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OpenAdvisories
Medium ALSA-2025:19932 3 CVEs

Moderate: kernel-rt security update

Published Nov 10, 2025 · 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: x86/vmscape: Add conditional IBPB mitigation (CVE-2025-40300)
* kernel: mm: fix zswap writeback race condition (CVE-2023-53178)
* kernel: fs: fix UAF/GPF bug in nilfs_mdt_destroy (CVE-2022-50367)

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 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.83.1.rt7.424.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.83.1.rt7.424.el8_10

Vulnerabilities 3

  • High 7.8
    CVE-2022-50367

    fs: fix UAF/GPF bug in nilfs_mdt_destroy

    In the Linux kernel, the following vulnerability has been resolved: fs: fix UAF/GPF bug in nilfs_mdt_destroy In alloc_inode, inode_init_always() could return -ENOMEM if security_inode_alloc() fails, which causes inode->i_private uninitialized. Then nilfs_is_m…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2023-53178

    mm: fix zswap writeback race condition

    In the Linux kernel, the following vulnerability has been resolved: mm: fix zswap writeback race condition The zswap writeback mechanism can cause a race condition resulting in memory corruption, where a swapped out page gets swapped in with data that was wri…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Unscored —
    CVE-2025-40300

    x86/vmscape: Add conditional IBPB mitigation

    In the Linux kernel, the following vulnerability has been resolved: x86/vmscape: Add conditional IBPB mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing …

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2022-50367
  • report
    https://access.redhat.com/security/cve/CVE-2023-53178
  • report
    https://access.redhat.com/security/cve/CVE-2025-40300
  • report
    https://bugzilla.redhat.com/2394627
  • report
    https://bugzilla.redhat.com/2395358
  • report
    https://bugzilla.redhat.com/2396114
  • advisory
    https://errata.almalinux.org/8/ALSA-2025-19932.html