RHSA-2021:1071 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. 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.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)
• kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)
• kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)

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):

• Customer testing eMMC sees and intermittent boot problem on 7.8+, was not seen on 7.3 (BZ#1918916)
• tcm loopback driver causes double-start of scsi command when work is delayed (BZ#1925652)
• [Azure][RHEL-7]Mellanox Patches To Prevent Kernel Hang In MLX4 (BZ#1925691)
• A patch from upstream c365c292d059 causes us to end up leaving rt_nr_boosted in an inconsistent state, which causes a hard lockup. (BZ#1928082)
• [RHEL7.9.z] Add fix to update snd_wl1 in bulk receiver fast path (BZ#1929804)

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.

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Virtualization Host 4 for RHEL 7 x86_64

Fixes

• BZ - 1930078 - CVE-2021-27365 kernel: heap buffer overflow in the iSCSI subsystem
• BZ - 1930079 - CVE-2021-27363 kernel: iscsi: unrestricted access to sessions and handles
• BZ - 1930080 - CVE-2021-27364 kernel: out-of-bounds read in libiscsi module

CVEs

• CVE-2021-27363
• CVE-2021-27364
• CVE-2021-27365

References

• https://access.redhat.com/security/updates/classification/#important