🛡️ CVE-2023-34319
🟠 CVSS 7.8 — High ✅ No Known Exploit CWE-787 NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.

Details

Severity HIGH
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-787
Public Exploit ✅ No
Source NVD
Published 2023-09-22
Updated 2026-06-08
Modified 2025-11-04

Affected Packages

Software From version Fixed in
debian-linux — —
linux-kernel 6.2 6.4.9
xen 3.2.0 —

References

Mitigation, Patch, Vendor Advisory https://xenbits.xenproject.org/xsa/advisory-432.html
Mitigation, Patch, Vendor Advisory https://xenbits.xenproject.org/xsa/advisory-432.html

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