Riskcovery

CVE-2021-47152

mptcp: fix data stream corruption

State
Published
Severity
7.8 High
Published
Mar 25, 2024
Updated
Aug 5, 2026
Reserved
Mar 4, 2024

Read the record on cve.org

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)

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 18b683bff89d46ace55f12d00c0440d44d6160c4 to before 3267a061096efc91eda52c2a0c61ba76e46e4b34Affected
  • 18b683bff89d46ace55f12d00c0440d44d6160c4 to before 18e7f0580da15cac1e79d73683ada5a9e70980f8Affected
  • 18b683bff89d46ace55f12d00c0440d44d6160c4 to before 29249eac5225429b898f278230a6ca2baa1ae154Affected
LinuxLinux
  • 5.7Affected
  • before 5.7Not affected
  • 5.10.42 through 5.10.*Not affected
  • 5.12.9 through 5.12.*Not affected
  • 5.13 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.