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Red Hat: RHSA-2020:5473-01 Moderate: Kernel Information Exposure

red hat
Calendar Grey December 15, 2020
Dist Redhat Esm H88
Canonical releases a new kernel for Ubuntu 22.04, improving security measures and fixing several critical bugs.
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: information exposure in drivers/char/random.c and kernel/time/timer.c (CVE-2020-16166)
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):
* Backport upstream OVS performance patch fix (BZ#1879935)
* Sleeping or scheduling after sched_cpu_dying() led to "scheduling while atomic" and BUG at kernel/cpu.c:907! (BZ#1880080)
* [conntrack] udp packet reverse NAT occasionally fail when race condition request combination with the DNAT load balancing rules (BZ#1882094)
* Unexpected fragmentation needed error, OpenShift 4, OVS, VXLAN, GSO, Azure (BZ#1885766)
* Unable to attach VLAN-based logical networks to a bond (BZ#1886017)
* NFS server with krb5p fails in FIPS mode: context_derive_keys_new: Error 22 deriving initiator_seal key (BZ#1886189)
* XFS: reflinked file data corruption (BZ#1886895)
* [HPE 8.3 Bug] Kdump bootup failure caused by an amd iommu commit for Rhel8.3 BetaOS on DL325Gen10 (BZ#1888113)
* dm: fix bio splitting and its bio completion order for regular IO (BZ#1890233)
* geneve: add transport ports in route lookup for geneve (BZ#1891818)
* HRTICK not armed in specific cases with SCHED_DEADLINE (BZ#1894073)
* PM/swap Speed up hibernation by batching requests (BZ#1894629)
* RHEL8.1 - ibmveth is producing TX errors over VXLAN when large send (TSO) is enabled (-> related to Red Hat bug 1816254 - OCP 4.3 - Authentication clusteroperator is in unknown state on POWER 9 servers") (BZ#1896299)
* RHEL8.2 - mm/gup: fix gup_fast with dynamic page table folding (BZ#1896351)
* [Azure][RHEL-8]TX/RX packets stop increasing after hibernation/resume in VM with CX4 VF NIC (BZ#1896433)
* [Azure][RHEL-8]VM hangs after hibernation/resume if the VM has SRIOV NIC and has been deallocated (BZ#1896434)
* [Azure] hv_irq_unmask() failed: 0x5 after resume from hibernation in NV6 size (BZ#1896435)
* block layer: update to upstream v5.8 (BZ#1896787)
* [Regression] RHEL8.2 zstream - Undetected Data corruption in MPI workloads that use VSX for reductions on POWER9 DD2.1 systems (BZ#1897278)
* Incorrect system time reported through the CPU Accounting statistics (BZ#1897716)
* debug kernel reports BUG: sleeping function called from invalid context at mm/slab.h:496 in aws t4g instances (BZ#1898758)
* ARO: excessive pod memory allocation causes node lockup (BZ#1901547)

References

https://access.redhat.com/security/cve/CVE-2020-16166 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: kernel-4.18.0-240.8.1.el8_3.src.rpm
aarch64: bpftool-4.18.0-240.8.1.el8_3.aarch64.rpm bpftool-debuginfo-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-core-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-cross-headers-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-debug-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-debug-core-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-debug-debuginfo-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-debug-devel-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-debug-modules-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-debug-modules-extra-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-debuginfo-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-debuginfo-common-aarch64-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-devel-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-headers-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-modules-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-modules-extra-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-tools-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-tools-debuginfo-4.18.0-240.8.1.el8_3.aarch64.rpm kernel-tools-libs-4.18.0-240.8.1.el8_3.aarch64.rpm perf-4.18.0-240.8.1.el8_3.aarch64.rpm perf-debuginfo-4.18.0-240.8.1.el8_3.aarch64.rpm python3-perf-4.18.0-240.8.1.el8_3.aarch64.rpm

Read the Full Advisory


Advisory ID: RHSA-2020:5473-01
Product: Red Hat Enterprise Linux
Issue date: 2020-12-15

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 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.

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

1865751 - CVE-2020-16166 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c

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