CVE-2026-90193
Received
Received - Intake
BaseFortify
Vulnerability report for CVE-2026-90193, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-17
Last updated on: 2026-09-17
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
mailbox: qcom-cpucp: fix PREEMPT_RT self-deadlock in IRQ handler
qcom_cpucp_mbox_irq_fn() calls mbox_chan_received_data() while holding
chan->lock. Under PREEMPT_RT, spin_lock_irqsave() is converted to an
rt_spinlock (rtmutex-based), which tracks ownership and can sleep.
The callback chain triggered by mbox_chan_received_data() eventually
reaches mailbox_clear_channel() -> mbox_send_message() -> add_to_rbuf(),
which attempts to re-acquire the same chan->lock. Since rtmutex detects
the re-entrant lock attempt by the same owner, the thread blocks waiting
for a lock it already holds, causing a permanent deadlock.
This deadlock manifests as 'irq/N-apss_cpucp_mbox' stuck in D state
with the following call trace:
rt_spin_lock -> mbox_send_message -> mailbox_clear_channel ->
scmi_rx_callback -> mbox_chan_received_data [<- held chan->lock here]
Fix by saving chan->cl locally and clearing the HW interrupt register
inside the lock, then invoking mbox_chan_received_data() after releasing
the lock. This preserves the mutual exclusion for chan->cl access while
avoiding the lock re-entrancy that causes the PREEMPT_RT deadlock.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 0e2a9a03106cd5fa0dbc9047675e7645c55e2669 |
| Linux | Linux | 0e2a9a03106cd5fa0dbc9047675e7645c55e2669 |
| Linux | Linux | 0e2a9a03106cd5fa0dbc9047675e7645c55e2669 |
| Linux | Linux | 0e2a9a03106cd5fa0dbc9047675e7645c55e2669 |
| Linux | Linux | 6.11 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
