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High ALSA-2026:72467 13 CVEs

Important: kernel-rt security update

Published Sep 28, 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: fbcon: Set fb_display[i]->mode to NULL when the mode is released (CVE-2025-40323)
* kernel: ext4: fix e4b bitmap inconsistency reports (CVE-2026-45942)
* kernel: drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg (CVE-2026-46230)
* kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing IB (CVE-2026-46204)
* kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing dec msg (CVE-2026-46199)
* kernel: arm64: tlb: Flush walk cache when unsharing PMD tables (CVE-2026-63875)
* kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer (CVE-2026-64034)
* kernel: perf/core: Detach event groups during remove_on_exec (CVE-2026-64556)
* kernel: Linux kernel: libceph stack out-of-bounds write via crafted OSDMap (CVE-2026-68159)
* kernel: libceph: refresh auth->authorizer_buf{,_len} after authorizer update (CVE-2026-68156)
* kernel: Linux kernel (libceph): Denial of Service due to malformed monitor maps (CVE-2026-68155)
* kernel: drm/amdgpu: Fix context pstate override handling (CVE-2026-68273)
* kernel: perf: Reject exited events as group leaders (CVE-2026-74753)

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 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.169.1.rt7.510.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.169.1.rt7.510.el8_10

Vulnerabilities 13

  • Critical 9.8
    CVE-2026-68156

    libceph: refresh auth->authorizer_buf{,_len} after authorizer update

    In the Linux kernel, the following vulnerability has been resolved: libceph: refresh auth->authorizer_buf{,_len} after authorizer update ceph_x_create_authorizer() caches au->buf->vec.iov_base and au->buf->vec.iov_len in struct ceph_auth_handshake. These cach…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Critical 9.8
    CVE-2026-68159

    libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE

    In the Linux kernel, the following vulnerability has been resolved: libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE __decode_pg_temp() decodes an user-controlled length but only rejects values large enough to overflow the allocation; it …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Critical 9.3
    CVE-2026-64034

    net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer

    In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer In mana_hwc_rx_event_handler(), resp->response.hwc_msg_id is read from DMA-coherent memory and bounds-checked, then mana_hwc_h…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2025-40323

    fbcon: Set fb_display[i]->mode to NULL when the mode is released

    In the Linux kernel, the following vulnerability has been resolved: fbcon: Set fb_display[i]->mode to NULL when the mode is released Recently, we discovered the following issue through syzkaller: BUG: KASAN: slab-use-after-free in fb_mode_is_equal+0x285/0x2f0…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2026-45942

    ext4: fix e4b bitmap inconsistency reports

    In the Linux kernel, the following vulnerability has been resolved: ext4: fix e4b bitmap inconsistency reports A bitmap inconsistency issue was observed during stress tests under mixed huge-page workloads. Ext4 reported multiple e4b bitmap check failures like…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-63875

    arm64: tlb: Flush walk cache when unsharing PMD tables

    In the Linux kernel, the following vulnerability has been resolved: arm64: tlb: Flush walk cache when unsharing PMD tables When huge_pmd_unshare() is called to unshare a PMD table, the tlb_unshare_pmd_ptdesc() function sets tlb->unshared_tables=true but the a…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2026-64556

    perf/core: Detach event groups during remove_on_exec

    In the Linux kernel, the following vulnerability has been resolved: perf/core: Detach event groups during remove_on_exec perf_event_remove_on_exec() removes events by calling perf_event_exit_event(). For top-level events, this removes the event from the conte…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-68273

    drm/amdgpu: Fix context pstate override handling

    In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix context pstate override handling There are several problems in the context pstate handling code. The most serious ones are potential use-after-free and NULL pointer dereferenc…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2026-74753

    perf: Reject exited events as group leaders

    In the Linux kernel, the following vulnerability has been resolved: perf: Reject exited events as group leaders perf_event_remove_on_exec() sets remove-on-exec events to the EXIT state and detaches their group relationships. The event's file descriptor can re…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.5
    CVE-2026-68155

    libceph: Reject monmaps advertising zero monitors

    In the Linux kernel, the following vulnerability has been resolved: libceph: Reject monmaps advertising zero monitors A message of type CEPH_MSG_MON_MAP contains a monmap that is sent from a monitor to the client. This monmap contains information about the ex…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.1
    CVE-2026-46199

    drm/amdgpu/vcn4: Prevent OOB reads when parsing dec msg

    In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn4: Prevent OOB reads when parsing dec msg Check bounds against the end of the BO whenever we access the msg.

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.1
    CVE-2026-46204

    drm/amdgpu/vcn4: Prevent OOB reads when parsing IB

    In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn4: Prevent OOB reads when parsing IB Rewrite the IB parsing to use amdgpu_ib_get_value() which handles the bounds checks.

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.1
    CVE-2026-46230

    drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg

    In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg Check bounds against the end of the BO whenever we access the msg.

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-40323
  • report
    https://access.redhat.com/security/cve/CVE-2026-45942
  • report
    https://access.redhat.com/security/cve/CVE-2026-46199
  • report
    https://access.redhat.com/security/cve/CVE-2026-46204
  • report
    https://access.redhat.com/security/cve/CVE-2026-46230
  • report
    https://access.redhat.com/security/cve/CVE-2026-63875
  • report
    https://access.redhat.com/security/cve/CVE-2026-64034
  • report
    https://access.redhat.com/security/cve/CVE-2026-64556
  • report
    https://access.redhat.com/security/cve/CVE-2026-68155
  • report
    https://access.redhat.com/security/cve/CVE-2026-68156
  • report
    https://access.redhat.com/security/cve/CVE-2026-68159
  • report
    https://access.redhat.com/security/cve/CVE-2026-68273
  • report
    https://access.redhat.com/security/cve/CVE-2026-74753
  • report
    https://bugzilla.redhat.com/2419883
  • report
    https://bugzilla.redhat.com/2482104
  • report
    https://bugzilla.redhat.com/2482533
  • report
    https://bugzilla.redhat.com/2482543
  • report
    https://bugzilla.redhat.com/2482649
  • report
    https://bugzilla.redhat.com/2502318
  • report
    https://bugzilla.redhat.com/2502394
  • report
    https://bugzilla.redhat.com/2508319
  • report
    https://bugzilla.redhat.com/2513165
  • report
    https://bugzilla.redhat.com/2513232
  • report
    https://bugzilla.redhat.com/2513295
  • report
    https://bugzilla.redhat.com/2513434
  • report
    https://bugzilla.redhat.com/2524434
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-72467.html