CVE-2023-6560

System crash via discontiguous io_uring ring pages

Published Dec 8, 2023 · Updated Aug 2, 2024

Out-of-bounds memory access in Linux kernel io_uring allows local users to crash the system through user-supplied SQ/CQ ring memory. In __io_uaddr_map(), multi-page validation compares only the first and last pinned pages instead of verifying that every page is physically contiguous. Low-privileged local access is required to invoke IORING_SETUP_NO_MMAP with discontiguous ring pages, and the reported consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds memory access in Linux kernel io_uring allows local users to crash the system through user-supplied SQ/CQ ring memory. In __io_uaddr_map(), multi-page validation compares only the first and last pinned pages instead of verifying that every page is physically contiguous. Low-privileged local access is required to invoke IORING_SETUP_NO_MMAP with discontiguous ring pages, and the reported consequence is a system crash.

The record

CVE
CVE-2023-6560
Published
Dec 8, 2023
Updated
Aug 2, 2024
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-823, CWE-119, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Fedora Project · Fedora LinuxAffected versions are unavailable in this record.
The Linux Kernel Organization · Linux KernelAffected versions are unavailable in this record.

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-823Use of Out-of-range Pointer Offset
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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