Out-of-bounds write in Linux kernel - CVE-2026-64192

Vulnerability details

The vulnerability allows a local privileged user to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in BPF_MAP_TYPE_INODE_STORAGE handling when creating and updating inode storage maps while the BPF LSM is uninitialized. A local privileged user can create and update a BPF_MAP_TYPE_INODE_STORAGE map to cause a denial of service.

This issue occurs when CONFIG_BPF_LSM is enabled but the BPF LSM is not enabled at boot time, causing the inode security blob offset to remain uninitialized and leading to a kernel panic during later RCU callback execution.

Affected software

How to mitigate CVE-2026-64192

External References

• https://git.kernel.org/stable/c/a6f0643e4f63cfaa0d5d4a69de4f132eac4b8fe4
• https://git.kernel.org/stable/c/c76b8abce575e0c6e4096957220b4515ed847d89

Related Security Bulletins

• Out-of-bounds write in Linux kernel bpf
• Debian update for linux