CVE-2024-56645 can: j1939: j1939_session_new(): fix skb reference counting
A reference counting error in the Linux kernel CAN J1939 protocol allows attackers to trigger a use-after-free, potentially causing system crashes or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-56645?
CVE-2024-56645 is a critical use after free vulnerability in Linux kernel, published on 27 Dec 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:
can: j1939: j1939_session_new(): fix skb reference counting
Since j1939_session_skb_queue() does an extra skb_get() for each new skb, do the same for the initial one in j1939_session_new() to avoid refcount underflow.
[mkl: clean up commit message]
Which versions are affected by CVE-2024-56645?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-56645?
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-2024-56645 being exploited?
There is no known exploitation of CVE-2024-56645 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-56645, DEBIAN-CVE-2024-56645, GHSA-3364-cw6v-mc8j, UBUNTU-CVE-2024-56645.