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How the mentioned CVE works:
The vulnerability exists within the ARM FF-A (Firmware Framework for Armv8-A) subsystem of the Linux kernel. A mutex lock was used to protect a notifier hashtable. This mutex could be called from a workqueue (ffa_pcpu_irq_notification) that runs in an atomic context, where the kernel cannot sleep. Attempting to acquire a mutex, which can cause a sleep, from this atomic context triggers a kernel warning and can lead to system instability or crashes. The fix replaces the mutex with a read-write lock (rwlock), which allows for non-sleeping read-side locking suitable for atomic contexts, while preserving exclusive access for writers.
DailyCVE Form:
Platform: Linux Kernel
Version: Up to 6.14
Vulnerability : Atomic Sleep
Severity: Critical
date: 2025-07-25
Prediction: 2025-08-01
What Undercode Say:
Analytics:
dmesg | grep "BUG: sleeping function" cat /proc/version find /lib/modules -name "ffa"
// Code snippet showing the lock change // Old: static DEFINE_MUTEX(notif_hash_lock); // New: static DEFINE_RWLOCK(notif_hash_lock);
How Exploit:
Triggering the specific FF-A notification from an interrupt context or the designated workqueue can cause a kernel panic, leading to a denial-of-service condition. Exploitation requires the ability to interact with the FF-A interface.
Protection from this CVE
Update the Linux kernel to a version containing the patch that replaces the mutex with an rwlock. For systems where updating is not immediately possible, consider disabling the affected ARM FF-A functionality if it is not required, through kernel configuration.
Impact:
Kernel panic, system crash, and denial-of-service. The integrity and availability of the entire system are compromised when this vulnerability is triggered.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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