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: Integer overflow in Intel(R) Graphics Drivers (CVE-2020-12362)
• kernel: Use after free via PI futex state (CVE-2021-3347)
• kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c (CVE-2020-8648)
• kernel: Improper input validation in some Intel(R) Graphics Drivers (CVE-2020-12363)
• kernel: Null pointer dereference in some Intel(R) Graphics Drivers (CVE-2020-12364)
• kernel: Speculation on pointer arithmetic against bpf_context pointer (CVE-2020-27170)

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):

• kernel crash when call the timer function (sctp_generate_proto_unreach_event) of sctp module (BZ#1707184)
• SCSI error handling process on HP P440ar controller gets stuck indefinitely in device reset operation (BZ#1830268)
• netfilter: reproducible deadlock on nft_log module autoload (BZ#1858329)
• netfilter: NULL pointer dereference in nf_tables_set_lookup() (BZ#1873171)
• [DELL EMC 7.9 Bug]: No acpi_pad threads on top command for "power cap policy equal to 0 watts" (BZ#1883174)
• A race between i40e_ndo_set_vf_mac() and i40e_vsi_clear() in the i40e driver causes a use after free condition of the kmalloc-4096 slab cache. (BZ#1886003)
• netxen driver performs poorly with RT kernel (BZ#1894274)
• gendisk->disk_part_tbl->last_lookup retains pointer after partition deletion (BZ#1898596)
• Kernel experiences panic in update_group_power() due to division error even with Bug 1701115 fix (BZ#1910763)
• RHEL7.9 - zfcp: fix handling of FCP_RESID_OVER bit in fcp ingress path (BZ#1917839)
• RHEL7.9 - mm/THP: do not access vma->vm_mm after calling handle_userfault (BZ#1917840)
• raid: wrong raid io account (BZ#1927106)
• qla2x00_status_cont_entry() missing upstream patch that prevents unnecessary ABRT/warnings (BZ#1933784)
• RHEL 7.9.z - System hang caused by workqueue stall in qla2xxx driver (BZ#1937945)
• selinux: setsebool can trigger a deadlock (BZ#1939091)
• [Hyper-V][RHEL-7] Cannot boot kernel 3.10.0-1160.21.1.el7.x86_64 on Hyper-V (BZ#1941841)

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 - 1802559 - CVE-2020-8648 kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c
• BZ - 1922249 - CVE-2021-3347 kernel: Use after free via PI futex state
• BZ - 1930246 - CVE-2020-12362 kernel: Integer overflow in Intel(R) Graphics Drivers
• BZ - 1930249 - CVE-2020-12363 kernel: Improper input validation in some Intel(R) Graphics Drivers
• BZ - 1930251 - CVE-2020-12364 kernel: Null pointer dereference in some Intel(R) Graphics Drivers
• BZ - 1940627 - CVE-2020-27170 kernel: Speculation on pointer arithmetic against bpf_context pointer
• BZ - 1941841 - [Hyper-V][RHEL-7] Cannot boot kernel 3.10.0-1160.21.1.el7.x86_64 on Hyper-V

CVEs

• CVE-2020-8648
• CVE-2020-12362
• CVE-2020-12363
• CVE-2020-12364
• CVE-2020-27170
• CVE-2021-3347

References

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