RHSA-2021:0878 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.6 Extended Update Support.

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: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free (CVE-2020-29661)
• kernel: performance counters race condition use-after-free (CVE-2020-14351)
• kernel: umask not applied on filesystem without ACL support (CVE-2020-24394)
• kernel: TOCTOU mismatch in the NFS client code (CVE-2020-25212)

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):

• Security patch for CVE-2020-25212 breaks directory listings via 'ls' on NFS V4.2 shares mounted with selinux enabled labels (BZ#1919144)
• Enable CI and changelog for GitLab workflow (BZ#1930931)

Enhancement(s):

• [Cavium 7.7 Feat] qla2xxx: Update to latest upstream. (BZ#1918534)

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 for x86_64 - Extended Update Support 7.6 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
• Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.6 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL 7.6 x86_64

Fixes

• BZ - 1862849 - CVE-2020-14351 kernel: performance counters race condition use-after-free
• BZ - 1869141 - CVE-2020-24394 kernel: umask not applied on filesystem without ACL support
• BZ - 1877575 - CVE-2020-25212 kernel: TOCTOU mismatch in the NFS client code
• BZ - 1906525 - CVE-2020-29661 kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free

CVEs

• CVE-2020-14351
• CVE-2020-24394
• CVE-2020-25212
• CVE-2020-29661

References

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