A security vulnerability was found in certain Arm processors used with the Linux kernel. Specifically, these processors could complete a memory cache invalidation step before all related memory writes were visible to the system. This flaw could let a local attacker write to protected memory areas after permissions were revoked, potentially bypassing security controls or increasing their access rights. Additionally, numerous other security issues were discovered in the Linux kernel across many components and hardware architectures. These issues could allow attackers to compromise systems running the affected Linux kernel.
Published 7/9/2026, 9:02:08 amVerified 7/9/2026, 7:51:33 pmRevision 1
In plain language
What this advisory means
A security vulnerability was found in certain Arm processors used with the Linux kernel. Specifically, these processors could complete a memory cache invalidation step before all related memory writes were visible to the system. This flaw could let a local attacker write to protected memory areas after permissions were revoked, potentially bypassing security controls or increasing their access rights. Additionally, numerous other security issues were discovered in the Linux kernel across many components and hardware architectures. These issues could allow attackers to compromise systems running the affected Linux kernel.
Technical explanation
How the issue affects the environment
The key vulnerability involves Arm processors completing a broadcast translation lookaside buffer (TLB) invalidation before memory writes through invalidated translations are globally observed. This timing issue might allow a local attacker to perform memory writes after access permissions have been revoked, thus bypassing memory protection mechanisms or escalating privileges. Furthermore, multiple other security flaws were identified in the Linux kernel subsystems, including those related to ARM64, ARM32, RISC-V, and x86 architectures, as well as various drivers, filesystems, networking subsystems, and security modules. These collectively pose risks of system compromise.
Operational impact
Why teams should care
Exploitation of these vulnerabilities could lead to unauthorized memory access, privilege escalation, or full system compromise, impacting the confidentiality, integrity, and availability of systems running affected Linux kernels on Ubuntu. Organizations using affected systems risk security breaches, data loss, or service disruptions. Prompt action is necessary to mitigate exposure and maintain system security posture.
Immediate action
Update the Linux kernel to version 7.0.0-1013.13 or later by performing a standard system update and rebooting. Due to an unavoidable application binary interface (ABI) change, recompile and reinstall any third-party kernel modules after updating. Follow guidance provided by Ubuntu for kernel updates specific to your Ubuntu release.
Affected and fixed releases
Affected versionsConfirm in the official vendor advisory
Fixed versions7.0.0-1013.13
Temporary risk reduction
No specific workaround is provided in the official advisory aside from applying the update and rebooting the system. Users should ensure third-party kernel modules are rebuilt to maintain compatibility.
Evidence and validation checklist
Official Ubuntu Security Notice USN-8727-1
Mention of CVE-2025-10263 detailing Arm TLB invalidation issue
List of subsystems affected by Linux kernel flaws
Guidance to update kernel version and reboot
Notification of ABI change requiring kernel module recompilation
Authoritative reference
Ubuntu Security Notices
QCS detected and normalized this record from the official source. Vendor guidance remains authoritative.
