CVE-2023-34319

Linux: buffer overrun in netback due to unusual packet

HIGH

7.8

CVSS Score

Published: September 22, 2023 at 01:34 PM UTC

Updated: October 15, 2026 at 12:16 AM UTC

3 products affected across 3 vendorsLinux KernelDebian LinuxXen

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Severity

HIGH7.8

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

10.0

Linux Kernel · Linux

95%

4.14.302 ≤ v < 4.14.3214.19.269 ≤ v < 4.19.2904.9.336 ≤ v < 4.105.10.159 ≤ v < 5.10.1895.15.83 ≤ v < 5.15.1255.4.227 ≤ v < 5.4.2526.1.13 ≤ v < 6.1.446.2 ≤ v < 6.4.9

Affected range stops below 4.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.14.321, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.19.290, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.10.189, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.15.125, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.4.252, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.1.44, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.4.9, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in consult Xen advisory XSA-432 (unknown)

Xen · Xenwordpress-plugin

95%

v ≥ 3.2.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (7)

Third Party AdvisoryVDB Entry

Source: [email protected]

http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html

Third Party Advisory

Source: [email protected]

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

Third Party Advisory

Source: [email protected]

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

MitigationPatchVendor Advisory

Source: [email protected]

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

Source: af854a3a-2127-422b-91ae-364da2661108

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

Source: af854a3a-2127-422b-91ae-364da2661108

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

Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

https://cert-portal.siemens.com/productcert/html/ssa-398330.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHCISA-ADP

Attack Vector: LOCAL
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-787

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