synced 4 MIN AGO
01 Record

CVE-2023-5215

Libnbd: crash or misbehaviour when nbd server returns an unexpected block size

MediumPUBLISHEDCNA: redhat
CNA base score5.3 CVSS v3.xCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
View raw JSON

02 Description

Libnbd: crash or misbehaviour when nbd server returns an unexpected block size

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.80% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 56.2% of scored records. A rank, not a probability.
NVD base score
6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-09-28 13:55Z3 YR AGO
Last updated
2025-11-08 08:55Z11 MO AGO
Reserved
2023-09-26
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Medium (CVSS 5.3)
CNA CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-241Improper Handling of Unexpected Data TypeBase
  • CWE-252Unchecked Return ValueBase
Data version
5.2
Document digest
efae7c73b854c967d3eb12a647cbd26cbef2b31899764ab8c1ebecca8b098e46

05 Affected products

VendorProductVersionsPlatforms
Red HatRed Hat Enterprise Linux 9Not specified—
Red HatRed Hat Enterprise Linux 8Not specified—
Red HatRed Hat Enterprise Linux 8 Advanced VirtualizationNot specified—

06 References

07 Fixed in

AlmaLinux 9

  • libnbd
    Fixed in 1.18.1-3.el9
  • libnbd-bash-completion
    Fixed in 1.18.1-3.el9
  • libnbd-devel
    Fixed in 1.18.1-3.el9
  • nbdfuse
    Fixed in 1.18.1-3.el9
  • ocaml-libnbd
    Fixed in 1.18.1-3.el9
  • ocaml-libnbd-devel
    Fixed in 1.18.1-3.el9
  • python3-libnbd
    Fixed in 1.18.1-3.el9

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • libnbd
    Fixed in 1.18.1-3.el9
  • libnbd-bash-completion
    Fixed in 1.18.1-3.el9
  • libnbd-devel
    Fixed in 1.18.1-3.el9
  • nbdfuse
    Fixed in 1.18.1-3.el9
  • ocaml-libnbd
    Fixed in 1.18.1-3.el9
  • ocaml-libnbd-devel
    Fixed in 1.18.1-3.el9
  • python3-libnbd
    Fixed in 1.18.1-3.el9

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • libnbd
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • libnbd
    Fixed in 1.16.5-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • libnbd
    Fixed in 1.16.5-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • libnbd
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • libnbd
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • libnbd
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • libnbd
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • libnbd
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • libnbd
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.