CVE-2022-48780 net/smc: Avoid overwriting the copies of clcsock callback functions
A logic error in the Linux kernel's SMC protocol causes an infinite loop during repeated fallbacks, 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-2022-48780?
CVE-2022-48780 is a medium-severity denial of service vulnerability in Linux kernel, published on 16 Jul 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:
net/smc: Avoid overwriting the copies of clcsock callback functions
The callback functions of clcsock will be saved and replaced during the fallback. But if the fallback happens more than once, then the copies of these callback functions will be overwritten incorrectly, resulting in a loop call issue:
clcsk->sk_error_report |- smc_fback_error_report() <------------------------------| |- smc_fback_forward_wakeup() | (loop) |- clcsock_callback() (incorrectly overwritten) | |- smc->clcsk_error_report() ------------------|
So this patch fixes the issue by saving these function pointers only once in the fallback and avoiding overwriting.
Weakness: CWE-835
Which versions are affected by CVE-2022-48780?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48780?
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-2022-48780 being exploited?
There is no known exploitation of CVE-2022-48780 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48780, GHSA-xrhw-whc6-6mj7, UBUNTU-CVE-2022-48780.