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Fencer Vulns
medium 5.5

CVE-2023-2430 json

A vulnerability was found due to missing lock for IOPOLL flaw in io_cqring_event_overflow() in io_uring.c in Linux Kernel.

published 2023-07-23 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-33916

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

A vulnerability was found due to missing lock for IOPOLL flaw in io_cqring_event_overflow() in io_uring.c in Linux Kernel. This flaw allows a local attacker with user privilege to trigger a Denial of Service threat.

Patch / fix

  • linux linux_kernel 6.2
  • linux Debian 12 6.1.52-1
  • linux Debian 14, Debian 13 6.3.7-1

debian advisories DEBIAN-CVE-2023-2430

  • linux-oem-6.0 Ubuntu 22.04 LTS 6.0.0-1019.19
  • linux-oem-6.1 Ubuntu 22.04 LTS 6.1.0-1015.15
  • linux-aws-5.19 Ubuntu 22.04 LTS 5.19.0-1028.29~22.04.1
  • linux-gcp-5.19 Ubuntu 22.04 LTS 5.19.0-1027.29~22.04.1
  • linux-hwe-5.19 Ubuntu 22.04 LTS 5.19.0-46.47~22.04.1
  • linux-riscv-5.19 Ubuntu 22.04 LTS 5.19.0-1021.23~22.04.1
  • linux-starfive-5.19 Ubuntu 22.04 LTS 5.19.0-1020.22~22.04.1
  • linux-allwinner-5.19 Ubuntu 22.04 LTS 5.19.0-1015.15~22.04.1

ubuntu advisories UBUNTU-CVE-2023-2430

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-rt Real Time Module 15 SP5, openSUSE Leap 15.5 5.14.21-150500.13.11.1
  • kernel-syms-rt Real Time Module 15 SP5, openSUSE Leap 15.5 5.14.21-150500.13.11.1
  • kernel-rt_debug Real Time Module 15 SP5, openSUSE Leap 15.5 5.14.21-150500.13.11.1
  • kernel-source-rt Real Time Module 15 SP5, openSUSE Leap 15.5 5.14.21-150500.13.11.1
  • kernel-azure SLE Module for Public Cloud 15 SP5, openSUSE Leap 15.5 5.14.21-150500.33.6.1
  • kernel-syms-azure SLE Module for Public Cloud 15 SP5, openSUSE Leap 15.5 5.14.21-150500.33.6.1
  • kernel-source-azure SLE Module for Public Cloud 15 SP5, openSUSE Leap 15.5 5.14.21-150500.33.6.1
  • dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.7.1

suse advisories SUSE-SU-2023:3302-1SUSE-SU-2023:2892-1SUSE-SU-2023:2871-1

  • kernel CBL-Mariner 2.0 5.15.137.1-1

azure linux advisories AZL-27759

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-2023-2430 updated cvss 6.6

kernel: missing lock in io_uring/msg_ring.c for IOPOLL in io_uring cause denial of service

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 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
CNA 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

Classification

Weakness
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.