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Red Hat 8: RHSA-2021-3447-01 Critical Memory Corruption Fix

red hat
Calendar Grey September 7, 2021
Dist Redhat Esm H88
Security patch for CentOS 8 deemed critical, fixing vulnerabilities linked to buffer overflow and user privilege escalation.
An update for kernel is now available for Red Hat Enterprise Linux 8

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: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)
* kernel: slab-out-of-bounds access in xdr_set_page_base() in net/sunrpc/xdr.c (CVE-2021-38201)
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):
* Update Broadcom Emulex lpfc driver for RHEL8.5 with bug fixes (BZ#1948608)
* cyclictest shows >50us latency when guest enters idle (RT guest with 18 RT vCPUs) (BZ#1981336)
* xfrm: backports from upstream (BZ#1981840)
* A task is stuck waiting for the completion of the vmci_resouce releasing upon the balloon reset. (BZ#1982042)
* [mlx5] backport driver bits of net: zero-initialize tc skb extension on allocation (BZ#1982220)
* Kernel cannot kill a process doing compaction for hugepage allocation (BZ#1984085)
* RHEL8.4 Nightly[0108] - [P10] [Regression] Kdump failed on RHEL8.4 on SAN disk via flavafish adapter (qla2xxx/HPT/Radix) (BZ#1986156)
* [RHEL8.5] scheduler updates and fixes (BZ#1987296)
* RHEL 8.3 using FCOE via a FastLinQ QL45000 card will not manually scan in LUN from Target_id's over 8 (BZ#1989097)
* fixes for oopses in security mitigation runtime code patching (BZ#1989174)
* act mirred doesn't scrub packets when sending them to ingress (BZ#1992226)
* HPE: Cannot install 8.4 using the DVD presented to the iLO (BZ#1993894)
* NFS client hangs on share listing when server side readdir verifiers are implemented (BZ#1993895)
* SNO: The load is extremely high (~870) when pao is added and a profile is applied. (BZ#1994879)
* timeout value of conntrack entry with TCP ESTABLISHED status is too short (BZ#1995554)
* Increase the default value for flowtable offload timeouts (BZ#1995555)
* ice/iavf driver stop responding (BZ#1997534)
* [FJ8.4 Bug]: [REG] Some files in /proc/sys/user show wrong data (BZ#1998002)

Topics%20covered

Topics Covered

security advisory Red Hat critical bug fix memory corruption kernel patch access issue

References

https://access.redhat.com/security/cve/CVE-2021-37576 https://access.redhat.com/security/cve/CVE-2021-38201 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: kernel-4.18.0-305.17.1.el8_4.src.rpm
aarch64: bpftool-4.18.0-305.17.1.el8_4.aarch64.rpm bpftool-debuginfo-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-core-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-cross-headers-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-debug-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-debug-core-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-debug-debuginfo-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-debug-devel-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-debug-modules-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-debug-modules-extra-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-debuginfo-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-debuginfo-common-aarch64-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-devel-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-headers-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-modules-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-modules-extra-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-tools-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-tools-debuginfo-4.18.0-305.17.1.el8_4.aarch64.rpm kernel-tools-libs-4.18.0-305.17.1.el8_4.aarch64.rpm perf-4.18.0-305.17.1.el8_4.aarch64.rpm perf-debuginfo-4.18.0-305.17.1.el8_4.aarch64.rpm python3-perf-4.18.0-305.17.1.el8_4.aarch64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3447-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3447
Issue date: 2021-09-07

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.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 Red Hat critical bug fix memory corruption kernel patch access issue

Relevant Releases Architectures

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, x86_64

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

Bugs Fixed

1986506 - CVE-2021-37576 kernel: powerpc: KVM guest OS users can cause host OS memory corruption

1992731 - CVE-2021-38201 kernel: slab-out-of-bounds access in xdr_set_page_base() in net/sunrpc/xdr.c

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