CVE-2026-63865 bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks
Linux kernel BPF sleepable hooks incorrectly allowed non-sleepable contexts, potentially causing system instability or 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-2026-63865?
CVE-2026-63865 is a high-severity vulnerability in Linux kernel, published on 19 Jul 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:
bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks
bpf_lsm_task_to_inode() is called under rcu_read_lock() and bpf_lsm_inet_conn_established() is called from softirq context, so neither hook can be used by sleepable LSM programs.
Which versions are affected by CVE-2026-63865?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-63865?
Apply the vendor's patch.
Is CVE-2026-63865 being exploited?
There is no known exploitation of CVE-2026-63865 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-63865, DEBIAN-CVE-2026-63865, GHSA-cx6c-jx3r-hwpq, UBUNTU-CVE-2026-63865.