Moderate: kernel security update (Oracle Linux 8)

[4.18.0-553.115.1]
- 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]

[4.18.0-553.115.1]
- x86/microcode/AMD: Revert 'Backport AMD microcode commits for better microcode loading support' (Waiman Long) [RHEL-155860]
- net/sched: cls_u32: use skb_header_pointer_careful() (Paolo Abeni) [RHEL-150398] {CVE-2026-23204}
- net: add skb_header_pointer_careful() helper (Paolo Abeni) [RHEL-150398]
- tcp: fix forever orphan socket caused by tcp_abort (Paolo Abeni) [RHEL-146187]
- xfs: fix minimum agno handling for xfs alloc modes in RHEL8 (Brian Foster) [RHEL-102464]
- xfs: fix uninitialized use of flags variable in xfs_alloc_vextent() (Brian Foster) [RHEL-102464]
- ipv4/tcp: do not use per netns ctl sockets (Davide Caratti) [RHEL-82523]
- tcp: use this_cpu_read(*X) instead of *this_cpu_ptr(X) (Davide Caratti) [RHEL-82523]
- macvlan: observe an RCU grace period in macvlan_common_newlink() error path (Hangbin Liu) [RHEL-150221]
- macvlan: fix error recovery in macvlan_common_newlink() (CKI Backport Bot) [RHEL-150221] {CVE-2026-23209}
- x86/uprobes: Fix XOL allocation failure for 32-bit tasks (Oleg Nesterov) [RHEL-96016]

[4.18.0-553.114.1]
- s390/kexec: Emit an error message when cmdline is too long (Mete Durlu) [RHEL-144946]
- s390/boot: Fix kernel size in bootparm area (Mete Durlu) [RHEL-144946]
- redhat: genlog: add new JIRA cloud server hostname (Jan Stancek)
- mm/hugetlb: fix excessive IPI broadcasts when unsharing PMD tables using mmu_gather (Rafael Aquini) [RHEL-137123]
- gfs2: Fix data loss during inode evict (Andreas Gruenbacher) [RHEL-151614]
- gfs2: minor evict_[un]linked_inode cleanup (Andreas Gruenbacher) [RHEL-151614]
- gfs2: Remove useless transaction in evict_linked_inode (Andreas Gruenbacher) [RHEL-151614]
- gfs2: Remove unnecessary check in gfs2_evict_inode (Andreas Gruenbacher) [RHEL-151614]
- gfs2: Call unlock_new_inode before d_instantiate (Andreas Gruenbacher) [RHEL-151614]
- gfs2: Don't remember delete unless it's successful (Andreas Gruenbacher) [RHEL-151614]
- gfs2: Remove redundant check for GLF_INSTANTIATE_NEEDED (Andreas Gruenbacher) [RHEL-151614]
- gfs2: fiemap page fault fix (Andreas Gruenbacher) [RHEL-151614]
- gfs2: Don't get stuck writing page onto itself under direct I/O (Andreas Gruenbacher) [RHEL-151614]
- net: atm: fix /proc/net/atm/lec handling (Hangbin Liu) [RHEL-146419] {CVE-2025-38180}
- net: atm: add lec_mutex (Hangbin Liu) [RHEL-146419] {CVE-2025-38323}

[4.18.0-553.113.1]
- scsi: st: Skip buffer flush for information ioctls (John Meneghini) [RHEL-136288]
- scsi: st: Separate st-unique ioctl handling from SCSI common ioctl handling (John Meneghini) [RHEL-136288]
- scsi: core: Fix the unit attention counter implementation (John Meneghini) [RHEL-136288]
- scsi: st: Tighten the page format heuristics with MODE SELECT (John Meneghini) [RHEL-136288]
- scsi: st: ERASE does not change tape location (John Meneghini) [RHEL-136288]
- scsi: st: Fix array overflow in st_setup() (John Meneghini) [RHEL-136288]
- scsi: st: Add sysfs file position_lost_in_reset (John Meneghini) [RHEL-136288]
- scsi: st: Modify st.c to use the new scsi_error counters (John Meneghini) [RHEL-136288]
- scsi: core: Add counters for New Media and Power On/Reset UNIT ATTENTIONs (John Meneghini) [RHEL-136288]
- scsi: st: Restore some drive settings after reset (John Meneghini) [RHEL-136288]
- scsi: st: Fix input/output error on empty drive reset (John Meneghini) [RHEL-136288]

[4.18.0-553.112.1]
- smb: client: handle lack of IPC in dfs_cache_refresh() (Paulo Alcantara) [RHEL-138235]
- smb: client: allow parsing zero-length AV pairs (Paulo Alcantara) [RHEL-138235]
- cifs: reduce warning log level for server not advertising interfaces (Paulo Alcantara) [RHEL-138235]
- smb: client: Fix match_session bug preventing session reuse (Paulo Alcantara) [RHEL-138235]
- smb: client: get rid of kstrdup() in get_ses_refpath() (Paulo Alcantara) [RHEL-138235]
- smb: client: fix noisy when tree connecting to DFS interlink targets (Paulo Alcantara) [RHEL-138235]
- smb: client: don't trust DFSREF_STORAGE_SERVER bit (Paulo Alcantara) [RHEL-138235]
- smb: client: don't check for @leaf_fullpath in match_server() (Paulo Alcantara) [RHEL-138235]
- smb: client: get rid of TCP_Server_Info::refpath_lock (Paulo Alcantara) [RHEL-138235]
- smb: client: don't retry DFS targets on server shutdown (Paulo Alcantara) [RHEL-138235]
- smb: client: fix return value of parse_dfs_referrals() (Paulo Alcantara) [RHEL-138235]
- smb: client: optimize referral walk on failed link targets (Paulo Alcantara) [RHEL-138235]
- smb: client: provide dns_resolve_{unc,name} helpers (Paulo Alcantara) [RHEL-138235]
- smb: client: parse DNS domain name from domain= option (Paulo Alcantara) [RHEL-138235]
- smb: client: fix DFS mount against old servers with NTLMSSP (Paulo Alcantara) [RHEL-138235]
- smb: client: parse av pair type 4 in CHALLENGE_MESSAGE (Paulo Alcantara) [RHEL-138235]
- smb: client: introduce av_for_each_entry() helper (Paulo Alcantara) [RHEL-138235]
- smb: client: fix double free of TCP_Server_Info::hostname (Paulo Alcantara) [RHEL-138235] {CVE-2025-21673}
- smb: client: fix potential race in cifs_put_tcon() (Paulo Alcantara) [RHEL-138235]
- smb: client: fix noisy message when mounting shares (Paulo Alcantara) [RHEL-138235]
- smb: client: don't try following DFS links in cifs_tree_connect() (Paulo Alcantara) [RHEL-138235]
- smb: client: allow reconnect when sending ioctl (Paulo Alcantara) [RHEL-138235]
- smb: client: get rid of @nlsc param in cifs_tree_connect() (Paulo Alcantara) [RHEL-138235]
- smb: client: allow more DFS referrals to