(RHSA-2023:2148) Important: kernel-rt security and bug fix update

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c (CVE-2022-42896)

• net/ulp: use-after-free in listening ULP sockets (CVE-2023-0461)

• hw: cpu: AMD CPUs may transiently execute beyond unconditional direct branch (CVE-2021-26341)

• malicious data for FBIOPUT_VSCREENINFO ioctl may cause OOB write memory (CVE-2021-33655)

• possible race condition in drivers/tty/tty_buffers.c (CVE-2022-1462)

• KVM: NULL pointer dereference in kvm_mmu_invpcid_gva (CVE-2022-1789)

• use-after-free in free_pipe_info() could lead to privilege escalation (CVE-2022-1882)

• KVM: nVMX: missing IBPB when exiting from nested guest can lead to Spectre v2 attacks (CVE-2022-2196)

• netfilter: nf_conntrack_irc message handling issue (CVE-2022-2663)

• race condition in xfrm_probe_algs can lead to OOB read/write (CVE-2022-3028)

• out-of-bounds read in fib_nh_match of the file net/ipv4/fib_semantics.c (CVE-2022-3435)

• race condition in hugetlb_no_page() in mm/hugetlb.c (CVE-2022-3522)

• memory leak in ipv6_renew_options() (CVE-2022-3524)

• data races around icsk->icsk_af_ops in do_ipv6_setsockopt (CVE-2022-3566)

• data races around sk->sk_prot (CVE-2022-3567)

• memory leak in l2cap_recv_acldata of the file net/bluetooth/l2cap_core.c (CVE-2022-3619)

• denial of service in follow_page_pte in mm/gup.c due to poisoned pte entry (CVE-2022-3623)

• use-after-free after failed devlink reload in devlink_param_get (CVE-2022-3625)

• USB-accessible buffer overflow in brcmfmac (CVE-2022-3628)

• use after free flaw in l2cap_conn_del in net/bluetooth/l2cap_core.c (CVE-2022-3640)

• Double-free in split_2MB_gtt_entry when function intel_gvt_dma_map_guest_page failed (CVE-2022-3707)

• mptcp: NULL pointer dereference in subflow traversal at disconnect time (CVE-2022-4128)

• l2tp: missing lock when clearing sk_user_data can lead to NULL pointer dereference (CVE-2022-4129)

• igmp: use-after-free in ip_check_mc_rcu when opening and closing inet sockets (CVE-2022-20141)

• lockdown bypass using IMA (CVE-2022-21505)

• double free in usb_8dev_start_xmit in drivers/net/can/usb/usb_8dev.c (CVE-2022-28388)

• network backend may cause Linux netfront to use freed SKBs (XSA-405) (CVE-2022-33743)

• unmap_mapping_range() race with munmap() on VM_PFNMAP mappings leads to stale TLB entry (CVE-2022-39188)

• TLB flush operations are mishandled in certain KVM_VCPU_PREEMPTED leading to guest malfunctioning (CVE-2022-39189)

• u8 overflow problem in cfg80211_update_notlisted_nontrans() (CVE-2022-41674)

• use-after-free related to leaf anon_vma double reuse (CVE-2022-42703)

• use-after-free in bss_ref_get in net/wireless/scan.c (CVE-2022-42720)

• BSS list corruption in cfg80211_add_nontrans_list in net/wireless/scan.c (CVE-2022-42721)

• Denial of service in beacon protection for P2P-device (CVE-2022-42722)

• memory corruption in usbmon driver (CVE-2022-43750)

• NULL pointer dereference in traffic control subsystem (CVE-2022-47929)

• NULL pointer dereference in rawv6_push_pending_frames (CVE-2023-0394)

• use-after-free due to race condition in qdisc_graft() (CVE-2023-0590)

• use-after-free caused by invalid pointer hostname in fs/cifs/connect.c (CVE-2023-1195)

• denial of service in tipc_conn_close (CVE-2023-1382)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 9.2 Release Notes linked from the References section.