CVE-2022-48637 bnxt: prevent skb UAF after handing over to PTP worker
A use-after-free vulnerability in the Linux kernel bnxt driver allows attackers to cause denial of service or execute arbitrary code via PTP worker handling.
- 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-2022-48637?
CVE-2022-48637 is a high-severity use after free vulnerability in Linux kernel, published on 28 Apr 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:
bnxt: prevent skb UAF after handing over to PTP worker
When reading the timestamp is required bnxt_tx_int() hands over the ownership of the completed skb to the PTP worker. The skb should not be used afterwards, as the worker may run before the rest of our code and free the skb, leading to a use-after-free.
Since dev_kfree_skb_any() accepts NULL make the loss of ownership more obvious and set skb to NULL.
Weakness: CWE-416
Which versions are affected by CVE-2022-48637?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48637?
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-2022-48637 being exploited?
There is no known exploitation of CVE-2022-48637 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48637, GHSA-whgw-qcmx-gp47, UBUNTU-CVE-2022-48637.