CVE-2023-2598 — A flaw was found in the fixed buffer registration code for io_uring (io_sqe_buff

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / Kernel	Kernel prior to 6.4-rc1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-06-01T00:00:00.000Z
• Last modified: 2025-04-23T16:21:25.896Z

09References

• www.openwall.com — https://www.openwall.com/lists/oss-security/2023/05/08/3
• security.netapp.com — https://security.netapp.com/advisory/ntap-20230703-0006/
• www.openwall.com — http://www.openwall.com/lists/oss-security/2024/04/24/3