RHSA-2026:1661MediumCVSS 7.8

Red Hat Security Advisory: kernel-rt security update

Published
February 2, 2026
Last Modified
August 4, 2026

🔗 CVE IDs covered (10)

CVE-2025-40258 →CVE-2022-50865 →CVE-2025-38024 →CVE-2025-38415 →CVE-2025-38459 →CVE-2025-40271 →CVE-2025-40322 →CVE-2024-26766 →CVE-2025-38022 →CVE-2025-39760 →

📋 Description

CVE-2022-50865 — kernel: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() CVE-2024-26766 — kernel: IB/hfi1: Fix sdma.h tx->num_descs off-by-one error CVE-2025-38022 — kernel: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem CVE-2025-38024 — kernel: Linux kernel: RDMA/rxe use-after-free vulnerability leading to potential arbitrary code execution CVE-2025-38415 — kernel: Linux kernel: Memory corruption in Squashfs due to incorrect block size calculation CVE-2025-38459 — kernel: Linux kernel: Denial of Service in ATM CLIP module via infinite recursion CVE-2025-39760 — kernel: Linux kernel: Denial of Service via out-of-bounds read in USB configuration parsing CVE-2025-40258 — kernel: mptcp: fix race condition in mptcp_schedule_work() CVE-2025-40271 — kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service. CVE-2025-40322 — kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling

🎯 Affected products32

  • Red Hat Enterprise Linux NFV (v. 8)
  • Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-0:4.18.0-553.100.1.rt7.441.el8_10.src as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-0:4.18.0-553.100.1.rt7.441.el8_10.src as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-core-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-core-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-core-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-core-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-debuginfo-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-debuginfo-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-devel-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-devel-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-kvm-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-modules-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-modules-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debug-modules-extra-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debug-modules-extra-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debuginfo-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debuginfo-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-devel-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-devel-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • kernel-rt-kvm-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-modules-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
  • kernel-rt-modules-0:4.18.0-553.100.1.rt7.441.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
  • +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: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: To mitigate this issue, prevent the `rxe` kernel module from loading. This can be achieved by creating a blacklist rule. 1. Create a file `/etc/modprobe.d/blacklist-rxe.conf` with the following content: ``` blacklist rxe install rxe /bin/true ``` 2. Rebuild the initial ramdisk: ```bash dracut -f -v ``` 3. Reboot the system for the changes to take effect. Warning: Blacklisting the `rxe` module may impact functionality that relies on Soft RoCE. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: If enabled, you may disable MPTCP support. For more information please read https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/getting-started-with-multipath-tcp_configuring-and-managing-networking#preparing-rhel-to-enable-mptcp-support_getting-started-with-multipath-tcp Workaround: To mitigate this issue, prevent the `fbdev` kernel module from loading if it is not required for system operation. Create a file named `/etc/modprobe.d/disable-fbdev.conf` with the following content: ``` install fbdev /bin/true blacklist fbdev ``` After creating the file, regenerate the initramfs using `dracut -f -v` and reboot the system for the changes to take effect. This mitigation may impact systems that rely on `fbdev` for console display or specific graphics hardware, requiring careful evaluation before implementation.

🔗 References (13)