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OpenAdvisories
High RHSA-2026:2821 3 CVEs

Red Hat Security Advisory: kernel-rt security update

Published Feb 18, 2026 · Updated Aug 5, 2026

Ecosystem: Red Hat

Fixed packages 28

ReleasePackageFixed in
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-core 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-core 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-debuginfo 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-devel 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-kvm 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-modules 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debug-modules-extra 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debuginfo 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-debuginfo-common-x86_64 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-devel 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-kvm 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-modules 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::nfv kernel-rt-modules-extra 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-core 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-core 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-debuginfo 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-devel 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-modules 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debug-modules-extra 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debuginfo 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-debuginfo-common-x86_64 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-devel 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-modules 0:4.18.0-553.105.1.rt7.446.el8_10
Red Hat · RHEL 8 enterprise_linux:8::realtime kernel-rt-modules-extra 0:4.18.0-553.105.1.rt7.446.el8_10

Vulnerabilities 3

  • High 8.8
    CVE-2023-53762

    Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync

    In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync Use-after-free can occur in hci_disconnect_all_sync if a connection is deleted by concurrent processing of a controller event. To preve…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 8.1
    CVE-2025-40168

    smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

    In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match(). smc_clc_prfx_match() is called from smc_listen_work() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UA…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-40304

    fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds

    In the Linux kernel, the following vulnerability has been resolved: fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds Add bounds checking to prevent writes past framebuffer boundaries when rendering text near screen edges. Return early if t…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu

References

  • article
    https://access.redhat.com/security/updates/classification/#moderate
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2414482
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2419838
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2419870
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_2821.json
  • report
    https://access.redhat.com/security/cve/CVE-2023-53762
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2023-53762
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2023-53762
  • article
    https://lore.kernel.org/linux-cve-announce/2025120845-CVE-2023-53762-01bc@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2025-40168
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2025-40168
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2025-40168
  • article
    https://lore.kernel.org/linux-cve-announce/2025111256-CVE-2025-40168-bdd5@gregkh/T
  • report
    https://access.redhat.com/security/cve/CVE-2025-40304
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2025-40304
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2025-40304
  • article
    https://lore.kernel.org/linux-cve-announce/2025120820-CVE-2025-40304-47b3@gregkh/T