CVE-2025-37963 arm64: bpf: Only mitigate cBPF programs loaded by unprivileged users
The Linux kernel incorrectly applied BHB mitigations to privileged cBPF programs, allowing potential bypass of Spectre-BHB protections for unprivileged users.
- 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-2025-37963?
CVE-2025-37963 is a medium-severity vulnerability in Debian Debian Linux, published on 20 May 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:
arm64: bpf: Only mitigate cBPF programs loaded by unprivileged users
Support for eBPF programs loaded by unprivileged users is typically disabled. This means only cBPF programs need to be mitigated for BHB.
In addition, only mitigate cBPF programs that were loaded by an unprivileged user. Privileged users can also load the same program via eBPF, making the mitigation pointless.
Which versions are affected by CVE-2025-37963?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-37963?
Apply the vendor's patch.
Is CVE-2025-37963 being exploited?
There is no known exploitation of CVE-2025-37963 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2025-37963, DEBIAN-CVE-2025-37963, GHSA-v8x8-x32m-fh4m, ROOT-OS-DEBIAN-11-CVE-2025-37963, ROOT-OS-DEBIAN-12-CVE-2025-37963, ROOT-OS-UBUNTU-2204-CVE-2025-37963 and 2 more.