CVE-2023-53669
tcp: fix skb_copy_ubufs() vs BIG TCP
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Timeline
ID reserved
By Linux
Published
- 12 months later
· 12 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d – < 7fa93e39fbb0566019c388a8038a4d58552e0910
- affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d – < 3c77a377877acbaf03cd7caa21d3644a5dd16301
- affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d – < 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f
- affected 7c4e983c4f3cf94fcd879730c6caa877e0768a4d – < 7e692df3933628d974acb9f5b334d2b3e885e2a6
- affected 5.19
- unaffected < 5.19
- unaffected 6.1.29 – ≤ 6.1.*
- unaffected 6.2.16 – ≤ 6.2.*
- unaffected 6.3.3 – ≤ 6.3.*
- unaffected 6.4 – ≤ *
References (4)
- https://git.kernel.org/stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910 (opens in a new tab)
- https://git.kernel.org/stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301 (opens in a new tab)
- https://git.kernel.org/stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f (opens in a new tab)
- https://git.kernel.org/stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-53669)Record last updated .