CVE-2026-23019 net: marvell: prestera: fix NULL dereference on devlink_alloc() failure
A NULL pointer dereference in the Marvell Prestera network driver causes a kernel crash if devlink allocation fails, leading to denial of service.
- 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-2026-23019?
CVE-2026-23019 is a medium-severity vulnerability in Linux kernel, published on 31 Jan 2026. 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:
net: marvell: prestera: fix NULL dereference on devlink_alloc() failure
devlink_alloc() may return NULL on allocation failure, but prestera_devlink_alloc() unconditionally calls devlink_priv() on the returned pointer.
This leads to a NULL pointer dereference if devlink allocation fails. Add a check for a NULL devlink pointer and return NULL early to avoid the crash.
Weakness: CWE-476
Which versions are affected by CVE-2026-23019?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23019?
Apply the vendor's patch.
Is CVE-2026-23019 being exploited?
There is no known exploitation of CVE-2026-23019 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23019, DEBIAN-CVE-2026-23019, GHSA-xw9f-vg47-m9mf, ROOT-OS-DEBIAN-11-CVE-2026-23019, ROOT-OS-DEBIAN-12-CVE-2026-23019, ROOT-OS-DEBIAN-13-CVE-2026-23019 and 3 more.