RHSA-2021:0354 - Security Advisory

Topic

An update for kernel-alt 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-alt packages provide the Linux kernel version 4.x.

Security Fix(es):

• kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free (CVE-2020-29661)
• kernel: some ipv6 protocols not encrypted over ipsec tunnel (CVE-2020-1749)
• kernel: use-after-free in fs/block_dev.c (CVE-2020-15436)

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.

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 Power 9 7 ppc64le
• Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x

Fixes

• BZ - 1809833 - CVE-2020-1749 kernel: some ipv6 protocols not encrypted over ipsec tunnel
• BZ - 1901168 - CVE-2020-15436 kernel: use-after-free in fs/block_dev.c
• BZ - 1906525 - CVE-2020-29661 kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free

CVEs

• CVE-2020-1749
• CVE-2020-15436
• CVE-2020-29661

References

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