Synopsis

Important: kernel-alt security and bug fix update

Type/Severity

Security Advisory: Important

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: nfs: use-after-free in svc_process_common() (CVE-2018-16884)
• Kernel: ppc: kvm: conflicting use of HSTATE_HOST_R1 to store r1 state leads to host stack corruption (CVE-2020-8834)
• Kernel: vfio: access to disabled MMIO space of some devices may lead to DoS scenario (CVE-2020-12888)
• kernel: use after free due to race condition in the video driver leads to local privilege escalation (CVE-2019-9458)
• kernel: use-after-free in drivers/char/ipmi/ipmi_si_intf.c, ipmi_si_mem_io.c, ipmi_si_port_io.c (CVE-2019-11811)
• kernel: use-after-free in drivers/bluetooth/hci_ldisc.c (CVE-2019-15917)
• kernel: memory leak in ccp_run_sha_cmd() function in drivers/crypto/ccp/ccp-ops.c (CVE-2019-18808)
• kernel: use-after-free in __ext4_expand_extra_isize and ext4_xattr_set_entry related to fs/ext4/inode.c and fs/ext4/super.c (CVE-2019-19767)
• kernel: an out-of-bounds write via crafted keycode table (CVE-2019-20636)
• kernel: use-after-free read in napi_gro_frags() in the Linux kernel (CVE-2020-10720)
• kernel: out-of-bounds write in mpol_parse_str function in mm/mempolicy.c (CVE-2020-11565)
• kernel: A memory leak in the crypto_report() function in crypto/crypto_user_base.c allows for a DoS (CVE-2019-19062)

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):

• XFS: Metadata corruption detected at xfs_attr3_leaf_read_verify [rhel-alt-7.6.z] (BZ#1830836)

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 ARM 64 7 aarch64
• Red Hat Enterprise Linux for Power 9 7 ppc64le
• Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x

Fixes

• BZ - 1660375 - CVE-2018-16884 kernel: nfs: use-after-free in svc_process_common()
• BZ - 1709180 - CVE-2019-11811 kernel: use-after-free in drivers/char/ipmi/ipmi_si_intf.c, ipmi_si_mem_io.c, ipmi_si_port_io.c
• BZ - 1760100 - CVE-2019-15917 kernel: use-after-free in drivers/bluetooth/hci_ldisc.c
• BZ - 1775021 - CVE-2019-19062 kernel: A memory leak in the crypto_report() function in crypto/crypto_user_base.c allows for a DoS
• BZ - 1777418 - CVE-2019-18808 kernel: memory leak in ccp_run_sha_cmd() function in drivers/crypto/ccp/ccp-ops.c
• BZ - 1781204 - CVE-2020-10720 kernel: use-after-free read in napi_gro_frags() in the Linux kernel
• BZ - 1786160 - CVE-2019-19767 kernel: use-after-free in __ext4_expand_extra_isize and ext4_xattr_set_entry related to fs/ext4/inode.c and fs/ext4/super.c
• BZ - 1819377 - CVE-2019-9458 kernel: use after free due to race condition in the video driver leads to local privilege escalation
• BZ - 1819615 - CVE-2020-8834 Kernel: ppc: kvm: conflicting use of HSTATE_HOST_R1 to store r1 state leads to host stack corruption
• BZ - 1824059 - CVE-2019-20636 kernel: an out-of-bounds write via crafted keycode table
• BZ - 1824918 - CVE-2020-11565 kernel: out-of-bounds write in mpol_parse_str function in mm/mempolicy.c
• BZ - 1836244 - CVE-2020-12888 Kernel: vfio: access to disabled MMIO space of some devices may lead to DoS scenario

CVEs

• CVE-2018-16884
• CVE-2019-9458
• CVE-2019-11811
• CVE-2019-15917
• CVE-2019-18808
• CVE-2019-19062
• CVE-2019-19767
• CVE-2019-20636
• CVE-2020-8834
• CVE-2020-10720
• CVE-2020-11565
• CVE-2020-12888

References