Use-after-free in Linux kernel - CVE-2026-98366

Vulnerability details

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

The vulnerability exists due to use-after-free in the Linux kernel RDMA/rxe memory registration and cleanup code when re-registering a memory region with both protection-domain and access changes and unsupported access flags. A local user can trigger a failed re-registration followed by memory-region deregistration, protection-domain deallocation, and memory-window cleanup to cause a denial of service.

Affected software

How to mitigate CVE-2026-98366

External References

• https://git.kernel.org/stable/c/08f12745cb72981aa2cabe214af0c7a42a856f0a
• https://git.kernel.org/stable/c/4dd7a53f1c5b44693c26dac4b9b5bd5bb9d604c8
• https://git.kernel.org/stable/c/7230cc456d4bb2221c20c5f1d22b38b8576aa16f
• https://git.kernel.org/stable/c/ae36a5b609ae79f4de966328b78d2584be9719a4
• https://git.kernel.org/stable/c/fe602c91a52e161ace4afd5bdb8f33270c554c6f

Related Security Bulletins

• Use-after-free in Linux kernel sw rxe driver
• Debian update for linux