CVE-2022-48790 nvme: fix a possible use-after-free in controller reset during load
A race condition in the Linux kernel NVMe driver allows a use-after-free during controller reset, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-48790?
CVE-2022-48790 is a critical use after free vulnerability in Linux kernel, published on 16 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
nvme: fix a possible use-after-free in controller reset during load
Unlike .queue_rq, in .submit_async_event drivers may not check the ctrl readiness for AER submission. This may lead to a use-after-free condition that was observed with nvme-tcp.
The race condition may happen in the following scenario: 1. driver executes its reset_ctrl_work 2. -> nvme_stop_ctrl - flushes ctrl async_event_work 3. ctrl sends AEN which is received by the host, which in turn schedules AEN handling 4. teardown admin queue (which releases the queue socket) 5. AEN processed, submits another AER, calling the driver to submit 6. driver attempts to send the cmd ==> use-after-free
In order to fix that, add ctrl state check to validate the ctrl is actually able to accept the AER submission.
This addresses the above race in controller resets because the driver during teardown should: 1. change ctrl state to RESETTING 2. flush async_event_work (as well as other async work elements)
So after 1,2, any other AER command will find the ctrl state to be RESETTING and bail out without submitting the AER.
Weakness: CWE-416
Which versions are affected by CVE-2022-48790?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48790?
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-2022-48790 being exploited?
There is no known exploitation of CVE-2022-48790 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48790, GHSA-c665-4pj5-3qjq, UBUNTU-CVE-2022-48790.