Important: kernel security and bug fix update

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.6 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: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation (CVE-2023-1281)
• kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation (CVE-2023-32233)

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):

• RHEL8.4 - s390/smp,vdso: fix ASCE handling (BZ#2176464)
• After powerstore LUNs are mapped, OS crashed and host reboot. (BZ#2179068)
• qla2xxx NVMe-FC: WARNING: CPU: 0 PID: 124072 at drivers/scsi/qla2xxx/qla_init.c:70 qla2xxx_rel_done_warning+0x25/0x30 [qla2xxx] (BZ#2181529)
• iscsi target deadlocks when the same host acts as an initiator to itself (i.e. connects via 127.0.0.1) (BZ#2182095)
• Dying percpu kworkers cause issues on isolated CPUs [rhel-8] (BZ#2189597)
• Azure RHEL8: Live resize of disk does not trigger a rescan of the device capacity (BZ#2192345)
• RHEL8.4 - kernel: fix __clear_user() inline assembly constraints (BZ#2192604)
• RHEL8.6, lockd : oops on nlmsvc_mark_host (BZ#2196386)
• xfs: deadlock in xfs_btree_split_worker (BZ#2196392)
• Intel E810 card unable to create a MACVLAN on interface already configured as SRIOV (BZ#2203217)
• ice: ptp4l cpu usage spikes (BZ#2203287)
• Kernel - Significant performance drop for getrandom system call when FIPS is enabled (compared to RHEL 8.x for all x < 6.z) (BZ#2208130)
• Azure RHEL8: CVM patch list requirement-storvsc patch (BZ#2208601)
• BUG_ON "kernel BUG at mm/rmap.c:1041!" in __page_set_anon_rmap() when vma->anon_vma==NULL (BZ#2211661)
• RHEL 8.6 opening console with mkvterm on novalink terminal fails due to drmgr reporting failure (L3:) (BZ#2212374)
• ESXi RHEL8: Haswell generation CPU are impacted with performance due to IBRS (BZ#2213367)
• Hyper-V RHEL-8: Fix VM crash/hang Issues due to fast VF add/remove events (BZ#2216544)

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 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.6 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat Virtualization Host 4 for RHEL 8 x86_64
• Red Hat Enterprise Linux Server - TUS 8.6 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.6 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.6 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.6 x86_64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.6 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.6 aarch64

Fixes

• BZ - 2181847 - CVE-2023-1281 kernel: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation
• BZ - 2196105 - CVE-2023-32233 kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation

CVEs

• CVE-2023-1281
• CVE-2023-32233

References

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