CVE-2021-46949 sfc: farch: fix TX queue lookup in TX flush done handling
A null pointer dereference in the Linux kernel sfc driver can cause a system panic during TX flush handling, 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-2021-46949?
CVE-2021-46949 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 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:
sfc: farch: fix TX queue lookup in TX flush done handling
We're starting from a TXQ instance number ('qid'), not a TXQ type, so efx_get_tx_queue() is inappropriate (and could return NULL, leading to panics).
Weakness: CWE-476
Which versions are affected by CVE-2021-46949?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-46949?
Apply the vendor's patch.
Is CVE-2021-46949 being exploited?
There is no known exploitation of CVE-2021-46949 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-46949, GHSA-3fgw-x27j-xm6w, UBUNTU-CVE-2021-46949.