Upstream information

CVE-2024-56687 at MITRE

Description

In the Linux kernel, the following vulnerability has been resolved:

usb: musb: Fix hardware lockup on first Rx endpoint request

There is a possibility that a request's callback could be invoked from
usb_ep_queue() (call trace below, supplemented with missing calls):

req->complete from usb_gadget_giveback_request
(drivers/usb/gadget/udc/core.c:999)
usb_gadget_giveback_request from musb_g_giveback
(drivers/usb/musb/musb_gadget.c:147)
musb_g_giveback from rxstate
(drivers/usb/musb/musb_gadget.c:784)
rxstate from musb_ep_restart
(drivers/usb/musb/musb_gadget.c:1169)
musb_ep_restart from musb_ep_restart_resume_work
(drivers/usb/musb/musb_gadget.c:1176)
musb_ep_restart_resume_work from musb_queue_resume_work
(drivers/usb/musb/musb_core.c:2279)
musb_queue_resume_work from musb_gadget_queue
(drivers/usb/musb/musb_gadget.c:1241)
musb_gadget_queue from usb_ep_queue
(drivers/usb/gadget/udc/core.c:300)

According to the docstring of usb_ep_queue(), this should not happen:

"Note that @req's ->complete() callback must never be called from within
usb_ep_queue() as that can create deadlock situations."

In fact, a hardware lockup might occur in the following sequence:

1. The gadget is initialized using musb_gadget_enable().
2. Meanwhile, a packet arrives, and the RXPKTRDY flag is set, raising an
interrupt.
3. If IRQs are enabled, the interrupt is handled, but musb_g_rx() finds an
empty queue (next_request() returns NULL). The interrupt flag has
already been cleared by the glue layer handler, but the RXPKTRDY flag
remains set.
4. The first request is enqueued using usb_ep_queue(), leading to the call
of req->complete(), as shown in the call trace above.
5. If the callback enables IRQs and another packet is waiting, step (3)
repeats. The request queue is empty because usb_g_giveback() removes the
request before invoking the callback.
6. The endpoint remains locked up, as the interrupt triggered by hardware
setting the RXPKTRDY flag has been handled, but the flag itself remains
set.

For this scenario to occur, it is only necessary for IRQs to be enabled at
some point during the complete callback. This happens with the USB Ethernet
gadget, whose rx_complete() callback calls netif_rx(). If called in the
task context, netif_rx() disables the bottom halves (BHs). When the BHs are
re-enabled, IRQs are also enabled to allow soft IRQs to be processed. The
gadget itself is initialized at module load (or at boot if built-in), but
the first request is enqueued when the network interface is brought up,
triggering rx_complete() in the task context via ioctl(). If a packet
arrives while the interface is down, it can prevent the interface from
receiving any further packets from the USB host.

The situation is quite complicated with many parties involved. This
particular issue can be resolved in several possible ways:

1. Ensure that callbacks never enable IRQs. This would be difficult to
enforce, as discovering how netif_rx() interacts with interrupts was
already quite challenging and u_ether is not the only function driver.
Similar "bugs" could be hidden in other drivers as well.
2. Disable MUSB interrupts in musb_g_giveback() before calling the callback
and re-enable them afterwars (by calling musb_{dis,en}able_interrupts(),
for example). This would ensure that MUSB interrupts are not handled
during the callback, even if IRQs are enabled. In fact, it would allow
IRQs to be enabled when releasing the lock. However, this feels like an
inelegant hack.
3. Modify the interrupt handler to clear the RXPKTRDY flag if the request
queue is empty. While this approach also feels like a hack, it wastes
CPU time by attempting to handle incoming packets when the software is
not ready to process them.
4. Flush the Rx FIFO instead of calling rxstate() in musb_ep_restart().
This ensures that the hardware can receive packets when there is at
least one request in the queue. Once I
---truncated---

SUSE information

Overall state of this security issue: New

This issue is currently rated as having moderate severity.

No SUSE Bugzilla entries cross referenced.

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Desktop 15 SP5 kernel-source Analysis
SUSE Linux Enterprise Desktop 15 SP6 kernel-default Analysis
SUSE Linux Enterprise Desktop 15 SP6 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-default Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-source-azure Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-default Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-default Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP6 kernel-default Analysis
SUSE Linux Enterprise High Performance Computing 15 SP6 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP6 kernel-source-azure Analysis
SUSE Linux Enterprise Live Patching 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Live Patching 15 SP5 kernel-source Analysis
SUSE Linux Enterprise Live Patching 15 SP6 kernel-default Analysis
SUSE Linux Enterprise Live Patching 15 SP6 kernel-source Analysis
SUSE Linux Enterprise Micro 5.1 kernel-default Analysis
SUSE Linux Enterprise Micro 5.1 kernel-rt Analysis
SUSE Linux Enterprise Micro 5.1 kernel-source Analysis
SUSE Linux Enterprise Micro 5.1 kernel-source-rt Analysis
SUSE Linux Enterprise Micro 5.2 kernel-default Analysis
SUSE Linux Enterprise Micro 5.2 kernel-rt Analysis
SUSE Linux Enterprise Micro 5.2 kernel-source Analysis
SUSE Linux Enterprise Micro 5.2 kernel-source-rt Analysis
SUSE Linux Enterprise Micro 5.3 kernel-default Analysis
SUSE Linux Enterprise Micro 5.3 kernel-rt Analysis
SUSE Linux Enterprise Micro 5.3 kernel-source Analysis
SUSE Linux Enterprise Micro 5.3 kernel-source-rt Analysis
SUSE Linux Enterprise Micro 5.4 kernel-default Analysis
SUSE Linux Enterprise Micro 5.4 kernel-rt Analysis
SUSE Linux Enterprise Micro 5.4 kernel-source Analysis
SUSE Linux Enterprise Micro 5.4 kernel-source-rt Analysis
SUSE Linux Enterprise Micro 5.5 kernel-default Analysis
SUSE Linux Enterprise Micro 5.5 kernel-source Analysis
SUSE Linux Enterprise Micro 5.5 kernel-source-rt Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP5 kernel-source Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP6 kernel-default Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP6 kernel-source Analysis
SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-source Analysis
SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-default Analysis
SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-source Analysis
SUSE Linux Enterprise Module for Legacy 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Module for Legacy 15 SP5 kernel-source Analysis
SUSE Linux Enterprise Module for Public Cloud 15 SP5 kernel-source-azure Analysis
SUSE Linux Enterprise Module for Public Cloud 15 SP6 kernel-source-azure Analysis
SUSE Linux Enterprise Real Time 15 SP5 kernel-source-rt Unsupported
SUSE Linux Enterprise Real Time 15 SP6 kernel-source-rt Analysis
SUSE Linux Enterprise Server 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Server 15 SP5 kernel-source Analysis
SUSE Linux Enterprise Server 15 SP5 kernel-source-azure Analysis
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default Analysis
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-source Analysis
SUSE Linux Enterprise Server 15 SP6 kernel-default Analysis
SUSE Linux Enterprise Server 15 SP6 kernel-source Analysis
SUSE Linux Enterprise Server 15 SP6 kernel-source-azure Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source-azure Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-default Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source-azure Analysis
SUSE Linux Enterprise Workstation Extension 15 SP5 kernel-default Unsupported
SUSE Linux Enterprise Workstation Extension 15 SP5 kernel-source Unsupported
SUSE Linux Micro 6.0 kernel-default Analysis
SUSE Linux Micro 6.0 kernel-source Analysis
SUSE Linux Micro 6.0 kernel-source-rt Analysis
SUSE Linux Micro 6.1 kernel-default Analysis
SUSE Linux Micro 6.1 kernel-source Analysis
SUSE Linux Micro 6.1 kernel-source-rt Analysis
SUSE Manager Proxy 4.3 kernel-default Analysis
SUSE Manager Proxy 4.3 kernel-source Analysis
SUSE Manager Retail Branch Server 4.3 kernel-default Analysis
SUSE Manager Retail Branch Server 4.3 kernel-source Analysis
SUSE Manager Server 4.3 kernel-default Analysis
SUSE Manager Server 4.3 kernel-source Analysis
SUSE Real Time Module 15 SP5 kernel-source-rt Unsupported
SUSE Real Time Module 15 SP6 kernel-source-rt Analysis
openSUSE Leap 15.5 kernel-default Unsupported
openSUSE Leap 15.5 kernel-source Unsupported
openSUSE Leap 15.5 kernel-source-azure Unsupported
openSUSE Leap 15.5 kernel-source-rt Unsupported
openSUSE Leap 15.6 kernel-default Analysis
openSUSE Leap 15.6 kernel-source Analysis
openSUSE Leap 15.6 kernel-source-azure Analysis
openSUSE Leap 15.6 kernel-source-rt Analysis
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise Desktop 15 SP4 kernel-source Analysis
SUSE Linux Enterprise High Availability Extension 12 SP5 kernel-default Analysis
SUSE Linux Enterprise High Availability Extension 12 SP5 kernel-source Analysis
SUSE Linux Enterprise High Availability Extension 15 SP2 kernel-default Unsupported
SUSE Linux Enterprise High Availability Extension 15 SP2 kernel-source Unsupported
SUSE Linux Enterprise High Performance Computing 15 SP2 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-default Unsupported
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-source Unsupported
SUSE Linux Enterprise High Performance Computing 15 SP3 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-default Analysis
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP4 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-default Unsupported
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-source Unsupported
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default Analysis
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-source Analysis
SUSE Linux Enterprise Live Patching 12 SP5 kernel-default Analysis
SUSE Linux Enterprise Live Patching 12 SP5 kernel-source Analysis
SUSE Linux Enterprise Live Patching 15 SP2 kernel-default Unsupported
SUSE Linux Enterprise Live Patching 15 SP2 kernel-source Unsupported
SUSE Linux Enterprise Live Patching 15 SP3 kernel-default Analysis
SUSE Linux Enterprise Live Patching 15 SP3 kernel-source Analysis
SUSE Linux Enterprise Live Patching 15 SP4 kernel-default Analysis
SUSE Linux Enterprise Live Patching 15 SP4 kernel-source Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP2 kernel-source Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP3 kernel-source Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP4 kernel-source Analysis
SUSE Linux Enterprise Module for Development Tools 15 SP2 kernel-source Analysis
SUSE Linux Enterprise Module for Development Tools 15 SP3 kernel-source Analysis
SUSE Linux Enterprise Module for Development Tools 15 SP4 kernel-source Analysis
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default Analysis
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-source Analysis
SUSE Linux Enterprise Server 12 SP5 kernel-source Analysis
SUSE Linux Enterprise Server 12 SP5 kernel-source-azure Analysis
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default Analysis
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-source Analysis
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-source-azure Analysis
SUSE Linux Enterprise Server 15 SP2 kernel-source Analysis
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default Unsupported
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-source Unsupported
SUSE Linux Enterprise Server 15 SP3 kernel-source Analysis
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default Analysis
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source Analysis
SUSE Linux Enterprise Server 15 SP4 kernel-source Analysis
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default Analysis
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-source Analysis
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-source Analysis
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-source-azure Analysis
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-default Analysis
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-source Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-default Unsupported
SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-source Unsupported
SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-default Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-source Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-source Analysis
Products past their end of life and not receiving proactive updates anymore.
HPE Helion OpenStack 8 kernel-source Unsupported
SUSE CaaS Platform 4.0 kernel-source Analysis
SUSE CaaS Platform Toolchain 3 kernel-source Unsupported
SUSE Enterprise Storage 6 kernel-source Analysis
SUSE Enterprise Storage 7 kernel-source Analysis
SUSE Enterprise Storage 7.1 kernel-source Analysis
SUSE Linux Enterprise Desktop 11 SP4 kernel-source Analysis
SUSE Linux Enterprise Desktop 12 SP2 kernel-source Analysis
SUSE Linux Enterprise Desktop 12 SP3 kernel-source Unsupported
SUSE Linux Enterprise Desktop 12 SP4 kernel-source Analysis
SUSE Linux Enterprise Desktop 15 kernel-source Analysis
SUSE Linux Enterprise Desktop 15 SP1 kernel-source Analysis
SUSE Linux Enterprise Desktop 15 SP2 kernel-source Analysis
SUSE Linux Enterprise Desktop 15 SP3 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP1 kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15-ESPOS kernel-source Analysis
SUSE Linux Enterprise High Performance Computing 15-LTSS kernel-source Analysis
SUSE Linux Enterprise Micro 5.0 kernel-default Analysis
SUSE Linux Enterprise Module for Basesystem 15 kernel-source Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP1 kernel-source Analysis
SUSE Linux Enterprise Module for Development Tools 15 kernel-source Analysis
SUSE Linux Enterprise Module for Development Tools 15 SP1 kernel-source Analysis
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT kernel-source Analysis
SUSE Linux Enterprise Real Time 15 SP2 kernel-source Analysis
SUSE Linux Enterprise Real Time 15 SP3 kernel-source Analysis
SUSE Linux Enterprise Real Time 15 SP3 kernel-source-rt Analysis
SUSE Linux Enterprise Real Time 15 SP4 kernel-source Analysis
SUSE Linux Enterprise Real Time 15 SP4 kernel-source-rt Analysis
SUSE Linux Enterprise Server 11 SP4 kernel-source Analysis
SUSE Linux Enterprise Server 11 SP4 LTSS kernel-default Analysis
SUSE Linux Enterprise Server 11 SP4 LTSS kernel-source Analysis
SUSE Linux Enterprise Server 11 SP4-LTSS kernel-source Analysis
SUSE Linux Enterprise Server 12 SP2 kernel-source Analysis
SUSE Linux Enterprise Server 12 SP2-BCL kernel-source Analysis
SUSE Linux Enterprise Server 12 SP2-ESPOS kernel-source Analysis
SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default Analysis
SUSE Linux Enterprise Server 12 SP2-LTSS kernel-source Analysis
SUSE Linux Enterprise Server 12 SP3 kernel-source Unsupported
SUSE Linux Enterprise Server 12 SP3-BCL kernel-source Unsupported
SUSE Linux Enterprise Server 12 SP3-ESPOS kernel-source Unsupported
SUSE Linux Enterprise Server 12 SP3-LTSS kernel-source Unsupported
SUSE Linux Enterprise Server 12 SP4 kernel-source Analysis
SUSE Linux Enterprise Server 12 SP4-ESPOS kernel-source Analysis
SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default Analysis
SUSE Linux Enterprise Server 12 SP4-LTSS kernel-source Analysis
SUSE Linux Enterprise Server 15 kernel-source Analysis
SUSE Linux Enterprise Server 15 SP1 kernel-source Analysis
SUSE Linux Enterprise Server 15 SP1-BCL kernel-source Analysis
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default Analysis
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-source Analysis
SUSE Linux Enterprise Server 15 SP2-BCL kernel-source Analysis
SUSE Linux Enterprise Server 15 SP3-BCL kernel-source Analysis
SUSE Linux Enterprise Server 15-LTSS kernel-default Analysis
SUSE Linux Enterprise Server 15-LTSS kernel-source Analysis
SUSE Linux Enterprise Server for Raspberry Pi 12 SP2 kernel-source Analysis
SUSE Linux Enterprise Server for SAP Applications 12 SP2 kernel-source Analysis
SUSE Linux Enterprise Server for SAP Applications 12 SP3 kernel-source Unsupported
SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-source Analysis
SUSE Linux Enterprise Server for SAP Applications 15 kernel-source Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-source Analysis
SUSE Manager Proxy 4.0 kernel-source Analysis
SUSE Manager Proxy 4.1 kernel-source Analysis
SUSE Manager Proxy 4.2 kernel-source Analysis
SUSE Manager Retail Branch Server 4.0 kernel-source Analysis
SUSE Manager Retail Branch Server 4.1 kernel-source Analysis
SUSE Manager Retail Branch Server 4.2 kernel-source Analysis
SUSE Manager Server 4.0 kernel-source Analysis
SUSE Manager Server 4.1 kernel-source Analysis
SUSE Manager Server 4.2 kernel-source Analysis
SUSE OpenStack Cloud 7 kernel-source Analysis
SUSE OpenStack Cloud 8 kernel-source Unsupported
SUSE OpenStack Cloud 9 kernel-source Analysis
SUSE OpenStack Cloud Crowbar 8 kernel-source Unsupported
SUSE OpenStack Cloud Crowbar 9 kernel-source Analysis
SUSE Real Time Module 15 SP3 kernel-source-rt Analysis
SUSE Real Time Module 15 SP4 kernel-source-rt Analysis
openSUSE Leap 15.3 kernel-source Analysis
openSUSE Leap 15.3 kernel-source-rt Analysis
openSUSE Leap 15.4 kernel-source Analysis
openSUSE Leap 15.4 kernel-source-azure Analysis
openSUSE Leap 15.4 kernel-source-rt Analysis


SUSE Timeline for this CVE

CVE page created: Sat Dec 28 12:00:20 2024
CVE page last modified: Tue Dec 31 12:05:12 2024