CVE-2024-50025 scsi: fnic: Move flush_work initialization out of if block
A missing initialization in the fnic driver causes a kernel warning and potential denial of service during Fibre Channel device rediscovery.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-50025?
CVE-2024-50025 is a medium-severity vulnerability in Linux kernel, published on 21 Oct 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
scsi: fnic: Move flush_work initialization out of if block
After commit 379a58caa199 ("scsi: fnic: Move fnic_fnic_flush_tx() to a work queue"), it can happen that a work item is sent to an uninitialized work queue. This may has the effect that the item being queued is never actually queued, and any further actions depending on it will not proceed.
The following warning is observed while the fnic driver is loaded:
kernel: WARNING: CPU: 11 PID: 0 at ../kernel/workqueue.c:1524 __queue_work+0x373/0x410 kernel: <IRQ> kernel: queue_work_on+0x3a/0x50 kernel: fnic_wq_copy_cmpl_handler+0x54a/0x730 [fnic 62fbff0c42e7fb825c60a55cde2fb91facb2ed24] kernel: fnic_isr_msix_wq_copy+0x2d/0x60 [fnic 62fbff0c42e7fb825c60a55cde2fb91facb2ed24] kernel: __handle_irq_event_percpu+0x36/0x1a0 kernel: handle_irq_event_percpu+0x30/0x70 kernel: handle_irq_event+0x34/0x60 kernel: handle_edge_irq+0x7e/0x1a0 kernel: __common_interrupt+0x3b/0xb0 kernel: common_interrupt+0x58/0xa0 kernel: </IRQ>
It has been observed that this may break the rediscovery of Fibre Channel devices after a temporary fabric failure.
This patch fixes it by moving the work queue initialization out of an if block in fnic_probe().
Which versions are affected by CVE-2024-50025?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50025?
Apply the vendor's patch.
Is CVE-2024-50025 being exploited?
There is no known exploitation of CVE-2024-50025 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-50025, DEBIAN-CVE-2024-50025, GHSA-ppgx-9w2c-p5c8, UBUNTU-CVE-2024-50025.