CVE-2023-0468 Use after free in Kernel
A use-after-free flaw in the Linux kernel io_uring component can cause a NULL pointer dereference, leading to 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-2023-0468?
CVE-2023-0468 is a medium-severity use after free vulnerability in Linux kernel, published on 25 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A use-after-free flaw was found in io_uring/poll.c in io_poll_check_events in the io_uring subcomponent in the Linux Kernel due to a race condition of poll_refs. This flaw may cause a NULL pointer dereference.
Weakness: CWE-416
Which versions are affected by CVE-2023-0468?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-0468?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2023-0468 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-0468 exists.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-13169, DEBIAN-CVE-2023-0468, GHSA-hx8f-g7m6-933v, UBUNTU-CVE-2023-0468.