CVE-2025-39763

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

ACPI: APEI: send SIGBUS to current task if synchronous memory error not recovered

If a synchronous error is detected as a result of user-space process

triggering a 2-bit uncorrected error, the CPU will take a synchronous

error exception such as Synchronous External Abort (SEA) on Arm64. The

kernel will queue a memory_failure() work which poisons the related

page, unmaps the page, and then sends a SIGBUS to the process, so that

a system wide panic can be avoided.

However, no memory_failure() work will be queued when abnormal

synchronous errors occur. These errors can include situations like

invalid PA, unexpected severity, no memory failure config support,

invalid GUID section, etc. In such a case, the user-space process will

trigger SEA again. This loop can potentially exceed the platform

firmware threshold or even trigger a kernel hard lockup, leading to a

system reboot.

Fix it by performing a force kill if no me

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References