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High ELSA-2026-93436 6 CVEs

Important: kernel security update (Oracle Linux 8)

Published Nov 2, 2026 · Updated Nov 2, 2026

Ecosystem: Oracle Linux

Summary

[4.18.0-553.182.1]
- 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]

[4.18.0-553.182.1]
- ipv4: free inet_opt and ireq_opt after an RCU grace period (Davide Caratti) [RHEL-295615] {CVE-2026-98432}

[4.18.0-553.181.1]
- net: skbuff: propagate shared-frag marker in skb_zerocopy() (Xin Long) [RHEL-291583]
- smb: client: bound dirent name against end of SMB response in cifs_filldir (Jorge San Emeterio Villalain) [RHEL-278321] {CVE-2026-93787}
- scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE (CKI Backport Bot) [RHEL-283491] {CVE-2026-72083}
- tipc: require net admin for TIPCv2 netlink mutators (CKI Backport Bot) [RHEL-273171] {CVE-2026-74283}
- ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() (Antoine Tenart) [RHEL-259350] {CVE-2026-63924}
- ipv6: exthdrs: refresh nh after handling HAO option (Antoine Tenart) [RHEL-259375] {CVE-2026-63922}
- af_unix: Fix peek then tail dereference UAF in unix_stream_data_wait() (Jamie Bainbridge) [RHEL-225873] {CVE-2026-64109}

Fixed packages 20

ReleasePackageFixed in
Oracle Linux · 8 bpftool 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-abi-stablelists 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-core 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-cross-headers 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-debug 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-debug-core 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-debug-devel 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-debug-modules 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-debug-modules-extra 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-devel 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-doc 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-headers 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-modules 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-modules-extra 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-tools 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-tools-libs 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 kernel-tools-libs-devel 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 perf 0:4.18.0-553.182.1.el8_10
Oracle Linux · 8 python3-perf 0:4.18.0-553.182.1.el8_10

Vulnerabilities 6

  • Critical 9.8
    CVE-2026-63922

    ipv6: exthdrs: refresh nh after handling HAO option

    In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after handling HAO option ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs. ipv6_dest_hao() may call pskb_expand_head() for a cloned skb,…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Critical 9.8
    CVE-2026-63924

    ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()

    In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() ipv6_hop_jumbo() calls pskb_trim_rcsum(), which can change skb pointers. Let's recompute nh pointer to make sure any change won't mess…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Critical 9.8
    CVE-2026-72083

    scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE

    In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE core_scsi3_emulate_pro_register_and_move() maps the PERSISTENT RESERVE OUT parameter list with transport_kmap_data_sg() …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 8.8
    CVE-2026-64109

    af_unix: Fix UAF read of tail->len in unix_stream_data_wait()

    In the Linux kernel, the following vulnerability has been resolved: af_unix: Fix UAF read of tail->len in unix_stream_data_wait() unix_stream_data_wait() does skb_peek_tail(&sk->sk_receive_queue) without holding any lock that prevents SKBs on that queue from …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 8.1
    CVE-2026-93787

    smb: client: bound dirent name against end of SMB response in cifs_filldir

    In the Linux kernel, the following vulnerability has been resolved: smb: client: bound dirent name against end of SMB response in cifs_filldir cifs_filldir() copies the entry name out of an SMB1 TRANS2_FIND_FIRST / FIND_NEXT response using a length (de.namele…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-74283

    tipc: require net admin for TIPCv2 netlink mutators

    In the Linux kernel, the following vulnerability has been resolved: tipc: require net admin for TIPCv2 netlink mutators TIPCv2 registers mutating generic-netlink operations without admin permission flags. Generic netlink only checks CAP_NET_ADMIN when an oper…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu