CVE-2023-53669

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Source

https://cve.org/CVERecord?id=CVE-2023-53669

Import Source

JSON Data

https://api.test.osv.dev/v1/vulns/CVE-2023-53669

Downstream

Published

2025-10-07T15:21:26Z

Modified

2026-08-12T03:30:18Z

Severity

7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

tcp: fix skb_copy_ubufs() vs BIG TCP

Details

In the Linux kernel, the following vulnerability has been resolved:

tcp: fix skb_copy_ubufs() vs BIG TCP

David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy using hugepages, and skb length bigger than ~68 KB.

skb_copy_ubufs() assumed it could copy all payload using up to MAX_SKB_FRAGS order-0 pages.

This assumption broke when BIG TCP was able to put up to 512 KB per skb.

We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45 and limit gso_max_size to 180000.

A solution is to use higher order pages if needed.

v2: add missing __GFP_COMP, or we leak memory.

Database specific

{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53669.json"
}

References

Affected packages

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

7c4e983c4f3cf94fcd879730c6caa877e0768a4d

Fixed

7fa93e39fbb0566019c388a8038a4d58552e0910

Fixed

3c77a377877acbaf03cd7caa21d3644a5dd16301

Fixed

9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f

Fixed

7e692df3933628d974acb9f5b334d2b3e885e2a6

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53669.json"

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53669.json"