CVE-2026-43124 pstore: ram_core: fix incorrect success return when vmap() fails
A flaw in the Linux kernel pstore module causes a null pointer dereference when vmap fails, leading to 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-2026-43124?
CVE-2026-43124 is a medium-severity vulnerability in Linux kernel, published on 6 May 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:
pstore: ram_core: fix incorrect success return when vmap() fails
In persistent_ram_vmap(), vmap() may return NULL on failure.
If offset is non-zero, adding offset_in_page(start) causes the function to return a non-NULL pointer even though the mapping failed. persistent_ram_buffer_map() therefore incorrectly returns success.
Subsequent access to prz->buffer may dereference an invalid address and cause crashes.
Add proper NULL checking for vmap() failures.
Weakness: CWE-476
Which versions are affected by CVE-2026-43124?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43124?
Apply the vendor's patch.
Is CVE-2026-43124 being exploited?
There is no known exploitation of CVE-2026-43124 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43124, DEBIAN-CVE-2026-43124, GHSA-8ww7-x5r5-3g8j, ROOT-OS-DEBIAN-11-CVE-2026-43124, ROOT-OS-UBUNTU-2204-CVE-2026-43124, ROOT-OS-UBUNTU-2404-CVE-2026-43124 and 1 more.