CVE-2021-47152
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47152
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47152.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-47152
- Downstream
- Published
- 2024-03-25T09:15:09Z
- Modified
- 2025-08-09T20:01:28Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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 'mptcpfragcancollapseto()' 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 mptcpdatafrag.
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)
- References