# CVE-2021-47152: linux: In the Linux kernel, the following vulnerability has been resolved:  mptcp: fix data stream corruption  Maxim reporte...

CVE-2021-47152 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47152, released March 25, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47152
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2024

## 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)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47152](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47152.md) | Mar 25, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47152](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47152.md) | Mar 25, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47152](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47152.md) | Mar 25, 2024 |

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