CVE-2024-35808 md/dm-raid: don't call md_reap_sync_thread() directly
A race condition in the Linux kernel's md/dm-raid module can lead to system instability or denial of service due to unsafe concurrent access to protected fields.
- 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-2024-35808?
CVE-2024-35808 is a high-severity vulnerability in Linux kernel, published on 17 May 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:
md/dm-raid: don't call md_reap_sync_thread() directly
Currently md_reap_sync_thread() is called from raid_message() directly without holding 'reconfig_mutex', this is definitely unsafe because md_reap_sync_thread() can change many fields that is protected by 'reconfig_mutex'.
However, hold 'reconfig_mutex' here is still problematic because this will cause deadlock, for example, commit 130443d60b1b ("md: refactor idle/frozen_sync_thread() to fix deadlock").
Fix this problem by using stop_sync_thread() to unregister sync_thread, like md/raid did.
Weakness: CWE-667
Which versions are affected by CVE-2024-35808?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-35808?
Apply the vendor's patch.
Is CVE-2024-35808 being exploited?
There is no known exploitation of CVE-2024-35808 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-62827, AZL-67587, BELL-CVE-2024-35808, DEBIAN-CVE-2024-35808, GHSA-xx3r-74m7-rjg4, ROOT-OS-DEBIAN-11-CVE-2024-35808 and 3 more.