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High ALSA-2026:77500 3 CVEs

Important: kernel-rt security update

Published Oct 7, 2026 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

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

Security Fix(es):

* kernel: vsock/vmci: fix UAF when peer resets connection during handshake (CVE-2026-64115)
* kernel: packet: use consistent hard_header_len in non-ring send paths ()
* kernel: packet: use consistent hard_header_len in non-ring send paths (CVE-2026-74582)
* kernel: svcrdma: Reject inline replies that overflow the pull-up buffer (CVE-2026-89530)

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 10

ReleasePackageFixed in
AlmaLinux · 8 kernel-rt 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.172.1.rt7.513.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.172.1.rt7.513.el8_10

Vulnerabilities 3

  • Critical 9.8
    CVE-2026-89530

    svcrdma: Reject inline replies that overflow the pull-up buffer

    In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject inline replies that overflow the pull-up buffer An RPC-over-RDMA client can request a reply, such as an NFS READ payload, without providing a Write list or a Reply chunk to ca…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 8.8
    CVE-2026-64115

    vsock/vmci: fix UAF when peer resets connection during handshake

    In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: fix UAF when peer resets connection during handshake vmci_transport_recv_connecting_server() returned err = 0 for a peer RST in its default switch arm: err = pkt->type == VMCI_TRA…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2026-74582

    packet: use consistent hard_header_len in non-ring send paths

    In the Linux kernel, the following vulnerability has been resolved: packet: use consistent hard_header_len in non-ring send paths packet_snd() reads dev->hard_header_len multiple times while allocating and constructing an skb. Device reconfiguration can chang…

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-64115
  • report
    https://access.redhat.com/security/cve/CVE-2026-74582
  • report
    https://access.redhat.com/security/cve/CVE-2026-89530
  • report
    https://bugzilla.redhat.com/2502593
  • report
    https://bugzilla.redhat.com/2519475
  • report
    https://bugzilla.redhat.com/2521057
  • report
    https://bugzilla.redhat.com/2532218
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-77500.html