Important: kernel security and bug fix update

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.

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 in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c (CVE-2022-42896)
• kernel: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation (CVE-2023-1281)
• kernel: Use-after-free vulnerability in the Linux Kernel traffic control index filter (CVE-2023-1829)
• kernel: use-after-free vulnerability in the perf_group_detach function of the Linux Kernel Performance Events (CVE-2023-2235)
• kernel: OOB access in the Linux kernel's XFS subsystem (CVE-2023-2124)
• kernel: i2c: out-of-bounds write in xgene_slimpro_i2c_xfer() (CVE-2023-2194)

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):

• simultaneous writes to a page on xfs can result in zero-byte data (BZ#2184101)
• RHEL 8.4 - kernel: fix __clear_user() inline assembly constraints (BZ#2192602)
• LPAR is crashed by Phyp when doing DLPAR CPU operations (BZ#2193375)
• ice: ptp4l cpu usage spikes (BZ#2203285)
• Kernel - Significant performance drop for getrandom system call when FIPS is enabled (compared to RHEL 8.x for all x < 6.z) (BZ#2208127)
• macvlan: backports from upstream (BZ#2209686)
• Intel 8.9 BUG VROC: Pull VMD secondary bus reset patch (BZ#2211198)
• Incorrect target abort handling causes iscsi deadlock (BZ#2211494)
• swap deadlock when attempt to charge a page to a cgroup stalls waiting on I/O plugged on another task in swap code (BZ#2211513)
• BUG_ON "kernel BUG at mm/rmap.c:1041!" in __page_set_anon_rmap() when vma->anon_vma==NULL (BZ#2211658)
• RHEL 8.9: IPMI updates and bug fixes (BZ#2211667)
• RHEL 8.6 opening console with mkvterm on novalink terminal fails due to drmgr reporting failure (L3:) (BZ#2212373)
• RHEL 8.8 - P10 DD2.0: Wrong numa_node is assigned to vpmem device (BZ#2212451)
• RHEL 8.8 beta: Occasional stall during initialization of ipmi_msghandler (BZ#2213189)
• ESXi RHEL 8: Haswell generation CPU are impacted with performance due to IBRS (BZ#2213366)
• xen: fix section mismatch error with xen_callback_vector() and alloc_intr_gate() (BZ#2214281)
• jitter: Fix RCT/APT health test during initialization (BZ#2215079)
• aacraid misses interrupts when a CPU is disabled resulting in scsi timeouts and the adapter being unusable until reboot. (BZ#2216498)
• Hyper-V RHEL 8: Fix VM crash/hang Issues due to fast VF add/remove events (BZ#2216543)
• rbd: avoid fast-diff corruption in snapshot-based mirroring [8.9] (BZ#2216769)
• Regression of 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()") (BZ#2220810)

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.8 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.8 x86_64
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.8 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.8 x86_64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.8 aarch64

Fixes

• BZ - 2147364 - CVE-2022-42896 kernel: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c
• BZ - 2181847 - CVE-2023-1281 kernel: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation
• BZ - 2187439 - CVE-2023-2124 kernel: OOB access in the Linux kernel's XFS subsystem
• BZ - 2188396 - CVE-2023-2194 kernel: i2c: out-of-bounds write in xgene_slimpro_i2c_xfer()
• BZ - 2188470 - CVE-2023-1829 kernel: Use-after-free vulnerability in the Linux Kernel traffic control index filter
• BZ - 2192589 - CVE-2023-2235 kernel: use-after-free vulnerability in the perf_group_detach function of the Linux Kernel Performance Events

CVEs

• CVE-2022-42896
• CVE-2023-1281
• CVE-2023-1829
• CVE-2023-2124
• CVE-2023-2194
• CVE-2023-2235

References

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