CVE-2023-53669
Published: Oct 7, 2025
Modified: May 11, 2026
Description
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 | Product | Versions |
|---|---|---|
Linux | Linux | affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d - < 7fa93e39fbb0566019c388a8038a4d58552e0910affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d - < 3c77a377877acbaf03cd7caa21d3644a5dd16301affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d - < 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328faffected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d - < 7e692df3933628d974acb9f5b334d2b3e885e2a6 |
Linux | Linux | affected 5.19unaffected 0 - < 5.19unaffected 6.1.29 - <= 6.1.*unaffected 6.2.16 - <= 6.2.*unaffected 6.3.3 - <= 6.3.*+1 more versions |
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