CVE-2023-46838: fedora Null Dereference — Fix

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.14 — 4.19.306
linux	linux_kernel	4.20 — 5.4.268
linux	linux_kernel	5.5 — 5.10.209
linux	linux_kernel	5.11 — 5.15.148
linux	linux_kernel	5.16 — 6.1.75
linux	linux_kernel	6.2 — 6.6.14
linux	linux_kernel	6.7 — 6.7.2
fedoraproject	fedora	All
fedoraproject	fedora	All
debian	debian_linux	All

References

Advisories & Patches

https://xenbits.xenproject.org/xsa/advisory-448.html https://xenbits.xenproject.org/xsa/advisory-448.html

Other References

https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html https://lists.fedoraproject.org/archives/list/[email protected]/message/RGEKT4DKSDXDS34EL7M4UVJMMPH7Z3ZZ/ https://lists.fedoraproject.org/archives/list/[email protected]/message/ZFYW6R64GPLUOXSQBJI3JBUX3HGLAYPP/ http://xenbits.xen.org/xsa/advisory-448.html https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html https://lists.fedoraproject.org/archives/list/[email protected]/message/RGEKT4DKSDXDS34EL7M4UVJMMPH7Z3ZZ/ https://lists.fedoraproject.org/archives/list/[email protected]/message/ZFYW6R64GPLUOXSQBJI3JBUX3HGLAYPP/

Frequently Asked Questions

What is CVE-2023-46838? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-46838? +

CVE-2023-46838 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2023-46838? +

CVE-2023-46838 affects products from debian, fedoraproject, linux, specifically: debian_linux, fedora, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-46838? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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