CVE-2023-46838
Linux: netback processing of zero-length transmit fragment
- State
- Published
- Severity
- 7.5 High
- Published
- Jan 29, 2024
- Updated
- Nov 4, 2025
- Reserved
- Oct 27, 2023
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-476 NULL Pointer Dereference
Affected Products
| Product | Versions |
|---|---|
LinuxLinux |
|
References
- https://xenbits.xenproject.org/xsa/advisory-448.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZFYW6R64GPLUOXSQBJI3JBUX3HGLAYPP/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGEKT4DKSDXDS34EL7M4UVJMMPH7Z3ZZ/
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- http://xenbits.xen.org/xsa/advisory-448.html
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