# RHSA-2026:21706: Security update for 23 packages RHSA-2026:21706, released June 24, 2026, fixes 19 CVEs across 23 products. None of them is reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/fix/linux/rhsa-2026-21706 - Platform: Linux - Released: Jun 24, 2026 - Priority: High (Closes CVE-2026-23455, high severity) - CVEs: 19, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://access.redhat.com/errata/RHSA-2026:21706 ## Applies to | Product | Release | Fixed in | |---|---|---| | [bpftool](https://patchblox.com/security/data/product/linux/bpftool.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-abi-stablelists](https://patchblox.com/security/data/product/linux/kernel-abi-stablelists.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-core](https://patchblox.com/security/data/product/linux/kernel-core.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-debug](https://patchblox.com/security/data/product/linux/kernel-debug.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-debug-core](https://patchblox.com/security/data/product/linux/kernel-debug-core.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-debug-devel](https://patchblox.com/security/data/product/linux/kernel-debug-devel.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-debug-modules](https://patchblox.com/security/data/product/linux/kernel-debug-modules.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-debug-modules-extra.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-devel](https://patchblox.com/security/data/product/linux/kernel-devel.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-doc](https://patchblox.com/security/data/product/linux/kernel-doc.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-modules](https://patchblox.com/security/data/product/linux/kernel-modules.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-modules-extra](https://patchblox.com/security/data/product/linux/kernel-modules-extra.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-tools](https://patchblox.com/security/data/product/linux/kernel-tools.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-tools-libs](https://patchblox.com/security/data/product/linux/kernel-tools-libs.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-tools-libs-devel](https://patchblox.com/security/data/product/linux/kernel-tools-libs-devel.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-zfcpdump](https://patchblox.com/security/data/product/linux/kernel-zfcpdump.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-zfcpdump-core](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-core.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-zfcpdump-devel](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-devel.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-zfcpdump-modules](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [kernel-zfcpdump-modules-extra](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules-extra.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [perf](https://patchblox.com/security/data/product/linux/perf.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | | [python3-perf](https://patchblox.com/security/data/product/linux/python3-perf.md) | RHEL 8 | 0:4.18.0-553.126.1.el8_10 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2026-23455](https://patchblox.com/security/data/cve/CVE-2026-23455.md) | High | kernel: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: check for zero leng... | 9.1 | 0.0159 | | | [CVE-2026-46195](https://patchblox.com/security/data/cve/CVE-2026-46195.md) | High | smb: client: validate dacloffset before building DACL pointers | 9.8 | 0.0068 | | | [CVE-2026-31685](https://patchblox.com/security/data/cve/CVE-2026-31685.md) | High | netfilter: ip6t_eui64: reject invalid MAC header for all packets | 9.4 | 0.0049 | | | [CVE-2026-43158](https://patchblox.com/security/data/cve/CVE-2026-43158.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: xfs: fix freemap adjustments when adding xattrs... | 8.8 | 0.0047 | | | [CVE-2026-43190](https://patchblox.com/security/data/cve/CVE-2026-43190.md) | High | kernel: In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_tcpmss: check remaining length befo... | 8.2 | 0.0046 | | | [CVE-2025-71116](https://patchblox.com/security/data/cve/CVE-2025-71116.md) | High | libceph: make decode_pool() more resilient against corrupted osdmaps | 8.1 | 0.0046 | | | [CVE-2026-31709](https://patchblox.com/security/data/cve/CVE-2026-31709.md) | High | smb: client: validate the whole DACL before rewriting it in cifsacl | 8.8 | 0.0035 | | | [CVE-2026-31408](https://patchblox.com/security/data/cve/CVE-2026-31408.md) | High | Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold | 8.8 | 0.0032 | | | [CVE-2026-43051](https://patchblox.com/security/data/cve/CVE-2026-43051.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: HID: wacom: fix out-of-bounds read in wacom_intu... | 8.1 | 0.0026 | | | [CVE-2026-23243](https://patchblox.com/security/data/cve/CVE-2026-23243.md) | High | RDMA/umad: Reject negative data_len in ib_umad_write | 7.8 | 0.0018 | | | [CVE-2025-68347](https://patchblox.com/security/data/cve/CVE-2025-68347.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: ALSA: firewire-motu: fix buffer overflow in hwde... | 7.8 | 0.0018 | | | [CVE-2026-31532](https://patchblox.com/security/data/cve/CVE-2026-31532.md) | High | can: raw: fix ro->uniq use-after-free in raw_rcv() | 8.8 | 0.0017 | | | [CVE-2025-68183](https://patchblox.com/security/data/cve/CVE-2025-68183.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: ima: don't clear IMA_DIGSIG flag when setting or... | 7.8 | 0.0015 | | | [CVE-2025-39981](https://patchblox.com/security/data/cve/CVE-2025-39981.md) | High | Bluetooth: MGMT: Fix possible UAFs | 7.8 | 0.0015 | | | [CVE-2026-23270](https://patchblox.com/security/data/cve/CVE-2026-23270.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: net/sched: Only allow act_ct to bind to clsact/i... | 8.1 | 0.0014 | | | [CVE-2026-43027](https://patchblox.com/security/data/cve/CVE-2026-43027.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_helper: pass helper to e... | 7.8 | 0.0013 | | | [CVE-2026-43020](https://patchblox.com/security/data/cve/CVE-2026-43020.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate LTK enc_size on load... | 7.8 | 0.0013 | | | [CVE-2026-31684](https://patchblox.com/security/data/cve/CVE-2026-31684.md) | High | net: sched: act_csum: validate nested VLAN headers | 7.8 | 0.0012 | | | [CVE-2026-43163](https://patchblox.com/security/data/cve/CVE-2026-43163.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: md/bitmap: fix GPF in write_page caused by resiz... | 8.1 | 0.0009 | | --- Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo