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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-43124
• https://git.kernel.org/stable/c/05363abc7625cf18c96e67f50673cd07f11da5e9
• https://git.kernel.org/stable/c/1da904e84de608907662ad8a51ba9c571d61e003
• https://git.kernel.org/stable/c/2c99326dc1c79b7ce3c8dd92929b5ce724ff70eb
• https://git.kernel.org/stable/c/49918dd52615097529811d21ec6074dd02ebe77c
• https://git.kernel.org/stable/c/88d5b28f63c7aac1271784e3b800ed405d1cde75
• https://git.kernel.org/stable/c/8baa234181f632cabacf73e4834a910859e9fcc9
• https://git.kernel.org/stable/c/8d849adfbc3e98417fb541620568db1a759ef441
• https://git.kernel.org/stable/c/d47234840aeb4182ed3ee795c578b1dfa9cbd25b