CVE-2024-41036 net: ks8851: Fix deadlock with the SPI chip variant
A deadlock in the ks8851 SPI network driver causes a system hang when SMP is enabled, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-41036?
CVE-2024-41036 is a high-severity vulnerability in Linux kernel, published on 29 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: ks8851: Fix deadlock with the SPI chip variant
When SMP is enabled and spinlocks are actually functional then there is a deadlock with the 'statelock' spinlock between ks8851_start_xmit_spi and ks8851_irq:
watchdog: BUG: soft lockup - CPU#0 stuck for 27s! call trace: queued_spin_lock_slowpath+0x100/0x284 do_raw_spin_lock+0x34/0x44 ks8851_start_xmit_spi+0x30/0xb8 ks8851_start_xmit+0x14/0x20 netdev_start_xmit+0x40/0x6c dev_hard_start_xmit+0x6c/0xbc sch_direct_xmit+0xa4/0x22c __qdisc_run+0x138/0x3fc qdisc_run+0x24/0x3c net_tx_action+0xf8/0x130 handle_softirqs+0x1ac/0x1f0 __do_softirq+0x14/0x20 ____do_softirq+0x10/0x1c call_on_irq_stack+0x3c/0x58 do_softirq_own_stack+0x1c/0x28 __irq_exit_rcu+0x54/0x9c irq_exit_rcu+0x10/0x1c el1_interrupt+0x38/0x50 el1h_64_irq_handler+0x18/0x24 el1h_64_irq+0x64/0x68 __netif_schedule+0x6c/0x80 netif_tx_wake_queue+0x38/0x48 ks8851_irq+0xb8/0x2c8 irq_thread_fn+0x2c/0x74 irq_thread+0x10c/0x1b0 kthread+0xc8/0xd8 ret_from_fork+0x10/0x20
This issue has not been identified earlier because tests were done on a device with SMP disabled and so spinlocks were actually NOPs.
Now use spin_(un)lock_bh for TX queue related locking to avoid execution of softirq work synchronously that would lead to a deadlock.
Weakness: CWE-667
Which versions are affected by CVE-2024-41036?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-41036?
Apply the vendor's patch.
Is CVE-2024-41036 being exploited?
There is no known exploitation of CVE-2024-41036 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-41036, DEBIAN-CVE-2024-41036, GHSA-683c-6fpf-jr2w, ROOT-OS-DEBIAN-11-CVE-2024-41036, ROOT-OS-UBUNTU-2204-CVE-2024-41036, UBUNTU-CVE-2024-41036.