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High ALSA-2026:45116 4 CVEs

Important: kernel-rt security update

Published Jul 24, 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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
* kernel: xfrm single-frag length not properly limited
* kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)
* kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)

Fixed packages 10

ReleasePackageFixed in
AlmaLinux · 8 kernel-rt 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.147.1.rt7.488.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.147.1.rt7.488.el8_10

Vulnerabilities 4

  • Critical 9.8
    CVE-2026-52993 Public exploit

    tipc: fix double-free in tipc_buf_append()

    In the Linux kernel, the following vulnerability has been resolved: tipc: fix double-free in tipc_buf_append() tipc_msg_validate() can potentially reallocate the skb it is validating, freeing the old one. In tipc_buf_append(), it was being called with a point…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 8.8
    CVE-2026-64561 Public exploit

    KVM: x86: Check for invalid/obsolete root *after* making MMU pages available

    In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Check for invalid/obsolete root *after* making MMU pages available Check for a "stale" page fault, i.e. for an invalid and/or obsolete root, after making MMU pages available for the…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.9
    CVE-2025-40026

    KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O

    In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O When completing emulation of instruction that generated a userspace exit for I/O, don't recheck L1 intercepts as KVM has …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Medium 6.3
    CVE-2026-53059

    dm log: fix out-of-bounds write due to region_count overflow

    In the Linux kernel, the following vulnerability has been resolved: dm log: fix out-of-bounds write due to region_count overflow The local variable region_count in create_log_context() is declared as unsigned int (32-bit), but dm_sector_div_up() returns secto…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-40026
  • report
    https://access.redhat.com/security/cve/CVE-2026-52993
  • report
    https://access.redhat.com/security/cve/CVE-2026-53059
  • report
    https://bugzilla.redhat.com/2406712
  • report
    https://bugzilla.redhat.com/2492277
  • report
    https://bugzilla.redhat.com/2492437
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-45116.html
  • report
    https://www.redhat.com/security/data/cve/CVE-2026-64561.html