CVE-2024-43839 bna: adjust 'name' buf size of bna_tcb and bna_ccb structures
A buffer overflow in the Linux kernel bna driver allows attackers to cause memory corruption, potentially leading to code execution or system crashes.
- 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-2024-43839?
CVE-2024-43839 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 17 Aug 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:
bna: adjust 'name' buf size of bna_tcb and bna_ccb structures
To have enough space to write all possible sprintf() args. Currently 'name' size is 16, but the first '%s' specifier may already need at least 16 characters, since 'bnad->netdev->name' is used there.
For '%d' specifiers, assume that they require: * 1 char for 'tx_id + tx_info->tcb[i]->id' sum, BNAD_MAX_TXQ_PER_TX is 8 * 2 chars for 'rx_id + rx_info->rx_ctrl[i].ccb->id', BNAD_MAX_RXP_PER_RX is 16
And replace sprintf with snprintf.
Detected using the static analysis tool - Svace.
Weakness: CWE-787
Which versions are affected by CVE-2024-43839?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2024-43839?
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-2024-43839 being exploited?
There is no known exploitation of CVE-2024-43839 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-51983, BELL-CVE-2024-43839, DEBIAN-CVE-2024-43839, GHSA-gc28-phwf-f5ww, UBUNTU-CVE-2024-43839.