RHSA-2026:95721HighCVSS 8.8

Red Hat Security Advisory: kernel-rt security update

Published
November 5, 2026
Last Modified
November 12, 2026

🔗 CVE IDs covered (10)

CVE-2026-46056 →CVE-2026-46259 →CVE-2026-72243 →CVE-2026-99999 →CVE-2026-43450 →CVE-2026-53062 →CVE-2026-63920 →CVE-2026-63922 →CVE-2026-63924 →CVE-2026-99284 →

📋 Description

CVE-2026-43450 — kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() CVE-2026-46056 — kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers CVE-2026-46259 — kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat() CVE-2026-53062 — kernel: dm cache policy smq: fix missing locks in invalidating cache blocks CVE-2026-63920 — kernel: ipv6: validate extension header length before copying to cmsg CVE-2026-63922 — kernel: ipv6: exthdrs: refresh nh after handling HAO option CVE-2026-63924 — kernel: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() CVE-2026-72243 — kernel: selinux: check connect-related permissions on TCP Fast Open CVE-2026-99284 — kernel: kernel: privilege escalation via missing shared fragment flag in skb_zerocopy CVE-2026-99999 — kernel: ipv4: validate checksum_start before completing checksum

🎯 Affected products13

  • Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-0:3.10.0-1160.169.1.rt56.1321.el7.src as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debug-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debug-debuginfo-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debug-devel-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debuginfo-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-debuginfo-common-x86_64-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-devel-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-doc-0:3.10.0-1160.169.1.rt56.1321.el7.noarch as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-trace-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-trace-debuginfo-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)
  • kernel-rt-trace-devel-0:3.10.0-1160.169.1.rt56.1321.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 7 ELS)

✅ 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. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. 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: To mitigate this issue, TCP Fast Open (TFO) can be disabled if not required by applications. Disabling TFO prevents the vulnerable code path from being exercised, thereby eliminating the SELinux permission bypass. To disable TCP Fast Open: 1. Check the current setting: `sysctl net.ipv4.tcp_fastopen` 2. To disable it temporarily: `sudo sysctl -w net.ipv4.tcp_fastopen=0` 3. To make the change persistent across reboots, add or modify the following line in `/etc/sysctl.conf`: `net.ipv4.tcp_fastopen = 0` 4. Apply the persistent changes: `sudo sysctl -p` Disabling TCP Fast Open may impact the performance of applications that utilize this feature for faster connection establishment. Workaround: Check the virtio-net device name with monitor command "info network": ~~~ (qemu) info network net0: index=0,type=nic,model=virtio-net-pci,macaddr=52:54:00:12:34:57 \ vhost0: index=0,type=tap,ifname=tap-vm0,script=no,downscript=no ~~~ Remove the device and re-add it with csum=off: ~~~ (qemu) device_del net0 (qemu) device_add virtio-net-pci,netdev=vhost0,id=net0,mac=52:54:00:12:34:57,csum=off ~~~

🔗 References (13)