# RHSA-2026:21556: Security update for 72 packages RHSA-2026:21556, released June 24, 2026, fixes 20 CVEs across 72 products. None of them is reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/fix/linux/rhsa-2026-21556 - Platform: Linux - Released: Jun 24, 2026 - Priority: Urgent (Closes CVE-2025-68366, rated Critical) - CVEs: 20, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://access.redhat.com/errata/RHSA-2026:21556 ## Applies to | Product | Release | Fixed in | |---|---|---| | [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k](https://patchblox.com/security/data/product/linux/kernel-64k.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-core](https://patchblox.com/security/data/product/linux/kernel-64k-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-debug](https://patchblox.com/security/data/product/linux/kernel-64k-debug.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-debug-core](https://patchblox.com/security/data/product/linux/kernel-64k-debug-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-debug-devel](https://patchblox.com/security/data/product/linux/kernel-64k-debug-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-debug-devel-matched](https://patchblox.com/security/data/product/linux/kernel-64k-debug-devel-matched.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-debug-modules](https://patchblox.com/security/data/product/linux/kernel-64k-debug-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-debug-modules-core](https://patchblox.com/security/data/product/linux/kernel-64k-debug-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-64k-debug-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-devel](https://patchblox.com/security/data/product/linux/kernel-64k-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-devel-matched](https://patchblox.com/security/data/product/linux/kernel-64k-devel-matched.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-modules](https://patchblox.com/security/data/product/linux/kernel-64k-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-modules-core](https://patchblox.com/security/data/product/linux/kernel-64k-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-64k-modules-extra](https://patchblox.com/security/data/product/linux/kernel-64k-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-abi-stablelists](https://patchblox.com/security/data/product/linux/kernel-abi-stablelists.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-core](https://patchblox.com/security/data/product/linux/kernel-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-debug](https://patchblox.com/security/data/product/linux/kernel-debug.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-debug-core](https://patchblox.com/security/data/product/linux/kernel-debug-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-debug-devel](https://patchblox.com/security/data/product/linux/kernel-debug-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-debug-devel-matched](https://patchblox.com/security/data/product/linux/kernel-debug-devel-matched.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-debug-modules](https://patchblox.com/security/data/product/linux/kernel-debug-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-debug-modules-core](https://patchblox.com/security/data/product/linux/kernel-debug-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-debug-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-debug-uki-virt](https://patchblox.com/security/data/product/linux/kernel-debug-uki-virt.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-devel](https://patchblox.com/security/data/product/linux/kernel-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-devel-matched](https://patchblox.com/security/data/product/linux/kernel-devel-matched.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-doc](https://patchblox.com/security/data/product/linux/kernel-doc.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-modules](https://patchblox.com/security/data/product/linux/kernel-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-modules-core](https://patchblox.com/security/data/product/linux/kernel-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-modules-extra](https://patchblox.com/security/data/product/linux/kernel-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt](https://patchblox.com/security/data/product/linux/kernel-rt.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k](https://patchblox.com/security/data/product/linux/kernel-rt-64k.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-core](https://patchblox.com/security/data/product/linux/kernel-rt-64k-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-debug](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-debug-core](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-debug-devel](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-debug-modules](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-debug-modules-core](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-devel](https://patchblox.com/security/data/product/linux/kernel-rt-64k-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-modules](https://patchblox.com/security/data/product/linux/kernel-rt-64k-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-modules-core](https://patchblox.com/security/data/product/linux/kernel-rt-64k-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-64k-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-64k-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-core](https://patchblox.com/security/data/product/linux/kernel-rt-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-debug](https://patchblox.com/security/data/product/linux/kernel-rt-debug.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-debug-core](https://patchblox.com/security/data/product/linux/kernel-rt-debug-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-debug-devel](https://patchblox.com/security/data/product/linux/kernel-rt-debug-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-debug-modules](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-debug-modules-core](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-devel](https://patchblox.com/security/data/product/linux/kernel-rt-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-modules](https://patchblox.com/security/data/product/linux/kernel-rt-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-modules-core](https://patchblox.com/security/data/product/linux/kernel-rt-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-rt-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-tools](https://patchblox.com/security/data/product/linux/kernel-tools.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-tools-libs](https://patchblox.com/security/data/product/linux/kernel-tools-libs.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-tools-libs-devel](https://patchblox.com/security/data/product/linux/kernel-tools-libs-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-uki-virt](https://patchblox.com/security/data/product/linux/kernel-uki-virt.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-uki-virt-addons](https://patchblox.com/security/data/product/linux/kernel-uki-virt-addons.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-zfcpdump](https://patchblox.com/security/data/product/linux/kernel-zfcpdump.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-zfcpdump-core](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-zfcpdump-devel](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-devel.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-zfcpdump-devel-matched](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-devel-matched.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-zfcpdump-modules](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-zfcpdump-modules-core](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules-core.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [kernel-zfcpdump-modules-extra](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules-extra.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [libperf](https://patchblox.com/security/data/product/linux/libperf.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [perf](https://patchblox.com/security/data/product/linux/perf.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [python3-perf](https://patchblox.com/security/data/product/linux/python3-perf.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [rtla](https://patchblox.com/security/data/product/linux/rtla.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | | [rv](https://patchblox.com/security/data/product/linux/rv.md) | RHEL 9 | 0:5.14.0-687.12.1.el9_8 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2025-68366](https://patchblox.com/security/data/cve/CVE-2025-68366.md) | Urgent | linux: In the Linux kernel, the following vulnerability has been resolved: nbd: defer config unlock in nbd_genl_connect Th... | 8.8 | 0.0020 | | | [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-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-2026-43110](https://patchblox.com/security/data/cve/CVE-2026-43110.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: validate bsscfg indices in IF ev... | 8.8 | 0.0027 | | | [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-2025-38653](https://patchblox.com/security/data/cve/CVE-2025-38653.md) | High | proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al | 7.8 | 0.0018 | | | [CVE-2026-43303](https://patchblox.com/security/data/cve/CVE-2026-43303.md) | High | mm/page_alloc: clear page->private in free_pages_prepare() | 7.8 | 0.0017 | | | [CVE-2026-23392](https://patchblox.com/security/data/cve/CVE-2026-23392.md) | High | netfilter: nf_tables: release flowtable after rcu grace period on error | 8.8 | 0.0017 | | | [CVE-2025-71089](https://patchblox.com/security/data/cve/CVE-2025-71089.md) | High | iommu: disable SVA when CONFIG_X86 is set | 7.8 | 0.0016 | | | [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-2025-68724](https://patchblox.com/security/data/cve/CVE-2025-68724.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: crypto: asymmetric_keys - prevent overflow in as... | 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-2026-43023](https://patchblox.com/security/data/cve/CVE-2026-43023.md) | High | kernel: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: fix race conditions in sco_sock_c... | 7.8 | 0.0010 | | --- Data as of 2026-11-07T18:46:35Z 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 Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.