Important: kernel security, bug fix, and enhancement 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: use-after-free caused by l2cap_reassemble_sdu() in net/bluetooth/l2cap_core.c (CVE-2022-3564)
• kernel: stack overflow in do_proc_dointvec and proc_skip_spaces (CVE-2022-4378)
• kernel: unmap_mapping_range() race with munmap() on VM_PFNMAP mappings leads to stale TLB entry (CVE-2022-39188)
• kernel: use-after-free related to leaf anon_vma double reuse (CVE-2022-42703)

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):

• An application stopped on robust futex used via pthread_mutex_lock() (BZ#2170055)
• dm crypt: backport flags to optionally bypass kcryptd workqueues (BZ#2175202)
• The qede driver changes rx-usecs: to 256 causing performance impact (BZ#2176106)
• Intel QAT Update - (kernel changes) (BZ#2176852)
• Concurrent NVMe scans cause panic with native multipath (BZ#2178244)
• CNB: Update TC subsystem to upstream v5.18 (BZ#2179432)
• Server crashed in cifs_reconnect -> dfs_cache_free_tgts (BZ#2182082)
• WARNING: possible circular locking dependency detected cpu_partial_store+0x44/0x80 (BZ#2184771)
• "smpboot: Scheduler frequency invariance went wobbly, disabling!" on nohz_full CPUs after long run (BZ#2188069)
• kernel-rt: task deadline_test:2526 blocked for more than 600 seconds. (BZ#2188625)
• gfs2: file corruption in large data files (BZ#2188687)

Enhancement(s):

• Add support for no HWP mode into intel_pstate for Sapphire Rapids (SPR) (BZ#2178644)

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 - 2130141 - CVE-2022-39188 kernel: unmap_mapping_range() race with munmap() on VM_PFNMAP mappings leads to stale TLB entry
• BZ - 2133483 - CVE-2022-42703 kernel: use-after-free related to leaf anon_vma double reuse
• BZ - 2150999 - CVE-2022-3564 kernel: use-after-free caused by l2cap_reassemble_sdu() in net/bluetooth/l2cap_core.c
• BZ - 2152548 - CVE-2022-4378 kernel: stack overflow in do_proc_dointvec and proc_skip_spaces

CVEs

• CVE-2022-3564
• CVE-2022-4378
• CVE-2022-39188
• CVE-2022-42703

References

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