=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.3897 USN-8186-1: Linux kernel (Real-time) vulnerabilities 20 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Linux kernel (Real-time) Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2025-38232 CVE-2023-53520 CVE-2025-68365 CVE-2025-68725 CVE-2025-38408 CVE-2026-23125 CVE-2026-23128 CVE-2025-68817 CVE-2025-71080 CVE-2023-53662 CVE-2025-71162 CVE-2025-71163 CVE-2025-71185 CVE-2025-71186 CVE-2025-71190 CVE-2025-71191 CVE-2025-71194 CVE-2025-71196 CVE-2025-71197 CVE-2025-71199 CVE-2026-22997 CVE-2026-22999 CVE-2026-23001 CVE-2026-23003 CVE-2026-23011 CVE-2026-23026 CVE-2026-23033 CVE-2026-23037 CVE-2026-23038 CVE-2026-23049 CVE-2026-23056 CVE-2026-23058 CVE-2026-23061 CVE-2026-23063 CVE-2026-23064 CVE-2026-23071 CVE-2026-23073 CVE-2026-23075 CVE-2026-23076 CVE-2026-23078 CVE-2026-23080 CVE-2026-23083 CVE-2026-23084 CVE-2026-23085 CVE-2026-23087 CVE-2026-23089 CVE-2026-23090 CVE-2026-23091 CVE-2026-23093 CVE-2025-38057 CVE-2026-23095 CVE-2026-23096 CVE-2026-23097 CVE-2026-23098 CVE-2026-23099 CVE-2026-23101 CVE-2026-23103 CVE-2026-23105 CVE-2026-23108 CVE-2025-68211 CVE-2023-54207 CVE-2025-38125 CVE-2026-23209 CVE-2025-38591 CVE-2025-40149 CVE-2025-68340 CVE-2025-40164 CVE-2026-23164 CVE-2026-23124 CVE-2026-23120 CVE-2026-22998 CVE-2025-71188 CVE-2026-23119 CVE-2026-23121 CVE-2026-23133 CVE-2026-23145 CVE-2026-23146 CVE-2026-23150 CVE-2026-23167 CVE-2026-23170 CVE-2023-53421 Original Bulletin: https://ubuntu.com/security/notices/USN-8186-1 Comment: CVSS (Max): 7.8 CVE-2026-23209 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) CVSS Source: [Ubuntu], Red Hat, SUSE Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H EPSS (Max): 0.1% (27th) CVE-2025-38057 2026-04-19 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8186-1: Linux kernel (Real-time) vulnerabilities Publication date 17 April 2026 Overview Several security issues were fixed in the Linux kernel. Releases 22.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o linux-intel-iot-realtime - Linux kernel for Intel IoT Real-time platforms o linux-realtime - Linux kernel for Real-time systems Details Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: o ARM64 architecture; o Block layer subsystem; o Drivers core; o Bluetooth drivers; o DMA engine subsystem; o GPU drivers; o HID subsystem; o Intel Trace Hub HW tracing drivers; o IIO ADC drivers; o IRQ chip drivers; o Modular ISDN driver; o LED subsystem; o UACCE accelerator framework; o Ethernet bonding driver; o Network drivers; o STMicroelectronics network drivers; o Ethernet team driver; o NVME drivers; o PHY drivers; o SLIMbus drivers; o W1 Dallas's 1-wire bus driver; o Xen hypervisor drivers; o BTRFS file system; o Ext4 file system; o Network file system (NFS) client; o Network file system (NFS) server daemon; o NTFS3 file system; o SMB network file system; o NFC subsystem; o BPF subsystem; o IRQ subsystem; o Memory management; o Bluetooth subsystem; o CAN network layer; o Networking core; o IPv4 networking; o IPv6 networking; o L2TP protocol; o NET/ROM layer; o Network traffic control; o SCTP protocol; o TLS protocol; o XFRM subsystem; o Creative Sound Blaster X-Fi driver; o USB sound devices --------------------------------------------------------------------------------- Update instructions ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. The problem can be corrected by updating your system to the following package versions: Ubuntu Package Version Release linux-image-5.15.0-1097-intel-iot-realtime - 5.15.0-1097.99 Real-time Real-time kernel available with Ubuntu Pro. linux-image-5.15.0-1104-realtime - 5.15.0-1104.113 Real-time Real-time kernel available with Ubuntu Pro. linux-image-intel-iot-realtime - 5.15.0.1097.101 Real-time Real-time 22.04 LTS kernel available with Ubuntu Pro. jammy linux-image-intel-iot-realtime-5.15 - 5.15.0.1097.101 Real-time Real-time kernel available with Ubuntu Pro. linux-image-realtime - 5.15.0.1104.108 Real-time Real-time kernel available with Ubuntu Pro. linux-image-realtime-5.15 - 5.15.0.1104.108 Real-time Real-time kernel available with Ubuntu Pro. --------------------------------------------------------------------------------- References o CVE-2026-23209 o CVE-2026-23170 o CVE-2026-23167 o CVE-2026-23164 o CVE-2026-23150 o CVE-2026-23146 o CVE-2026-23145 o CVE-2026-23133 o CVE-2026-23128 o CVE-2026-23125 o CVE-2026-23124 o CVE-2026-23121 o CVE-2026-23120 o CVE-2026-23119 o CVE-2026-23108 o CVE-2026-23105 o CVE-2026-23103 o CVE-2026-23101 o CVE-2026-23099 o CVE-2026-23098 o CVE-2026-23097 o CVE-2026-23096 o CVE-2026-23095 o CVE-2026-23093 o CVE-2026-23091 o CVE-2026-23090 o CVE-2026-23089 o CVE-2026-23087 o CVE-2026-23085 o CVE-2026-23084 o CVE-2026-23083 o CVE-2026-23080 o CVE-2026-23078 o CVE-2026-23076 o CVE-2026-23075 o CVE-2026-23073 o CVE-2026-23071 o CVE-2026-23064 o CVE-2026-23063 o CVE-2026-23061 o CVE-2026-23058 o CVE-2026-23056 o CVE-2026-23049 o CVE-2026-23038 o CVE-2026-23037 o CVE-2026-23033 o CVE-2026-23026 o CVE-2026-23011 o CVE-2026-23003 o CVE-2026-23001 o CVE-2026-22999 o CVE-2026-22998 o CVE-2026-22997 o CVE-2025-71199 o CVE-2025-71197 o CVE-2025-71196 o CVE-2025-71194 o CVE-2025-71191 o CVE-2025-71190 o CVE-2025-71188 o CVE-2025-71186 o CVE-2025-71185 o CVE-2025-71163 o CVE-2025-71162 o CVE-2025-71080 o CVE-2025-68817 o CVE-2025-68725 o CVE-2025-68365 o CVE-2025-68340 o CVE-2025-68211 o CVE-2025-40164 o CVE-2025-40149 o CVE-2025-38591 o CVE-2025-38408 o CVE-2025-38232 o CVE-2025-38125 o CVE-2025-38057 o CVE-2023-54207 o CVE-2023-53662 o CVE-2023-53520 o CVE-2023-53421 --------------------------------------------------------------------------------- Related notices o USN-8188-1 o USN-8187-1 o USN-8185-1 o USN-8184-1 o USN-8183-1 o USN-8180-1 o USN-8180-2 o USN-8179-1 o USN-8179-2 o USN-8177-1 o USN-8177-2 o USN-8165-1 o USN-8162-1 o USN-8152-1 o USN-8126-1 o USN-8125-1 o USN-8100-1 o USN-8095-1 o USN-8095-2 o USN-8095-3 o USN-8095-4 o USN-8095-5 o USN-8094-5 o USN-8094-1 o USN-8094-2 o USN-8094-3 o USN-8094-4 o USN-8074-1 o USN-8074-2 o USN-8052-1 o USN-8052-2 o USN-8048-1 o USN-8034-1 o USN-8034-2 o USN-8031-1 o USN-8031-2 o USN-8031-3 o USN-8030-1 o USN-8029-1 o USN-8029-2 o USN-8029-3 o USN-8028-1 o USN-8028-2 o USN-8028-3 o USN-8028-4 o USN-8028-5 o USN-8028-6 o USN-8028-7 o USN-8028-8 o USN-7856-1 o USN-7834-1 o USN-7833-1 o USN-7833-2 o USN-7833-3 o USN-7833-4 o USN-7789-1 o USN-7789-2 o USN-7771-1 o USN-7770-1 o USN-7769-1 o USN-7769-2 o USN-7769-3 --------------------------------------------------------------------------------- - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. 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| Vendor | Product | Versions |
|---|---|---|
| Ubuntu | Linux kernel (Real-time) |