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Red Hat: RHSA-2021:2728-01 Important Kernel Update: Buffer Overflow Threat

red hat
Calendar Grey July 20, 2021
Dist Redhat Esm H88
The recent critical kernel security patch issued by Red Hat (RHSA-2021-2728-01) tackles major vulnerabilities found in RHEL 7.7.
An update for kernel is now available for Red Hat Enterprise Linux 7.7 Extended Update Support

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: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
* kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
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.

Topics%20covered

Topics Covered

security advisory Red Hat update buffer overflow important kernel filesystem

References

https://access.redhat.com/security/cve/CVE-2021-33034 https://access.redhat.com/security/cve/CVE-2021-33909 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/security/vulnerabilities/RHSB-2021-006

Package List

Red Hat Enterprise Linux ComputeNode EUS (v. 7.7):
Source: kernel-3.10.0-1062.52.2.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-1062.52.2.el7.noarch.rpm kernel-doc-3.10.0-1062.52.2.el7.noarch.rpm
x86_64: bpftool-3.10.0-1062.52.2.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm kernel-3.10.0-1062.52.2.el7.x86_64.rpm kernel-debug-3.10.0-1062.52.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-1062.52.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1062.52.2.el7.x86_64.rpm kernel-devel-3.10.0-1062.52.2.el7.x86_64.rpm kernel-headers-3.10.0-1062.52.2.el7.x86_64.rpm kernel-tools-3.10.0-1062.52.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-1062.52.2.el7.x86_64.rpm perf-3.10.0-1062.52.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm python-perf-3.10.0-1062.52.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7):
x86_64: bpftool-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1062.52.2.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2728-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2728
Issue date: 2021-07-20

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.7Extended Update Support.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 update buffer overflow important kernel filesystem

Relevant Releases Architectures

Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) - x86_64

Red Hat Enterprise Linux Server EUS (v. 7.7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.7) - ppc64, ppc64le, x86_64

Bugs Fixed

1961305 - CVE-2021-33034 kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan

1970273 - CVE-2021-33909 kernel: size_t-to-int conversion vulnerability in the filesystem layer

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