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OpenAdvisories
High ALSA-2026:36348 6 CVEs

Important: kernel-rt security, bug fix, and enhancement update

Published Jul 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: tcp: fix potential race in tcp_v6_syn_recv_sock() (CVE-2026-43198)
* kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() (CVE-2026-43450)
* kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL (CVE-2026-46227)
* kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() (CVE-2026-46209)
* kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat() (CVE-2026-46259)
* kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources (CVE-2025-10263)

Bug Fix(es) and Enhancement(s):

* kernel panic at trailing_symlink while the task wdavdaemon runs even after 4c4f7c19b3c7 (JIRA:AlmaLinux-152759)

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 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.140.1.rt7.481.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.140.1.rt7.481.el8_10

Vulnerabilities 6

  • Critical 9.8
    CVE-2026-43198

    tcp: fix potential race in tcp_v6_syn_recv_sock()

    In the Linux kernel, the following vulnerability has been resolved: tcp: fix potential race in tcp_v6_syn_recv_sock() Code in tcp_v6_syn_recv_sock() after the call to tcp_v4_syn_recv_sock() is done too late. After tcp_v4_syn_recv_sock(), the child socket is a…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Critical 9.1
    CVE-2025-10263 Public exploit

    Arm C1-Ultra, C1-Premium, Neoverse V3 & V3AE, Neoverse V2, Neoverse V1, Neoverse-N2, Neoverse-N1, Cortex-X925, Cortex-X…

    Arm Cortex-X4 Neoverse V3AE Cortex-X925 Debian Ubuntu Alpine
  • High 7.8
    CVE-2026-46209

    drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()

    In the Linux kernel, the following vulnerability has been resolved: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() drm_gem_fb_init_with_funcs() computes sub-sampled plane dimensions using plain integer division: unsigned…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-46227

    sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL

    In the Linux kernel, the following vulnerability has been resolved: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL The SCTP_SENDALL path in sctp_sendmsg() iterates ep->asocs with list_for_each_entry_safe(), which caches the next ent…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-46259

    procfs: fix missing RCU protection when reading real_parent in do_task_stat()

    In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_task_stat() When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent without proper RCU protection, which lea…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Unscored —
    CVE-2026-43450

    netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()

    In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() nfnl_cthelper_dump_table() has a 'goto restart' that jumps to a label inside the for loop body. When the "last" helpe…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-10263
  • report
    https://access.redhat.com/security/cve/CVE-2026-43198
  • report
    https://access.redhat.com/security/cve/CVE-2026-43450
  • report
    https://access.redhat.com/security/cve/CVE-2026-46209
  • report
    https://access.redhat.com/security/cve/CVE-2026-46227
  • report
    https://access.redhat.com/security/cve/CVE-2026-46259
  • report
    https://bugzilla.redhat.com/2467228
  • report
    https://bugzilla.redhat.com/2468228
  • report
    https://bugzilla.redhat.com/2482564
  • report
    https://bugzilla.redhat.com/2482636
  • report
    https://bugzilla.redhat.com/2484477
  • report
    https://bugzilla.redhat.com/2486958
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-36348.html