CVE-2023-52481: arm64: errata: Add Cortex-A520 speculative unprivileged load workaround
In the Linux kernel, the following vulnerability has been resolved:
arm64: errata: Add Cortex-A520 speculative unprivileged load workaround
Implement the workaround for ARM Cortex-A520 erratum 2966298. On an affected Cortex-A520 core, a speculatively executed unprivileged load might leak data from a privileged load via a cache side channel. The issue only exists for loads within a translation regime with the same translation (e.g. same ASID and VMID). Therefore, the issue only affects the return to EL0.
The workaround is to execute a TLBI before returning to EL0 after all loads of privileged data. A non-shareable TLBI to any address is sufficient.
The workaround isn't necessary if page table isolation (KPTI) is enabled, but for simplicity it will be. Page table isolation should normally be disabled for Cortex-A520 as it supports the CSV3 feature and the E0PD feature (used when KASLR is enabled).
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2023-52481?
CVE-2023-52481 has a high severity rating due to the potential for accessing sensitive data through speculative execution on affected ARM Cortex-A520 cores.
How do I fix CVE-2023-52481?
To fix CVE-2023-52481, ensure that you update your Linux kernel to the latest version that includes the workaround for Cortex-A520 erratum 2966298.
Which systems are affected by CVE-2023-52481?
CVE-2023-52481 primarily affects systems running the Linux kernel on ARM Cortex-A520 processors.
What does CVE-2023-52481 exploit?
CVE-2023-52481 exploits a design flaw in the Cortex-A520 architecture that allows unprivileged loads to be executed speculatively, potentially leading to data leaks.
Is there a workaround for CVE-2023-52481 if updates cannot be applied?
If immediate updates cannot be applied for CVE-2023-52481, limiting the execution of unprivileged applications on affected systems can help mitigate potential risks.