CVE-2023-53669 - tcp: fix skb_copy_ubufs() vs BIG TCP

CVE-2023-53669 - tcp: fix skb_copy_ubufs() vs BIG TCP

https://cvefeed.io/rssfeed/latest.atom / Tue, 10/07/2025 - 17:42
CVE ID : CVE-2023-53669
Published : Oct. 7, 2025, 3:21 p.m. | 21 minutes ago
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.
Severity: 0.0 | NA
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