11669 kernel: powerpc: guest can cause DoS on POWER9 KVM hosts

1922249 - CVE-2021-3347 kernel: Use after free via PI futex state

1930078 - CVE-2021-27365 kernel: heap buffer overflow in the iSCSI subsystem

1930080 - CVE-2021-27364 kernel: out-of-bounds read in libiscsi module

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