CVE-2025-68355 bpf: Fix exclusive map memory leak
A memory leak in the Linux kernel BPF subsystem allows local attackers to exhaust system memory, causing 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-2025-68355?
CVE-2025-68355 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: Fix exclusive map memory leak
When excl_prog_hash is 0 and excl_prog_hash_size is non-zero, the map also needs to be freed. Otherwise, the map memory will not be reclaimed, just like the memory leak problem reported by syzbot [1].
syzbot reported: BUG: memory leak backtrace (crc 7b9fb9b4): map_create+0x322/0x11e0 kernel/bpf/syscall.c:1512 __sys_bpf+0x3556/0x3610 kernel/bpf/syscall.c:6131
Which versions are affected by CVE-2025-68355?
How do I fix CVE-2025-68355?
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-2025-68355 being exploited?
There is no known exploitation of CVE-2025-68355 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68355, GHSA-j3fw-w5gf-rpg8, UBUNTU-CVE-2025-68355.