GSD-2021-1001821 can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv
A use-after-free vulnerability in the Linux kernel's J1939 CAN subsystem allows local attackers to potentially execute code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is GSD-2021-1001821?
GSD-2021-1001821 is an use after free vulnerability in Kernel, published on 28 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.4.156 by commit a0e47d2833b4f65e6c799f28c6b636d36b8b936d, it was introduced in version v5.4 by commit 9d71dd0c70099914fcd063135da3c580865e924c. For more details please see the references link.
Which versions are affected by GSD-2021-1001821?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1001821?
No fix has been published for GSD-2021-1001821 yet. Limit exposure of the affected software until one is available.
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 GSD-2021-1001821 being exploited?
There is no known exploitation of GSD-2021-1001821 in the wild and no public exploit code.