CVE-2025-68744 bpf: Free special fields when update [lru_,]percpu_hash maps
A missing memory free in Linux kernel BPF percpu_hash maps allows local attackers to cause memory leaks and potential 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-2025-68744?
CVE-2025-68744 is a memory corruption vulnerability in Linux, published on 24 Dec 2025. 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:
bpf: Free special fields when update [lru_,]percpu_hash maps
As [lru_,]percpu_hash maps support BPF_KPTR_{REF,PERCPU}, missing calls to 'bpf_obj_free_fields()' in 'pcpu_copy_value()' could cause the memory referenced by BPF_KPTR_{REF,PERCPU} fields to be held until the map gets freed.
Fix this by calling 'bpf_obj_free_fields()' after 'copy_map_value[,_long]()' in 'pcpu_copy_value()'.
Which versions are affected by CVE-2025-68744?
How do I fix CVE-2025-68744?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-68744 being exploited?
There is no known exploitation of CVE-2025-68744 in the wild and no public exploit code.
Sources
Also known as AZL-73093, BELL-CVE-2025-68744, DEBIAN-CVE-2025-68744, GHSA-99pp-v74j-jmgv, ROOT-OS-UBUNTU-2404-CVE-2025-68744, UBUNTU-CVE-2025-68744.