Skip to content
OpenAdvisories
High ALSA-2026:87374 7 CVEs

Important: kernel-rt security update

Published Oct 21, 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: ipv4: raw: reject IP_HDRINCL packets with ihl < 5 (CVE-2026-64114)
* kernel: fuse: re-lock request before returning from fuse_ref_folio() (CVE-2026-64266)
* kernel: ipv4: fib: free fib_alias with kfree_rcu() on insert error path (CVE-2026-64572)
* kernel: ALSA: seq: close a re-opened queue timer in the destructor (CVE-2026-68202)
* kernel: xfs: bounds-check buffer log item's dirty bitmap (CVE-2026-80536)
* kernel: inet: frags: strip GSO state from fragments before reassembly (CVE-2026-80590)
* kernel: vfio/pci: clear vdev->msi_perm after freeing it on init failure (CVE-2026-89777)

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 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.177.1.rt7.518.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.177.1.rt7.518.el8_10

Vulnerabilities 7

  • High 8.8
    CVE-2026-89777

    vfio/pci: clear vdev->msi_perm after freeing it on init failure

    In the Linux kernel, the following vulnerability has been resolved: vfio/pci: clear vdev->msi_perm after freeing it on init failure vfio_msi_cap_len() lazily allocates the per-device MSI permission table: vdev->msi_perm = kmalloc_obj(struct perm_bits, GFP_KER…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 8.6
    CVE-2026-80590

    inet: frags: strip GSO state from fragments before reassembly

    In the Linux kernel, the following vulnerability has been resolved: inet: frags: strip GSO state from fragments before reassembly A virtio_net_hdr (tun/tap, or AF_PACKET with PACKET_VNET_HDR) can mark an IPv4 or IPv6 fragment as GSO; nothing relates gso_type …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 8.4
    CVE-2026-80536

    xfs: bounds-check buffer log item's dirty bitmap

    In the Linux kernel, the following vulnerability has been resolved: xfs: bounds-check buffer log item's dirty bitmap xlog_recover_do_reg_buffer() replays each dirty region described by a buffer log item's bitmap into the buffer read for that item: memcpy(xfs_…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-64114

    ipv4: raw: reject IP_HDRINCL packets with ihl < 5

    In the Linux kernel, the following vulnerability has been resolved: ipv4: raw: reject IP_HDRINCL packets with ihl < 5 raw_send_hdrinc() validates that the caller-supplied IPv4 header fits within the message length: iphlen = iph->ihl * 4; err = -EINVAL; if (ip…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2026-64266

    fuse: re-lock request before returning from fuse_ref_folio()

    In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before returning from fuse_ref_folio() fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-68202

    ALSA: seq: close a re-opened queue timer in the destructor

    In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: close a re-opened queue timer in the destructor queue_delete() closes the queue timer, then frees it. snd_seq_timer_close() clears q->timer->timeri. snd_use_lock_sync() then drains…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Unscored —
    CVE-2026-64572

    ipv4: fib: free fib_alias with kfree_rcu() on insert error path

    In the Linux kernel, the following vulnerability has been resolved: ipv4: fib: free fib_alias with kfree_rcu() on insert error path fib_table_insert() publishes new_fa into the leaf's fa_list with fib_insert_alias() before calling the fib entry notifiers. Whe…

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-64114
  • report
    https://access.redhat.com/security/cve/CVE-2026-64266
  • report
    https://access.redhat.com/security/cve/CVE-2026-64572
  • report
    https://access.redhat.com/security/cve/CVE-2026-68202
  • report
    https://access.redhat.com/security/cve/CVE-2026-80536
  • report
    https://access.redhat.com/security/cve/CVE-2026-80590
  • report
    https://access.redhat.com/security/cve/CVE-2026-89777
  • report
    https://bugzilla.redhat.com/2502486
  • report
    https://bugzilla.redhat.com/2507098
  • report
    https://bugzilla.redhat.com/2511413
  • report
    https://bugzilla.redhat.com/2513245
  • report
    https://bugzilla.redhat.com/2524501
  • report
    https://bugzilla.redhat.com/2525413
  • report
    https://bugzilla.redhat.com/2535066
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-87374.html