CVE-2025-38388

MEDIUM EPSS 1.9%
Published Jul 25, 202511mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Jul 25, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Replace mutex with rwlock to avoid sleep in atomic context The current use of a mutex to protect the notifier hashtable accesses can lead to issues in the atomic context. It results in the below kernel warnings: | BUG: sleeping function called from invalid context at kernel/locking/mutex.c:258 | in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 9, name: kworker/0:0 | preempt_count: 1, expected: 0 | RCU nest depth: 0, expected: 0 | CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.14.0 #4 | Workqueue: ffa_pcpu_irq_notification notif_pcpu_irq_work_fn | Call trace: | show_stack+0x18/0x24 (C) | dump_stack_lvl+0x78/0x90 | dump_stack+0x18/0x24 | __might_resched+0x114/0x170 | __might_sleep+0x48/0x98 | mutex_lock+0x24/0x80 | handle_notif_callbacks+0x54/0xe0 | notif_get_and_handle+0x40/0x88 | generic_exec_single+0x80/0xc0 | smp_call_function_single+0xfc/0x1a0 | notif_pcpu_irq_work_fn+0x2c/0x38 | process_one_work+0x14c/0x2b4 | worker_thread+0x2e4/0x3e0 | kthread+0x13c/0x210 | ret_from_fork+0x10/0x20 To address this, replace the mutex with an rwlock to protect the notifier hashtable accesses. This ensures that read-side locking does not sleep and multiple readers can acquire the lock concurrently, avoiding unnecessary contention and potential deadlocks. Writer access remains exclusive, preserving correctness. This change resolves warnings from lockdep about potential sleep in atomic context.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
1.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥6.7  –  <6.12.37
linuxlinux_kernel*≥6.13  –  <6.15.6
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/31405510a48dcf054abfa5b7b8d70ce1b27d1f13
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8986f8f61b482c0e6efd28f0b2423d9640c20eb1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9ca7a421229bbdfbe2e1e628cff5cfa782720a10
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/31405510a48dcf054abfa5b7b8d70ce1b27d1f13
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8986f8f61b482c0e6efd28f0b2423d9640c20eb1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9ca7a421229bbdfbe2e1e628cff5cfa782720a10
    Patch