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How the mentioned CVE works
The vulnerability exists within the s390-specific memory management code of the Linux kernel. The `do_secure_storage_access()` function, responsible for handling secure storage access faults, incorrectly attempts to resolve page faults while executing in an atomic context. This context is characterized by a non-zero preempt_count, where operations like taking semaphores are forbidden. When a kernel-space uaccess (user space access) function, such as copy_page_from_iter_atomic(), encounters a non-exported page from secure storage, it triggers a page fault. The fault handler enters do_secure_storage_access(), which then improperly tries to acquire the mmap_lock via a down_read() call. Since this lock acquisition can sleep and the context is atomic, it triggers a “sleeping function called from invalid context” bug, potentially leading to a kernel panic or system instability.
DailyCVE Form
Platform: Linux Kernel
Version: s390 architecture
Vulnerability: Memory Fault
Severity: Critical
Date: 07/25/2025
Prediction: Patch expected 07/31/2025
What Undercode Say:
Analytics
grep -r "do_secure_storage_access" /usr/src/linux/ cat /proc/sys/kernel/tainted dmesg | grep "BUG: sleeping function"
How Exploit:
Crafting specific kernel uaccess operations targeting secure storage pages from an atomic context to trigger a kernel panic, causing a Denial of Service (DoS). Exploitation requires the ability to initiate these operations, potentially through a malicious VM or driver.
Protection from this CVE
Apply kernel patch. Update system.
Impact:
Kernel panic. System crash. Denial of Service.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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