PT-2024-11201 · Linux · Linux Kernel

Maxim Galaganov · Published 2021-05-11 · Updated 2024-03-25 · CVE-2021-47152

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to the MPTCP protocol in the Linux kernel, where the mptcp frag can collapse to() function assumes that only MPTCP will use the given page frag. However, if other protocols, such as plain TCP, allocate page fragments, it can lead to re-using already allocated memory for mptcp data frag. This can cause data stream corruption when forcing a TCP transparent proxy to use the MPTCP protocol for inbound connections.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2025-13699

CVE-2021-47152

Affected Products

Linux Kernel

References · 17

• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47152 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-13699 · Security Note
• https://git.kernel.org/stable/c/3267a061096efc91eda52c2a0c61ba76e46e4b34 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47152 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-47152 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47152 · Vendor Advisory
• https://git.kernel.org/stable/c/29249eac5225429b898f278230a6ca2baa1ae154 · Patch
• https://osv.dev/vulnerability/CVE-2021-47152 · Vendor Advisory
• https://git.kernel.org/stable/c/18e7f0580da15cac1e79d73683ada5a9e70980f8 · Patch
• https://ubuntu.com/security/CVE-2021-47152 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-47152 · Security Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.9 · Note
• https://twitter.com/CVEnew/status/1772190595575951836 · Twitter Post
• https://lore.kernel.org/linux-cve-announce/2024032500-CVE-2021-47152-a386@gregkh · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.42 · Note