RHSA-2026:18134MediumCVSS 8.7

Red Hat Security Advisory: kernel security update

Published
May 19, 2026
Last Modified
October 9, 2026

🔗 CVE IDs covered (29)

CVE-2024-56633 →CVE-2025-38202 →CVE-2025-38279 →CVE-2025-40134 →CVE-2025-40257 →CVE-2025-30156 →CVE-2025-37980 →CVE-2025-38015 →CVE-2025-40210 →CVE-2025-38097 →CVE-2025-38166 →CVE-2025-38345 →CVE-2026-23040 →CVE-2025-38346 →CVE-2025-40320 →CVE-2026-23243 →CVE-2025-21839 →CVE-2025-38267 →CVE-2025-38405 →CVE-2025-40034 →CVE-2025-38275 →CVE-2025-38441 →CVE-2025-39797 →CVE-2025-39866 →CVE-2025-71117 →CVE-2026-23002 →CVE-2026-23210 →CVE-2025-38470 →CVE-2026-23111 →

📋 Description

CVE-2024-56633 — kernel: tcp_bpf: Fix the sk_mem_uncharge logic in tcp_bpf_sendmsg CVE-2025-21839 — kernel: KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop CVE-2025-30156 — kernel: ceph: kernel: Ceph: exploit of hardcoded IVECs, in a misuse of AES, resulting in authentication bypass CVE-2025-37980 — kernel: block: fix resource leak in blk_register_queue() error path CVE-2025-38015 — kernel: dmaengine: idxd: fix memory leak in error handling path of idxd_alloc CVE-2025-38097 — kernel: espintcp: remove encap socket caching to avoid reference leak CVE-2025-38166 — kernel: bpf: fix ktls panic with sockmap CVE-2025-38202 — kernel: bpf: Check rcu_read_lock_trace_held() in bpf_map_lookup_percpu_elem() CVE-2025-38267 — kernel: ring-buffer: Do not trigger WARN_ON() due to a commit_overrun CVE-2025-38275 — kernel: phy: qcom-qmp-usb: Fix an NULL vs IS_ERR() bug CVE-2025-38279 — kernel: bpf: Do not include stack ptr register in precision backtracking bookkeeping CVE-2025-38345 — kernel: ACPICA: fix acpi operand cache leak in dswstate.c CVE-2025-38346 — kernel: ftrace: Fix UAF when lookup kallsym after ftrace disabled CVE-2025-38405 — kernel: nvmet: fix memory leak of bio integrity CVE-2025-38441 — kernel: netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() CVE-2025-38470 — kernel: net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime CVE-2025-39797 — kernel: xfrm: Duplicate SPI Handling CVE-2025-39866 — kernel: fs: writeback: fix use-after-free in __mark_inode_dirty() CVE-2025-40034 — kernel: PCI/AER: Avoid NULL pointer dereference in aer_ratelimit() CVE-2025-40134 — kernel: dm: fix NULL pointer dereference in __dm_suspend() CVE-2025-40210 — kernel: Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND" CVE-2025-40257 — kernel: Linux kernel MPTCP: Privilege escalation or denial of service via use-after-free in timer handling CVE-2025-40320 — kernel: smb: client: fix potential cfid UAF in smb2_query_info_compound CVE-2025-71117 — kernel: Linux kernel: Denial of Service via deadlock in block layer sysfs store callbacks CVE-2026-23002 — kernel: lib/buildid: use __kernel_read() for sleepable context CVE-2026-23040 — kernel: wifi: mac80211_hwsim: fix typo in frequency notification CVE-2026-23111 — kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check CVE-2026-23210 — kernel: Linux kernel: Denial of Service in ice driver due to race condition during VSI rebuild CVE-2026-23243 — kernel: Linux kernel: Denial of service and memory corruption in RDMA umad

🎯 Affected products200

  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Enterprise Linux BaseOS (v. 10)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • Red Hat Enterprise Linux Real Time (v. 10)
  • Red Hat Enterprise Linux Real Time for NFV (v. 10)
  • kernel-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.7.1.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.7.1.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.7.1.el10_2.src as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-0:6.12.0-211.7.1.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-core-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-core-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • kernel-64k-debug-debuginfo-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux Real Time (v. 10)
  • kernel-64k-debug-devel-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-devel-matched-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debug-modules-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-modules-core-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debug-modules-extra-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • kernel-64k-debuginfo-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux Real Time (v. 10)
  • kernel-64k-devel-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-devel-matched-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • kernel-64k-modules-0:6.12.0-211.7.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • +170 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: To mitigate this issue, Red Hat recommends isolating the Ceph messenger protocol to dedicated internal networks with strict access controls, limiting exposure to potential attackers. Administrators should audit and minimize the number of CephX client credentials in circulation and enforce strong credential management to reduce the risk of low-privilege key compromise. Where possible, deploy msgr2 with on-wire encryption to reduce passive sniffing exposure. It is strongly advised to apply vendor-supplied patches as soon as they are released, upgrade to fixed Ceph versions (Tentacle 20.2.4 or later), and rotate all CephX keys to the new AES-256-CTS-HMAC-SHA384-192 cipher type, prioritizing server-side keys. 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 module nfsd 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 module mac80211_hwsim 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 module nf_tables 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 vulnerability, prevent the `ice` kernel module from loading. This can be achieved by creating a blacklist file for the module. 1. Create a file named `/etc/modprobe.d/blacklist-ice.conf` with the following content: `blacklist ice` 2. Regenerate the initramfs to ensure the blacklist is applied during boot: `dracut -f -v` 3. Reboot the system for the changes to take effect. Warning: Blacklisting the `ice` module may impact network functionality if your system relies on network devices using this driver. Ensure this action is compatible with your system's requirements before proceeding. Workaround: To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

🔗 References (48)