Important: kernel security, bug fix, and enhancement update (Oracle Linux 8)

[4.18.0-553.168.1]
- Update Oracle Linux certificates (Kevin Lyons)
- Disable signing for aarch64 (Ilya Okomin)
- Oracle Linux RHCK Module Signing Key was added to the kernel trusted keys list (olkmod_signing_key.pem) [Orabug: 29539237]
- Update x509.genkey [Orabug: 24817676]
- Conflict with shim-ia32 and shim-x64 <= 15.3-1.0.3
- Remove upstream reference during boot (Kevin Lyons) [Orabug: 34750652]
- Add new Oracle Linux Driver Signing (key 1) certificate [Orabug: 37985772]

[4.18.0-553.168.1]
- pppoe: reload header pointer after dev_hard_header() (Guillaume Nault) [RHEL-237293] {CVE-2026-68121}
- nvme-tcp: reject a read that transferred too few bytes (CKI Backport Bot) [RHEL-263345] {CVE-2026-89480}
- nvme: rename and document nvme_end_request (CKI Backport Bot) [RHEL-263345] {CVE-2026-89480}
- ipvs: do not propagate one-packet flag to synced conns (CKI Backport Bot) [RHEL-255839] {CVE-2026-80714}
- netfilter: nf_queue: hold bridge skb->dev while queued (CKI Backport Bot) [RHEL-231233] {CVE-2026-52912}
- drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib (CKI Backport Bot) [RHEL-221269] {CVE-2026-31566}

[4.18.0-553.167.1]
- net: tun: bound receive headroom (CKI Backport Bot) [RHEL-264385] {CVE-2026-81000}
- xfrm: ah6: validate routing header segments_left (CKI Backport Bot) [RHEL-264314] {CVE-2026-80844}
- scsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read (CKI Backport Bot) [RHEL-262571] {CVE-2026-89846}
- ASoC: SOF: ipc3-control: Validate size in snd_sof_update_control (CKI Backport Bot) [RHEL-243620] {CVE-2026-72261}
- mac802154: llsec: add skb_cow_data() before in-place crypto (Abhishek Rawal) [RHEL-231030] {CVE-2026-63831}
- sctp: don't free the ASCONF's own transport in DEL-IP processing (CKI Backport Bot) [RHEL-234282] {CVE-2026-64564}
- drm/amdgpu: Fix use-after-free race in VM acquire (CKI Backport Bot) [RHEL-222381] {CVE-2026-43370}
- sctp: prevent peer transport count overflow (Xin Long) [RHEL-216297]

[4.18.0-553.166.1]
- crypto: af_alg - Fix incorrect boolean values in af_alg_ctx (CKI Backport Bot) [RHEL-264205] {CVE-2025-39964}
- crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg (CKI Backport Bot) [RHEL-264205] {CVE-2025-39964}

[4.18.0-553.165.1]
- nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path (CKI Backport Bot) [RHEL-260522] {CVE-2026-64534}
- nvmet-tcp: pass iov_len instead of sg->length to bvec_set_page() (Chris Leech) [RHEL-260522] {CVE-2026-64534}
- nvmet-tcp: remove nvmet_tcp_finish_cmd (CKI Backport Bot) [RHEL-260522] {CVE-2026-64534}
- nvmet-tcp: fix NULL pointer dereference during release (Chris Leech) [RHEL-260522] {CVE-2026-64534}
- nvmet-tcp: don't map pages which can't come from HIGHMEM (CKI Backport Bot) [RHEL-260522] {CVE-2026-64534}
- xfs: do not allocate the entire delalloc extent in xfs_bmapi_write (Lukas Herbolt) [RHEL-251578]
- xfs: fix xfs_bmap_add_extent_delay_real for partial conversions (Lukas Herbolt) [RHEL-251578]
- xfs: remove the xfs_iext_peek_prev_extent call in xfs_bmapi_allocate (Lukas Herbolt) [RHEL-251578]
- xfs: pass the actual offset and len to allocate to xfs_bmapi_allocate (Lukas Herbolt) [RHEL-251578]
- xfs: don't open code XFS_FILBLKS_MIN in xfs_bmapi_write (Lukas Herbolt) [RHEL-251578]
- xfs: lift a xfs_valid_startblock into xfs_bmapi_allocate (Lukas Herbolt) [RHEL-251578]
- xfs: remove the unusued tmp_logflags variable in xfs_bmapi_allocate (Lukas Herbolt) [RHEL-251578]
- keys: Pin request_key_auth payload in instantiate paths (Bruno Meneguele) [RHEL-225491] {CVE-2026-63823}
- iommu/vt-d: Remove unnecessary locking in intel_irq_remapping_alloc() (Jakub Brnak) [RHEL-243217]
- iommu/vt-d: Clear Present bit before tearing down PASID entry (Eder Zulian) [RHEL-228475] {CVE-2026-45894}
- iommu/amd: Fix clone_alias() to use the original device's devid (Eder Zulian) [RHEL-227450] {CVE-2026-53053}
- Bluetooth: RFCOMM: Fix session UAF in set_termios (CKI Backport Bot) [RHEL-237326] {CVE-2026-68188}
- net/mlx5: Fix MCIA register buffer overflow on 32 dword reads (CKI Backport Bot) [RHEL-236787] {CVE-2026-68293}
- RDMA/rxe: Fix a use-after-free problem in rxe_mmap (Kamal Heib) [RHEL-233821] {CVE-2026-64582}
- RDMA/rxe: Reject unknown opcodes before ICRC processing (Kamal Heib) [RHEL-226871] {CVE-2026-46133}
- RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv (Kamal Heib) [RHEL-228181] {CVE-2026-46043}
- dm cache policy smq: check allocation under invalidate lock (CKI Backport Bot) [RHEL-231810] {CVE-2026-53062}
- dm cache policy smq: fix missing locks in invalidating cache blocks (CKI Backport Bot) [RHEL-231810] {CVE-2026-53062}
- Bluetooth: HIDP: fix missing length checks in hidp_input_report() (CKI Backport Bot) [RHEL-231060] {CVE-2026-63947}
- Bluetooth: L2CAP: Fix potential user-after-free (CKI Backport Bot) [RHEL-229428] {CVE-2023-54214}
- Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp (CKI Backport Bot) [RHEL-228747] {CVE-2026-63975}
- Bluetooth: SMP: force responder MITM requirements before building the pairing response (CKI Backport Bot) [RHEL-227528] {CVE-2026-43334}
- Bluetooth: Fix race condition in hidp_session_thread (CKI Backport Bot) [RHEL-227382] {CVE-2023-54120}
- Bluetooth: RFCOMM: validate skb length in MCC handlers (CKI Backport Bot) [RHEL-225633] {CVE-2026-53254}
- Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind() (CKI Backport Bot) [RHEL-225571] {CVE-2026-53256}
- Bluetooth: serialize accept_q access (CKI Backport Bot) [RHEL-225535] {CVE-2026-52918}
- Bluetooth: btusb: revert use of devm_kzalloc in btusb (CKI Backport Bot) [RHEL-225154] {CVE-2025-71082}