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🛡️ CVE-2023-46838 — debian-linux

🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-476 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Transmit requests in Xen's virtual network protocol can consist of

multiple parts. While not really useful, except for the initial part

any of them may be of zero length, i.e. carry no data at all. Besides a

certain initial portion of the to be transferred data, these parts are

directly translated into what Linux calls SKB fragments. Such converted

request parts can, when for a particular SKB they are all of length

zero, lead to a de-reference of NULL in core networking code.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2023-46838 is classified as CWE-476: NULL Pointer Dereference. A pointer that can be null is used without a check, crashing the process.

Affected software

CVE-2023-46838 is recorded against 3 packages.

  • debian-linux
  • fedora
  • linux-kernel (from 6.7 up to 6.7.2)

Timeline and source

Published on 29 January 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

lists.debian.org
lists.debian.org
lists.fedoraproject.org
lists.fedoraproject.org
xenbits.xenproject.org
xenbits.xen.org
lists.debian.org
lists.debian.org
lists.fedoraproject.org
lists.fedoraproject.org
xenbits.xenproject.org

Other advisories for this package

debian-linux has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-476: NULL Pointer Dereference) in other software:

CVE-2023-46838 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-476
Public Exploit ✅ No
Source NVD
Published 2024-01-29
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
debian-linux — —
fedora — —
linux-kernel 6.7 6.7.2

References

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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