# ALSA-2026:21557: Security update for 75 packages ALSA-2026:21557, released May 28, 2026, fixes 18 CVEs across 75 products. None of them is reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/fix/linux/alsa-2026-21557 - Platform: Linux - Released: May 28, 2026 - Priority: High (Closes CVE-2026-23455, high severity) - CVEs: 18, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://osv.dev/vulnerability/ALSA-2026:21557 ## Applies to | Product | Release | Fixed in | |---|---|---| | [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k](https://patchblox.com/security/data/product/linux/kernel-64k.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-core](https://patchblox.com/security/data/product/linux/kernel-64k-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-debug](https://patchblox.com/security/data/product/linux/kernel-64k-debug.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-debug-core](https://patchblox.com/security/data/product/linux/kernel-64k-debug-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-debug-devel](https://patchblox.com/security/data/product/linux/kernel-64k-debug-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-debug-devel-matched](https://patchblox.com/security/data/product/linux/kernel-64k-debug-devel-matched.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-debug-modules](https://patchblox.com/security/data/product/linux/kernel-64k-debug-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-debug-modules-core](https://patchblox.com/security/data/product/linux/kernel-64k-debug-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-64k-debug-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-devel](https://patchblox.com/security/data/product/linux/kernel-64k-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-devel-matched](https://patchblox.com/security/data/product/linux/kernel-64k-devel-matched.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-modules](https://patchblox.com/security/data/product/linux/kernel-64k-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-modules-core](https://patchblox.com/security/data/product/linux/kernel-64k-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-64k-modules-extra](https://patchblox.com/security/data/product/linux/kernel-64k-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-abi-stablelists](https://patchblox.com/security/data/product/linux/kernel-abi-stablelists.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-core](https://patchblox.com/security/data/product/linux/kernel-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-cross-headers](https://patchblox.com/security/data/product/linux/kernel-cross-headers.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-debug](https://patchblox.com/security/data/product/linux/kernel-debug.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-debug-core](https://patchblox.com/security/data/product/linux/kernel-debug-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-debug-devel](https://patchblox.com/security/data/product/linux/kernel-debug-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-debug-devel-matched](https://patchblox.com/security/data/product/linux/kernel-debug-devel-matched.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-debug-modules](https://patchblox.com/security/data/product/linux/kernel-debug-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-debug-modules-core](https://patchblox.com/security/data/product/linux/kernel-debug-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-debug-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-debug-uki-virt](https://patchblox.com/security/data/product/linux/kernel-debug-uki-virt.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-devel](https://patchblox.com/security/data/product/linux/kernel-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-devel-matched](https://patchblox.com/security/data/product/linux/kernel-devel-matched.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-doc](https://patchblox.com/security/data/product/linux/kernel-doc.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-headers](https://patchblox.com/security/data/product/linux/kernel-headers.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-modules](https://patchblox.com/security/data/product/linux/kernel-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-modules-core](https://patchblox.com/security/data/product/linux/kernel-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-modules-extra](https://patchblox.com/security/data/product/linux/kernel-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-modules-extra-matched](https://patchblox.com/security/data/product/linux/kernel-modules-extra-matched.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt](https://patchblox.com/security/data/product/linux/kernel-rt.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k](https://patchblox.com/security/data/product/linux/kernel-rt-64k.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-core](https://patchblox.com/security/data/product/linux/kernel-rt-64k-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-debug](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-debug-core](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-debug-devel](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-debug-modules](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-debug-modules-core](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-64k-debug-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-devel](https://patchblox.com/security/data/product/linux/kernel-rt-64k-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-modules](https://patchblox.com/security/data/product/linux/kernel-rt-64k-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-modules-core](https://patchblox.com/security/data/product/linux/kernel-rt-64k-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-64k-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-64k-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-core](https://patchblox.com/security/data/product/linux/kernel-rt-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-debug](https://patchblox.com/security/data/product/linux/kernel-rt-debug.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-debug-core](https://patchblox.com/security/data/product/linux/kernel-rt-debug-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-debug-devel](https://patchblox.com/security/data/product/linux/kernel-rt-debug-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-debug-modules](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-debug-modules-core](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-debug-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-devel](https://patchblox.com/security/data/product/linux/kernel-rt-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-modules](https://patchblox.com/security/data/product/linux/kernel-rt-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-modules-core](https://patchblox.com/security/data/product/linux/kernel-rt-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-rt-modules-extra](https://patchblox.com/security/data/product/linux/kernel-rt-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-tools](https://patchblox.com/security/data/product/linux/kernel-tools.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-tools-libs](https://patchblox.com/security/data/product/linux/kernel-tools-libs.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-tools-libs-devel](https://patchblox.com/security/data/product/linux/kernel-tools-libs-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-uki-virt](https://patchblox.com/security/data/product/linux/kernel-uki-virt.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-uki-virt-addons](https://patchblox.com/security/data/product/linux/kernel-uki-virt-addons.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-zfcpdump](https://patchblox.com/security/data/product/linux/kernel-zfcpdump.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-zfcpdump-core](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-zfcpdump-devel](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-devel.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-zfcpdump-devel-matched](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-devel-matched.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-zfcpdump-modules](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-zfcpdump-modules-core](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules-core.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [kernel-zfcpdump-modules-extra](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules-extra.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [libperf](https://patchblox.com/security/data/product/linux/libperf.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [perf](https://patchblox.com/security/data/product/linux/perf.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [python3-perf](https://patchblox.com/security/data/product/linux/python3-perf.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [rtla](https://patchblox.com/security/data/product/linux/rtla.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | | [rv](https://patchblox.com/security/data/product/linux/rv.md) | almalinux 10 | 6.12.0-211.18.1.el10_2 | ## 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-2024-56645](https://patchblox.com/security/data/cve/CVE-2024-56645.md) | High | kernel: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: c... | 7.8 | 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-2026-43110](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-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-2025-68183](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-2026-43205](https://patchblox.com/security/data/cve/CVE-2026-43205.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: validate num_ifs to prevent out-of... | 7.8 | 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-2026-43006](https://patchblox.com/security/data/cve/CVE-2026-43006.md) | High | linux: In the Linux kernel, the following vulnerability has been resolved: io_uring/rsrc: reject zero-length fixed buffer i... | 7.5 | 0.0012 | | | [CVE-2026-23375](https://patchblox.com/security/data/cve/CVE-2026-23375.md) | High | kernel: In the Linux kernel, the following vulnerability has been resolved: mm: thp: deny THP for files on anonymous inodes f... | 7.5 | 0.0012 | | | [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-2026-43116](https://patchblox.com/security/data/cve/CVE-2026-43116.md) | High | netfilter: ctnetlink: ensure safe access to master conntrack | 8.8 | 0.0010 | | | [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 2026-11-07T06:34:28Z 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