CVE-2023-53669 (GCVE-0-2023-53669)

Vulnerability from cvelistv5 – Published: 2025-10-07 15:21 – Updated: 2026-10-15 21:41
VLAI
Title
tcp: fix skb_copy_ubufs() vs BIG TCP
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:36 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7c4e983c4f3cf94fcd879730c6caa877e0768a4d , < 7fa93e39fbb0566019c388a8038a4d58552e0910 (git)
Affected: 7c4e983c4f3cf94fcd879730c6caa877e0768a4d , < 3c77a377877acbaf03cd7caa21d3644a5dd16301 (git)
Affected: 7c4e983c4f3cf94fcd879730c6caa877e0768a4d , < 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f (git)
Affected: 7c4e983c4f3cf94fcd879730c6caa877e0768a4d , < 7e692df3933628d974acb9f5b334d2b3e885e2a6 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.29 , ≤ 6.1.* (semver)
Unaffected: 6.2.16 , ≤ 6.2.* (semver)
Unaffected: 6.3.3 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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