CVE-2021-47152
mptcp: fix data stream corruption
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix data stream corruption Maxim reported several issues when forcing a TCP transparent proxy to use the MPTCP protocol for the inbound connections. He also provided a clean reproducer. The problem boils down to 'mptcp_frag_can_collapse_to()' assuming that only MPTCP will use the given page_frag. If others - e.g. the plain TCP protocol - allocate page fragments, we can end-up re-using already allocated memory for mptcp_data_frag. Fix the issue ensuring that the to-be-expanded data fragment is located at the current page frag end. v1 -> v2: - added missing fixes tag (Mat)
Timeline
ID reserved
By Linux
- 21 days later
· 21 days later
Published
- 2 years later
· 2 years 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)
- 0.24% · top 84% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected 18b683bff89d46ace55f12d00c0440d44d6160c4 – < 3267a061096efc91eda52c2a0c61ba76e46e4b34
- affected 18b683bff89d46ace55f12d00c0440d44d6160c4 – < 18e7f0580da15cac1e79d73683ada5a9e70980f8
- affected 18b683bff89d46ace55f12d00c0440d44d6160c4 – < 29249eac5225429b898f278230a6ca2baa1ae154
- affected 5.7
- unaffected < 5.7
- unaffected 5.10.42 – ≤ 5.10.*
- unaffected 5.12.9 – ≤ 5.12.*
- unaffected 5.13 – ≤ *
References (3)
- https://git.kernel.org/stable/c/3267a061096efc91eda52c2a0c61ba76e46e4b34 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/18e7f0580da15cac1e79d73683ada5a9e70980f8 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/29249eac5225429b898f278230a6ca2baa1ae154 (opens in a new tab)x_transferred
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-2021-47152)Record last updated .