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High ALSA-2026:93436 7 CVEs

Important: kernel security update

Published Nov 2, 2026 · Updated Nov 9, 2026

Ecosystem: AlmaLinux

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() (CVE-2026-63924)
* kernel: ipv6: exthdrs: refresh nh after handling HAO option (CVE-2026-63922)
* kernel: af_unix: Fix UAF read of tail->len in unix_stream_data_wait() (CVE-2026-64109)
* kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE (CVE-2026-72083)
* kernel: tipc: require net admin for TIPCv2 netlink mutators (CVE-2026-74283)
* kernel: smb: client: bound dirent name against end of SMB response in cifs_filldir (CVE-2026-93787)
* kernel: ZDI-CAN-33367: Linux Kernel skbuff skb_zerocopy Improper Ownership Management Local Privilege Escalation Vulnerability ()

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.

Fixed packages 25

ReleasePackageFixed in
AlmaLinux · 8 bpftool 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-abi-stablelists 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-core 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-cross-headers 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-debug 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-debug-core 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-debug-devel 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-debug-modules 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-debug-modules-extra 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-devel 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-doc 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-headers 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-modules 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-modules-extra 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-tools 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-tools-libs 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-tools-libs-devel 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-zfcpdump 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-zfcpdump-core 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-zfcpdump-devel 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-zfcpdump-modules 4.18.0-553.181.1.el8_10
AlmaLinux · 8 kernel-zfcpdump-modules-extra 4.18.0-553.181.1.el8_10
AlmaLinux · 8 perf 4.18.0-553.181.1.el8_10
AlmaLinux · 8 python3-perf 4.18.0-553.181.1.el8_10

Vulnerabilities 7

  • 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
  • Unscored —
    CVE-2026-99284

    net: skbuff: propagate shared-frag marker in skb_zerocopy()

    In the Linux kernel, the following vulnerability has been resolved: net: skbuff: propagate shared-frag marker in skb_zerocopy() skb_zerocopy() moves frag descriptors from @from into @to and takes a reference on each frag, but it does not copy skb_shinfo(from)…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-63922
  • report
    https://access.redhat.com/security/cve/CVE-2026-63924
  • report
    https://access.redhat.com/security/cve/CVE-2026-64109
  • report
    https://access.redhat.com/security/cve/CVE-2026-72083
  • report
    https://access.redhat.com/security/cve/CVE-2026-74283
  • report
    https://access.redhat.com/security/cve/CVE-2026-93787
  • report
    https://bugzilla.redhat.com/2502326
  • report
    https://bugzilla.redhat.com/2502327
  • report
    https://bugzilla.redhat.com/2502615
  • report
    https://bugzilla.redhat.com/2516579
  • report
    https://bugzilla.redhat.com/2516935
  • report
    https://bugzilla.redhat.com/2540555
  • report
    https://bugzilla.redhat.com/2559835
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-93436.html
  • report
    https://www.redhat.com/security/data/cve/CVE-2026-99284.html