Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2023-53669

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
07/10/2025
Last modified:
03/02/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tcp: fix skb_copy_ubufs() vs BIG TCP<br /> <br /> David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy<br /> using hugepages, and skb length bigger than ~68 KB.<br /> <br /> skb_copy_ubufs() assumed it could copy all payload using up to<br /> MAX_SKB_FRAGS order-0 pages.<br /> <br /> This assumption broke when BIG TCP was able to put up to 512 KB per skb.<br /> <br /> We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45<br /> and limit gso_max_size to 180000.<br /> <br /> A solution is to use higher order pages if needed.<br /> <br /> v2: add missing __GFP_COMP, or we leak memory.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.19 (including) 6.1.29 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.2.16 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.3 (including) 6.3.3 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools