CVE-2024-26825 nfc: nci: free rx_data_reassembly skb on NCI device cleanup
A memory leak in the Linux kernel NFC subsystem allows attackers to cause denial of service by triggering improper cleanup of fragmented packet buffers.
- 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-2024-26825?
CVE-2024-26825 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 17 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:
nfc: nci: free rx_data_reassembly skb on NCI device cleanup
rx_data_reassembly skb is stored during NCI data exchange for processing fragmented packets. It is dropped only when the last fragment is processed or when an NTF packet with NCI_OP_RF_DEACTIVATE_NTF opcode is received. However, the NCI device may be deallocated before that which leads to skb leak.
As by design the rx_data_reassembly skb is bound to the NCI device and nothing prevents the device to be freed before the skb is processed in some way and cleaned, free it on the NCI device cleanup.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Weakness: CWE-459
Which versions are affected by CVE-2024-26825?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2024-26825?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2024-26825 being exploited?
There is no known exploitation of CVE-2024-26825 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2024-26825, DEBIAN-CVE-2024-26825, GHSA-5r2r-xpfw-pmxc, UBUNTU-CVE-2024-26825.