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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.

PUBLISHED Reserved 2025-10-07 | Published 2025-10-07 | Updated 2025-10-07 | Assigner Linux

Product status

Default status
unaffected

7c4e983c4f3cf94fcd879730c6caa877e0768a4d before 7fa93e39fbb0566019c388a8038a4d58552e0910
affected

7c4e983c4f3cf94fcd879730c6caa877e0768a4d before 3c77a377877acbaf03cd7caa21d3644a5dd16301
affected

7c4e983c4f3cf94fcd879730c6caa877e0768a4d before 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f
affected

7c4e983c4f3cf94fcd879730c6caa877e0768a4d before 7e692df3933628d974acb9f5b334d2b3e885e2a6
affected

Default status
affected

5.19
affected

Any version before 5.19
unaffected

6.1.29
unaffected

6.2.16
unaffected

6.3.3
unaffected

6.4
unaffected

References

git.kernel.org/...c/7fa93e39fbb0566019c388a8038a4d58552e0910

git.kernel.org/...c/3c77a377877acbaf03cd7caa21d3644a5dd16301

git.kernel.org/...c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f

git.kernel.org/...c/7e692df3933628d974acb9f5b334d2b3e885e2a6

cve.org (CVE-2023-53669)

nvd.nist.gov (CVE-2023-53669)

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