Bug 2467149 (CVE-2025-71285)

Summary: CVE-2025-71285 kernel: net: qrtr: Drop the MHI auto_queue feature for IPCR DL channels
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `qrtr` driver. A race condition in the Modem Host Interface (MHI) `auto_queue` feature for Inter-Processor Communication Router (IPCR) downlink channels can lead to a NULL pointer dereference. This occurs because a callback function may be invoked before the `qrtr` client driver is fully initialized. Successful exploitation of this vulnerability could result in a denial of service, potentially impacting system boot.
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Description OSIDB Bzimport 2026-05-06 13:06:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: qrtr: Drop the MHI auto_queue feature for IPCR DL channels

MHI stack offers the 'auto_queue' feature, which allows the MHI stack to
auto queue the buffers for the RX path (DL channel). Though this feature
simplifies the client driver design, it introduces race between the client
drivers and the MHI stack. For instance, with auto_queue, the 'dl_callback'
for the DL channel may get called before the client driver is fully probed.
This means, by the time the dl_callback gets called, the client driver's
structures might not be initialized, leading to NULL ptr dereference.

Currently, the drivers have to workaround this issue by initializing the
internal structures before calling mhi_prepare_for_transfer_autoqueue().
But even so, there is a chance that the client driver's internal code path
may call the MHI queue APIs before mhi_prepare_for_transfer_autoqueue() is
called, leading to similar NULL ptr dereference. This issue has been
reported on the Qcom X1E80100 CRD machines affecting boot.

So to properly fix all these races, drop the MHI 'auto_queue' feature
altogether and let the client driver (QRTR) manage the RX buffers manually.
In the QRTR driver, queue the RX buffers based on the ring length during
probe and recycle the buffers in 'dl_callback' once they are consumed. This
also warrants removing the setting of 'auto_queue' flag from controller
drivers.

Currently, this 'auto_queue' feature is only enabled for IPCR DL channel.
So only the QRTR client driver requires the modification.
Comment 1 Keith Grant 2026-05-06 16:41:28 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050630-CVE-2025-71285-4521@gregkh/T