CVE-2023-53669
tcp: fix skb_copy_ubufs() vs BIG TCP
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Oct 7, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
7c4e983c4f3cf94fcd879730c6caa877e0768a4d < 7fa93e39fbb0566019c388a8038a4d58552e0910 7c4e983c4f3cf94fcd879730c6caa877e0768a4d < 3c77a377877acbaf03cd7caa21d3644a5dd16301 7c4e983c4f3cf94fcd879730c6caa877e0768a4d < 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f 7c4e983c4f3cf94fcd879730c6caa877e0768a4d < 7e692df3933628d974acb9f5b334d2b3e885e2a6
Linux / Linux
5.19
References
git.kernel.org: https://git.kernel.org/stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910 git.kernel.org: https://git.kernel.org/stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301 git.kernel.org: https://git.kernel.org/stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f git.kernel.org: https://git.kernel.org/stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6