RHSA-2026:56573: Important: kernel security, bug fix, and enhancement update

Published Aug 19, 2026
·
Updated

Important: kernel security, bug fix, and enhancement update

Other sources

The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): kernel: net: atm: fix crash due to unvalidated vcc pointer in sigdsend() (CVE-2026-31411) kernel: fs/smb/client: fix out-of-bounds read in cifssanitizeprepath (CVE-2026-43112) kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518) Bug Fix(es) and Enhancement(s): RHEL9.4 - s390/pci: Fix pcilgmioinuser() inline assembly [rhel-9.4.z] (JIRA:RHEL-161489) 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.

— Red Hat

Affected Software

173 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for IBM z Systems - 4 years of updates
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux Server - AUS
Red Hat Red Hat Enterprise Linux for ARM 64 - 4 years of updates
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
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Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  2. Upgrade

    Upgrade redhat/bpftool to a version that resolves this vulnerability.

    Fixed in 7.3.0-427.145.1.el9_4
  3. Upgrade

    Upgrade redhat/bpftool-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.3.0-427.145.1.el9_4
  4. Upgrade

    Upgrade redhat/kernel-abi-stablelists to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  5. Upgrade

    Upgrade redhat/kernel-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  6. Upgrade

    Upgrade redhat/kernel-debug to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  7. Upgrade

    Upgrade redhat/kernel-debug-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  8. Upgrade

    Upgrade redhat/kernel-debug-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  9. Upgrade

    Upgrade redhat/kernel-debug-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  10. Upgrade

    Upgrade redhat/kernel-debug-devel-matched to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  11. Upgrade

    Upgrade redhat/kernel-debug-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  12. Upgrade

    Upgrade redhat/kernel-debug-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  13. Upgrade

    Upgrade redhat/kernel-debug-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  14. Upgrade

    Upgrade redhat/kernel-debug-uki-virt to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  15. Upgrade

    Upgrade redhat/kernel-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  16. Upgrade

    Upgrade redhat/kernel-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  17. Upgrade

    Upgrade redhat/kernel-devel-matched to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  18. Upgrade

    Upgrade redhat/kernel-doc to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  19. Upgrade

    Upgrade redhat/kernel-headers to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  20. Upgrade

    Upgrade redhat/kernel-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  21. Upgrade

    Upgrade redhat/kernel-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  22. Upgrade

    Upgrade redhat/kernel-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  23. Upgrade

    Upgrade redhat/kernel-rt-debug-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  24. Upgrade

    Upgrade redhat/kernel-rt-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  25. Upgrade

    Upgrade redhat/kernel-tools to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  26. Upgrade

    Upgrade redhat/kernel-tools-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  27. Upgrade

    Upgrade redhat/kernel-tools-libs to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  28. Upgrade

    Upgrade redhat/kernel-uki-virt to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  29. Upgrade

    Upgrade redhat/libperf-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  30. Upgrade

    Upgrade redhat/perf to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  31. Upgrade

    Upgrade redhat/perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  32. Upgrade

    Upgrade redhat/python3-perf to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  33. Upgrade

    Upgrade redhat/python3-perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  34. Upgrade

    Upgrade redhat/rtla to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  35. Upgrade

    Upgrade redhat/rv to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  36. Upgrade

    Upgrade redhat/kernel-debuginfo-common-ppc64le to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  37. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  38. Upgrade

    Upgrade redhat/kernel-rt-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  39. Upgrade

    Upgrade redhat/kernel-rt-debug to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  40. Upgrade

    Upgrade redhat/kernel-rt-debug-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  41. Upgrade

    Upgrade redhat/kernel-rt-debug-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  42. Upgrade

    Upgrade redhat/kernel-rt-debug-kvm to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  43. Upgrade

    Upgrade redhat/kernel-rt-debug-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  44. Upgrade

    Upgrade redhat/kernel-rt-debug-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  45. Upgrade

    Upgrade redhat/kernel-rt-debug-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  46. Upgrade

    Upgrade redhat/kernel-rt-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  47. Upgrade

    Upgrade redhat/kernel-rt-kvm to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  48. Upgrade

    Upgrade redhat/kernel-rt-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  49. Upgrade

    Upgrade redhat/kernel-rt-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  50. Upgrade

    Upgrade redhat/kernel-rt-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  51. Upgrade

    Upgrade redhat/bpftool to a version that resolves this vulnerability.

    Fixed in 7.3.0-427.145.1.el9_4.aa
  52. Upgrade

    Upgrade redhat/bpftool-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.3.0-427.145.1.el9_4.aa
  53. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  54. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-5.14.0-427.145.1.el9_4.aa
  55. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-core-5.14.0-427.145.1.el9_4.aa
  56. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debug-5.14.0-427.145.1.el9_4.aa
  57. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debug-core-5.14.0-427.145.1.el9_4.aa
  58. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debug-debuginfo-5.14.0-427.145.1.el9_4.aa
  59. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debug-devel-5.14.0-427.145.1.el9_4.aa
  60. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debug-devel-matched-5.14.0-427.145.1.el9_4.aa
  61. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debug-modules-5.14.0-427.145.1.el9_4.aa
  62. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debug-modules-core-5.14.0-427.145.1.el9_4.aa
  63. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debug-modules-extra-5.14.0-427.145.1.el9_4.aa
  64. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-debuginfo-5.14.0-427.145.1.el9_4.aa
  65. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-devel-5.14.0-427.145.1.el9_4.aa
  66. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-devel-matched-5.14.0-427.145.1.el9_4.aa
  67. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-modules-5.14.0-427.145.1.el9_4.aa
  68. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-modules-core-5.14.0-427.145.1.el9_4.aa
  69. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 64k-modules-extra-5.14.0-427.145.1.el9_4.aa
  70. Upgrade

    Upgrade redhat/kernel-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  71. Upgrade

    Upgrade redhat/kernel-debug to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  72. Upgrade

    Upgrade redhat/kernel-debug-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  73. Upgrade

    Upgrade redhat/kernel-debug-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  74. Upgrade

    Upgrade redhat/kernel-debug-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  75. Upgrade

    Upgrade redhat/kernel-debug-devel-matched to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  76. Upgrade

    Upgrade redhat/kernel-debug-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  77. Upgrade

    Upgrade redhat/kernel-debug-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  78. Upgrade

    Upgrade redhat/kernel-debug-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  79. Upgrade

    Upgrade redhat/kernel-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  80. Upgrade

    Upgrade redhat/kernel-debuginfo-common-aarch64 to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  81. Upgrade

    Upgrade redhat/kernel-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  82. Upgrade

    Upgrade redhat/kernel-devel-matched to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  83. Upgrade

    Upgrade redhat/kernel-headers to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  84. Upgrade

    Upgrade redhat/kernel-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  85. Upgrade

    Upgrade redhat/kernel-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  86. Upgrade

    Upgrade redhat/kernel-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  87. Upgrade

    Upgrade redhat/kernel-rt-debug-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  88. Upgrade

    Upgrade redhat/kernel-rt-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  89. Upgrade

    Upgrade redhat/kernel-tools to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  90. Upgrade

    Upgrade redhat/kernel-tools-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  91. Upgrade

    Upgrade redhat/kernel-tools-libs to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  92. Upgrade

    Upgrade redhat/libperf-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  93. Upgrade

    Upgrade redhat/perf to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  94. Upgrade

    Upgrade redhat/perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  95. Upgrade

    Upgrade redhat/python3-perf to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  96. Upgrade

    Upgrade redhat/python3-perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  97. Upgrade

    Upgrade redhat/rtla to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  98. Upgrade

    Upgrade redhat/rv to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4.aa
  99. Upgrade

    Upgrade redhat/kernel-debuginfo-common-s390x to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  100. Upgrade

    Upgrade redhat/kernel-zfcpdump to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  101. Upgrade

    Upgrade redhat/kernel-zfcpdump-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  102. Upgrade

    Upgrade redhat/kernel-zfcpdump-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  103. Upgrade

    Upgrade redhat/kernel-zfcpdump-devel to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  104. Upgrade

    Upgrade redhat/kernel-zfcpdump-devel-matched to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  105. Upgrade

    Upgrade redhat/kernel-zfcpdump-modules to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  106. Upgrade

    Upgrade redhat/kernel-zfcpdump-modules-core to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  107. Upgrade

    Upgrade redhat/kernel-zfcpdump-modules-extra to a version that resolves this vulnerability.

    Fixed in 5.14.0-427.145.1.el9_4
  108. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-43112
  109. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2025-54518
  110. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-31411

Event History

Aug 19, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·12:06 AM
Data Sourced
via Red Hat·12:06 AM
Severity

Frequently Asked Questions

1

Which environments have an explicitly identified hardware or virtualization condition?

The privilege-escalation issue is specifically identified as affecting Xen environments on AMD Zen 2 processors. The advisory does not state whether other processor generations or non-Xen deployments are affected by that issue.

2

Does the advisory identify default configurations or exploitation prerequisites for the ATM and SMB client issues?

No. It identifies an unvalidated VCC pointer in the ATM sigd_send() path and an out-of-bounds read in cifs_sanitize_prepath in the SMB client, but provides no default-configuration status or attacker prerequisites.

3

Are all changes in this update security fixes?

No. In addition to three listed CVEs, the update includes a RHEL 9.4 s390/pci inline-assembly bug fix for __pcilg_mio_inuser().

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