CVE-2022-48630 crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ
An infinite loop in the Qualcomm RNG driver causes a denial of service when processing requests not aligned to word size.
- 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-2022-48630?
CVE-2022-48630 is a medium-severity denial of service vulnerability in Linux kernel, published on 5 Mar 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:
crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ
The commit referenced in the Fixes tag removed the 'break' from the else branch in qcom_rng_read(), causing an infinite loop whenever 'max' is not a multiple of WORD_SZ. This can be reproduced e.g. by running:
kcapi-rng -b 67 >/dev/null
There are many ways to fix this without adding back the 'break', but they all seem more awkward than simply adding it back, so do just that.
Tested on a machine with Qualcomm Amberwing processor.
Weakness: CWE-835
Which versions are affected by CVE-2022-48630?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48630?
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-2022-48630 being exploited?
There is no known exploitation of CVE-2022-48630 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48630, GHSA-4rpf-4vmp-3hfw, UBUNTU-CVE-2022-48630.