Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d before 7fa93e39fbb0566019c388a8038a4d58552e0910; affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d before 3c77a377877acbaf03cd7caa21d3644a5dd16301; affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d before 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f; affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d before 7e692df3933628d974acb9f5b334d2b3e885e2a6 |
| Linux / Linux | affected 5.19; unaffected 0 before 5.19; unaffected 6.1.29 through 6.1.*; unaffected 6.2.16 through 6.2.*; unaffected 6.3.3 through 6.3.*; unaffected 6.4 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910
- https://git.kernel.org/stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301
- https://git.kernel.org/stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f
- https://git.kernel.org/stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6
ADP enrichment
No English description supplied.
No references supplied.