CVE-2023-31084 Denial of service in n/a
A deadlock in the Linux kernel DVB frontend driver allows local attackers to cause a denial of service by triggering a blocking operation while the task is not running.
- 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-2023-31084?
CVE-2023-31084 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 24 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in drivers/media/dvb-core/dvb_frontend.c in the Linux kernel 6.2. There is a blocking operation when a task is in !TASK_RUNNING. In dvb_frontend_get_event, wait_event_interruptible is called; the condition is dvb_frontend_test_event(fepriv,events). In dvb_frontend_test_event, down(&fepriv->sem) is called. However, wait_event_interruptible would put the process to sleep, and down(&fepriv->sem) may block the process.
Weakness: CWE-833
Which versions are affected by CVE-2023-31084?
It affects 4 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Linux kernel, Netapp H410c Firmware.
How do I fix CVE-2023-31084?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-31084 being exploited?
There is no known exploitation of CVE-2023-31084 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-28505, AZL-34803, DEBIAN-CVE-2023-31084, GHSA-f886-x4w4-9rwj, UBUNTU-CVE-2023-31084.