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CVE-2023-53669

18
FAUCET Score

CVE-2023-53669 is a medium-severity vulnerability in the Linux kernel's TCP implementation, specifically affecting the skb_copy_ubufs() function when handling large TCP packets (BIG TCP) with hugepages. This flaw could lead to system crashes due to incorrect assumptions about buffer sizing. The vulnerability has a CVSS score of 5.5 (MEDIUM) with a potential impact of high availability loss (A:H), requiring local access (AV:L) and low privileges (PR:L). There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.19, < 6.1.29CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.2, < 6.2.16CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.3, < 6.3.3CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.14%
Probability of exploitation in next 30 days
EPSS Percentile
3.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0014 is in the 22nd percentile among its peer group of 15,940 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-0:5.14.0-362.8.1.el9_3
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-rt

Vendor Advisories (1)

redhatCVE-2023-53669Moderate

kernel: tcp: fix skb_copy_ubufs() vs BIG TCP

Oct 7, 2025

References

git.kernel.org / stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301
Patch
git.kernel.org / stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6
Patch
git.kernel.org / stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910
Patch
git.kernel.org / stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f
Patch