CVE-2023-52646 aio: fix mremap after fork null-deref
A null pointer dereference in the Linux kernel's aio subsystem allows local attackers to cause a denial of service via mremap after fork.
- 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-2023-52646?
CVE-2023-52646 is a medium-severity vulnerability in Linux kernel, published on 26 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:
aio: fix mremap after fork null-deref
Commit e4a0d3e720e7 ("aio: Make it possible to remap aio ring") introduced a null-deref if mremap is called on an old aio mapping after fork as mm->ioctx_table will be set to NULL.
[[email protected]: fix 80 column issue]
Weakness: CWE-476
Which versions are affected by CVE-2023-52646?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52646?
Apply the vendor's patch.
Is CVE-2023-52646 being exploited?
There is no known exploitation of CVE-2023-52646 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52646, DEBIAN-CVE-2023-52646, GHSA-52h9-53cv-vm4j, UBUNTU-CVE-2023-52646.