🛡️ CVE-2023-34319 — debian-linux

🟠 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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2023-34319 is classified as CWE-787: Out-of-bounds Write. Data is written past the end or before the start of a buffer, corrupting whatever is stored there.

Affected software

CVE-2023-34319 is recorded against 3 packages.

debian-linux
linux-kernel (from 6.2 up to 6.4.9)
xen (from 3.2.0)

Timeline and source

Published on 22 September 2023 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

packetstormsecurity.com
lists.debian.org
security.netapp.com
xenbits.xenproject.org
packetstormsecurity.com
xenbits.xen.org
lists.debian.org
lists.debian.org
security.netapp.com
xenbits.xenproject.org

CVE-2023-34319 on other distributions

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

Alpine Debian Ubuntu

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 2026-08-11

Modified 2026-06-17

Fix URL https://xenbits.xenproject.org/xsa/advisory-432.html

Affected Packages

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

References

Third Party Advisory, VDB Entry http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html

Third Party Advisory https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html

Third Party Advisory https://security.netapp.com/advisory/ntap-20240202-0001/

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

Third Party Advisory, VDB Entry http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html

http://xenbits.xen.org/xsa/advisory-432.html

https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html

Third Party Advisory https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html

Third Party Advisory https://security.netapp.com/advisory/ntap-20240202-0001/

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

🔗 NVD 🔗 Mitre ✅ Fix / Advisory

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