CVE-2026-74352 of: reserved_mem: avoid post-init UAF when alloc_reserved_mem_array() fails
A use-after-free vulnerability in the Linux kernel's reserved memory handling allows attackers to cause a denial of service or potentially execute code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74352?
CVE-2026-74352 is an use after free vulnerability in Linux, published on 15 Aug 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
of: reserved_mem: avoid post-init UAF when alloc_reserved_mem_array() fails
The global pointer 'reserved_mem' continues to reference the reserved_mem_array which lives in __initdata if alloc_reserved_mem_array() fails. of_reserved_mem_lookup() is exported for post-init use, that would dereference freed memory and trigger a use-after-free.
So reset reserved_mem_count to 0 when alloc_reserved_mem_array() fails.
Which versions are affected by CVE-2026-74352?
How do I fix CVE-2026-74352?
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-2026-74352 being exploited?
There is no known exploitation of CVE-2026-74352 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74352, DEBIAN-CVE-2026-74352, GHSA-9fvr-rjg6-fvw4, UBUNTU-CVE-2026-74352.