CVE-2024-26775 aoe: avoid potential deadlock at set_capacity
A race condition in the Linux kernel AOE driver can cause a deadlock, leading to a denial of service.
- 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-2024-26775?
CVE-2024-26775 is a medium-severity vulnerability in Linux kernel, published on 3 Apr 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:
aoe: avoid potential deadlock at set_capacity
Move set_capacity() outside of the section procected by (&d->lock). To avoid possible interrupt unsafe locking scenario:
CPU0 CPU1 ---- ---- [1] lock(&bdev->bd_size_lock); local_irq_disable(); [2] lock(&d->lock); [3] lock(&bdev->bd_size_lock); <Interrupt> [4] lock(&d->lock);
*** DEADLOCK ***
Where [1](&bdev->bd_size_lock) hold by zram_add()->set_capacity(). [2]lock(&d->lock) hold by aoeblk_gdalloc(). And aoeblk_gdalloc() is trying to acquire [3](&bdev->bd_size_lock) at set_capacity() call. In this situation an attempt to acquire [4]lock(&d->lock) from aoecmd_cfg_rsp() will lead to deadlock.
So the simplest solution is breaking lock dependency [2](&d->lock) -> [3](&bdev->bd_size_lock) by moving set_capacity() outside.
Weakness: CWE-667
Which versions are affected by CVE-2024-26775?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-26775?
Apply the vendor's patch.
Is CVE-2024-26775 being exploited?
There is no known exploitation of CVE-2024-26775 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-54978, BELL-CVE-2024-26775, DEBIAN-CVE-2024-26775, GHSA-86m3-4q38-6prj, ROOT-OS-DEBIAN-11-CVE-2024-26775, ROOT-OS-UBUNTU-2204-CVE-2024-26775 and 1 more.