RHSA-2023:7424HighCVSS 7.8

Red Hat Security Advisory: kernel-rt security update

Published
November 21, 2023
Last Modified
November 6, 2026

🔗 CVE IDs covered (8)

CVE-2023-4206 →CVE-2023-4207 →CVE-2023-4208 →CVE-2023-31436 →CVE-2022-40982 →CVE-2023-3611 →CVE-2023-3776 →CVE-2023-4128 · pending

📋 Description

CVE-2022-40982 — hw: Intel: Gather Data Sampling (GDS) side channel vulnerability CVE-2023-3611 — kernel: net/sched: sch_qfq component can be exploited if in qfq_change_agg function happens qfq_enqueue overhead CVE-2023-3776 — kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function CVE-2023-4128 — kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route CVE-2023-4206 — kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route CVE-2023-4207 — kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route CVE-2023-4208 — kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route CVE-2023-31436 — kernel: out-of-bounds write in qfq_change_class function

🎯 Affected products32

  • Red Hat Enterprise Linux for Real Time (v. 7)
  • Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-0:3.10.0-1160.105.1.rt56.1256.el7.src as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-0:3.10.0-1160.105.1.rt56.1256.el7.src as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-debug-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-debug-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-debug-debuginfo-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-debug-debuginfo-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-debug-devel-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-debug-devel-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-debug-kvm-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-debug-kvm-debuginfo-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-debuginfo-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-debuginfo-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-debuginfo-common-x86_64-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-debuginfo-common-x86_64-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-devel-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-devel-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-doc-0:3.10.0-1160.105.1.rt56.1256.el7.noarch as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-doc-0:3.10.0-1160.105.1.rt56.1256.el7.noarch as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-kvm-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-kvm-debuginfo-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-trace-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-trace-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-trace-debuginfo-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-trace-debuginfo-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • kernel-rt-trace-devel-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7)
  • kernel-rt-trace-devel-0:3.10.0-1160.105.1.rt56.1256.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)
  • +2 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Workaround: The vulnerability can be mitigated by installing the CPU microcode package microcode_ctl version 20230808. Workaround: Mitigation for this issue is to skip loading the affected module sch_qfq onto the system until we have a fix available. This can be done by a blacklist mechanism and will ensure the driver is not loaded at the boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~ Workaround: To mitigate this issue, prevent module cls_fw from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: To mitigate this issue, prevent the module cls_u32 from being loaded by blacklisting the module to prevent it from loading automatically. ~~~ https://access.redhat.com/solutions/41278 ~~~ Workaround: To mitigate this issue, prevent the module, sch_qfq from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.

🔗 References (8)