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ESB-2026.3765 PUBLISHED CVSS 7.800000190734863 HIGH

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.3765 USN-8145-5: Linux kernel (Azure) vulnerabilities 16 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Linux kernel (Azure) Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2024-46777 CVE-2026-23074 CVE-2026-23060 CVE-2025-21735 CVE-2025-37849 Original Bulletin: https://ubuntu.com/security/notices/USN-8145-5 Comment: CVSS (Max): 7.8 CVE-2026-23074 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) CVSS Source: Ubuntu 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% (22nd) CVE-2025-21735 2026-04-15 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8145-5: Linux kernel (Azure) vulnerabilities Publication date 15 April 2026 Overview Several security issues were fixed in the Linux kernel. Releases 18.04 LTS 14.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud 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 Cryptographic API; o UDF file system; o NFC subsystem; o Network traffic control 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-4.15.0-1199-azure - 4.15.0-1199.214 Ubuntu Pro Fix available with Ubuntu Pro . 18.04 LTS linux-image-azure-4.15 - 4.15.0.1199.167 Ubuntu Pro Fix available bionic with Ubuntu Pro . linux-image-azure-lts-18.04 - 4.15.0.1199.167 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.15.0-1199-azure - 4.15.0-1199.214~14.04.1 Ubuntu Pro 14.04 LTS Fix available with Ubuntu Pro via Legacy Support add-on. trusty linux-image-azure - 4.15.0.1199.214~14.04.1 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. --------------------------------------------------------------------------------- References o CVE-2026-23074 o CVE-2026-23060 o CVE-2025-37849 o CVE-2025-21735 o CVE-2024-46777 Related notices 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-8145-1 o USN-8145-2 o USN-8145-3 o USN-8145-4 o USN-8143-1 o USN-8143-2 o USN-8142-1 o USN-8126-1 o USN-8074-1 o USN-8074-2 o USN-8052-1 o USN-8052-2 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-7653-1 o USN-7652-1 o USN-7651-1 o USN-7651-2 o USN-7651-3 o USN-7651-4 o USN-7651-5 o USN-7651-6 o USN-7640-1 o USN-7602-1 o USN-7594-1 o USN-7594-2 o USN-7594-3 o USN-7593-1 o USN-7540-1 o USN-7539-1 o USN-7521-1 o USN-7521-2 o USN-7521-3 o USN-7518-1 o USN-7517-1 o USN-7517-2 o USN-7517-3 o USN-7516-1 o USN-7516-2 o USN-7516-3 o USN-7516-4 o USN-7516-5 o USN-7516-6 o USN-7516-7 o USN-7516-9 o USN-7516-8 o USN-7512-1 o USN-7511-1 o USN-7511-2 o USN-7511-3 o USN-7510-1 o USN-7510-2 o USN-7510-3 o USN-7510-4 o USN-7510-5 o USN-7510-6 o USN-7510-7 o USN-7510-8 o USN-7196-1 o USN-7194-1 o USN-7156-1 o USN-7155-1 o USN-7154-1 o USN-7154-2 o USN-7144-1 o USN-7123-1 o USN-7119-1 o USN-7100-1 o USN-7100-2 o USN-7088-1 o USN-7088-2 o USN-7088-3 o USN-7088-4 o USN-7088-5 --------------------------------------------------------------------------------- - --------------------------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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