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====================================================================                   
Red Hat Security Advisory

Synopsis:          Low: kexec-tools security, bug fix, and enhancement update
Advisory ID:       RHSA-2021:4404-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4404
Issue date:        2021-11-09
CVE Names:         CVE-2021-20269
====================================================================
1. Summary:

An update for kexec-tools is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact
of Low. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

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

3. Description:

The kexec-tools packages contain the /sbin/kexec binary and utilities that
together form the user-space component of the kernel's kexec feature. The
/sbin/kexec binary facilitates a new kernel to boot using the kernel's
kexec feature either on a normal or a panic reboot. The kexec fastboot
mechanism allows booting a Linux kernel from the context of an already
running kernel.

Security Fix(es):

* kexec-tools: incorrect permissions on kdump dmesg file (CVE-2021-20269)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.5 Release Notes linked from the References section.

4. 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

5. Bugs fixed (https://bugzilla.redhat.com/):

1892558 - kdump: provide a library API to export suggested crashkernel reservation values
1915819 - perror_exit call inside check_user_configured_target() function is not providing absolute path of dump location upon kdump service failure.
1918499 - kdump initrd generation fails if /boot not writable
1934261 - CVE-2021-20269 kexec-tools: incorrect permissions on kdump dmesg file
1965267 - [RHEL-8.5][ppc64le] makedumpfile failed to copy /proc/kcore that 'get_mm_sparsemem: Can't get the address of mem_section' or output nothing

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
kexec-tools-2.0.20-57.el8.src.rpm

aarch64:
kexec-tools-2.0.20-57.el8.aarch64.rpm
kexec-tools-debuginfo-2.0.20-57.el8.aarch64.rpm
kexec-tools-debugsource-2.0.20-57.el8.aarch64.rpm

ppc64le:
kexec-tools-2.0.20-57.el8.ppc64le.rpm
kexec-tools-debuginfo-2.0.20-57.el8.ppc64le.rpm
kexec-tools-debugsource-2.0.20-57.el8.ppc64le.rpm

s390x:
kexec-tools-2.0.20-57.el8.s390x.rpm
kexec-tools-debuginfo-2.0.20-57.el8.s390x.rpm
kexec-tools-debugsource-2.0.20-57.el8.s390x.rpm

x86_64:
kexec-tools-2.0.20-57.el8.x86_64.rpm
kexec-tools-debuginfo-2.0.20-57.el8.x86_64.rpm
kexec-tools-debugsource-2.0.20-57.el8.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2021-20269
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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