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Fencer Vulns
medium 5.5

CVE-2023-6560 json

Kernel: io_uring out of boundary memory access in __io_uaddr_map()

published 2023-12-08 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58789

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

An out-of-bounds memory access flaw was found in the io_uring SQ/CQ rings functionality in the Linux kernel. This issue could allow a local user to crash the system.

Patch / fix

  • linux Debian 14, Debian 13 6.6.8-1

debian advisories DEBIAN-CVE-2023-6560

  • linux-aws-6.5 Ubuntu 22.04 LTS 6.5.0-1015.15~22.04.1
  • linux-gcp-6.5 Ubuntu 22.04 LTS 6.5.0-1015.15~22.04.1
  • linux-hwe-6.5 Ubuntu 22.04 LTS 6.5.0-25.25~22.04.1
  • linux-oem-6.5 Ubuntu 22.04 LTS 6.5.0-1016.17
  • linux-azure-6.5 Ubuntu 22.04 LTS 6.5.0-1016.16~22.04.1
  • linux-riscv-6.5 Ubuntu 22.04 LTS 6.5.0-25.25.1~22.04.1
  • linux-nvidia-6.5 Ubuntu 22.04 LTS 6.5.0-1014.14
  • linux-starfive-6.5 Ubuntu 22.04 LTS 6.5.0-1009.10~22.04.1

ubuntu advisories UBUNTU-CVE-2023-6560

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel CBL-Mariner 2.0 5.15.153.1-1

azure linux advisories AZL-32173

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-6560 updated cvss 5.5

kernel: io_uring out of boundary memory access in __io_uaddr_map()

  • Red Hat Enterprise Linux 6 perf, kernel, kernel-rt, python-perf, kernel-kdump, kernel-firmware, +2 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a kernel
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Fedora Fedora

Classification

Weakness
  • CWE-823 Use of Out-of-range Pointer Offset
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.