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ESB-2026.4172 PUBLISHED CVSS 7.800000190734863 HIGH

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4172 USN-8201-1: Linux kernel (Azure) vulnerabilities 24 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Linux kernel (Azure) Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2026-23409 CVE-2026-23410 CVE-2026-23411 CVE-2026-23408 CVE-2025-21780 CVE-2024-46816 CVE-2022-49072 CVE-2026-23268 CVE-2026-23269 CVE-2025-40215 CVE-2026-23060 CVE-2022-49046 CVE-2024-49927 CVE-2026-23074 CVE-2021-47599 CVE-2022-48875 CVE-2024-56640 CVE-2026-23403 CVE-2026-23404 CVE-2026-23405 CVE-2026-23406 CVE-2026-23407 CVE-2025-37849 Original Bulletin: https://ubuntu.com/security/notices/USN-8201-1 Comment: CVSS (Max): 7.8 CVE-2026-23411 (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% (28th) CVE-2022-49072 2026-04-23 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8201-1: Linux kernel (Azure) vulnerabilities Publication date 22 April 2026 Overview Several security issues were fixed in the Linux kernel. Releases 18.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems Details Qualys discovered that several vulnerabilities existed in the AppArmor Linux kernel Security Module (LSM). An unprivileged local attacker could use these issues to load, replace, and remove arbitrary AppArmor profiles causing denial of service, exposure of sensitive information (kernel memory), local privilege escalation, or possibly escape a container. (LP: #2143853, CVE-2026-23268 , CVE-2026-23269 , CVE-2026-23403 , CVE-2026-23404 , CVE-2026-23405 , CVE-2026-23406 , CVE-2026-23407 , CVE-2026-23408 , CVE-2026-23409 , CVE-2026-23410 , CVE-2026-23411 ) 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 x86 architecture; o Cryptographic API; o GPIO subsystem; o GPU drivers; o I2C subsystem; o BTRFS file system; o XFRM subsystem; o IPv4 networking; o IPv6 networking; o MAC80211 subsystem; o Network traffic control; o SMC sockets --------------------------------------------------------------------------------- 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-5.4.0-1161-azure - 5.4.0-1161.167~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . 18.04 LTS linux-image-azure - 5.4.0.1161.167~18.04.1 Ubuntu Pro Fix available bionic with Ubuntu Pro . linux-image-azure-5.4 - 5.4.0.1161.167~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . --------------------------------------------------------------------------------- References o https://launchpad.net/bugs/2143853 o CVE-2026-23411 o CVE-2026-23410 o CVE-2026-23409 o CVE-2026-23407 o CVE-2026-23406 o CVE-2026-23405 o CVE-2026-23404 o CVE-2026-23403 o CVE-2026-23269 o CVE-2026-23268 o CVE-2026-23074 o CVE-2026-23060 o CVE-2025-40215 o CVE-2025-37849 o CVE-2025-21780 o CVE-2024-56640 o CVE-2024-49927 o CVE-2024-46816 o CVE-2022-49072 o CVE-2022-49046 o CVE-2022-48875 o CVE-2021-47599 --------------------------------------------------------------------------------- Related notices o USN-8203-1 o USN-8200-1 o USN-8200-2 o USN-8188-1 o USN-8165-1 o USN-8164-1 o USN-8163-1 o USN-8163-2 o USN-8162-1 o USN-8159-1 o USN-8159-2 o USN-8159-3 o USN-8152-1 o USN-8149-1 o USN-8149-2 o USN-8149-3 o USN-8148-1 o USN-8148-2 o USN-8148-3 o USN-8148-4 o USN-8148-5 o USN-8148-6 o USN-8148-7 o USN-8145-1 o USN-8145-2 o USN-8145-3 o USN-8145-4 o USN-8145-5 o USN-8143-1 o USN-8143-2 o USN-8142-1 o USN-8141-1 o USN-8126-1 o USN-8112-1 o USN-8112-2 o USN-8112-3 o USN-8112-4 o USN-8112-5 o USN-8107-1 o USN-8098-10 o USN-8098-9 o USN-8098-1 o USN-8098-2 o USN-8098-3 o USN-8098-4 o USN-8098-5 o USN-8098-6 o USN-8098-7 o USN-8098-8 o USN-8074-1 o USN-8074-2 o USN-8070-1 o USN-8070-2 o USN-8070-3 o USN-8060-1 o USN-8060-2 o USN-8060-3 o USN-8060-4 o USN-8060-5 o USN-8060-6 o USN-8060-7 o USN-8052-1 o USN-8052-2 o USN-8034-1 o USN-8034-2 o USN-8033-1 o USN-8033-2 o USN-8033-3 o USN-8033-4 o USN-8033-5 o USN-8033-6 o USN-8033-7 o USN-8033-8 o USN-8031-1 o USN-8031-2 o USN-8031-3 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-7737-1 o USN-7719-1 o USN-7712-1 o USN-7712-2 o USN-7711-1 o USN-7703-1 o USN-7703-2 o USN-7703-3 o USN-7703-4 o USN-7686-1 o USN-7655-1 o USN-7654-1 o USN-7654-2 o USN-7654-3 o USN-7654-4 o USN-7654-5 o USN-7594-1 o USN-7594-2 o USN-7594-3 o USN-7524-1 o USN-7523-1 o USN-7521-1 o USN-7521-2 o USN-7521-3 o USN-7468-1 o USN-7459-1 o USN-7459-2 o USN-7458-1 o USN-7453-1 o USN-7452-1 o USN-7451-1 o USN-7450-1 o USN-7449-1 o USN-7449-2 o USN-7421-1 o USN-7407-1 o USN-7403-1 o USN-7390-1 o USN-7389-1 o USN-7388-1 o USN-7387-1 o USN-7387-3 o USN-7387-2 o USN-7386-1 o USN-7385-1 o USN-7384-1 o USN-7384-2 o USN-7382-1 o USN-7381-1 o USN-7380-1 o USN-7379-1 o USN-7379-2 o USN-7311-1 o USN-7310-1 o USN-7304-1 o USN-7303-1 o USN-7303-2 o USN-7303-3 o USN-7301-1 o USN-7277-1 o USN-7276-1 o USN-7196-1 o USN-7194-1 o USN-7186-1 o USN-7186-2 o USN-7166-1 o USN-7166-2 o USN-7166-3 o USN-7166-4 o USN-7156-1 o USN-7155-1 o USN-7154-1 o USN-7154-2 o LSN-0119-1 --------------------------------------------------------------------------------- - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1
7.800000190734863
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Products

VendorProductVersions
UbuntuLinux kernel (Azure)

Timeline

References

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