PT-2024-5927 · Linux+6 · Linux Kernel+6
Paolo Abeni
·
Published
2024-08-20
·
Updated
2025-09-29
·
CVE-2024-44974
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.6.50
Description
The issue is related to the
select local address() and select signal address() functions in the Linux kernel's mptcp component. These functions select an endpoint entry from a list inside an RCU protected section but return a reference to it, which can be read later. If the entry is dereferenced after the RCU unlock, it could cause a Use-after-Free, potentially affecting the confidentiality, integrity, and availability of protected information. A simple solution is to copy the required information while inside the RCU protected section to avoid any risk of Use-after-Free later.Recommendations
To resolve the issue, update the Linux kernel to version 6.6.50 or later. As a temporary workaround, consider modifying the
select local address() and select signal address() functions to copy the required information while inside the RCU protected section. Restrict access to the vulnerable mptcp component to minimize the risk of exploitation until a patch is available.Exploit
Fix
Use After Free
Buffer Overflow
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Related Identifiers
Affected Products
Alt Linux
Astra Linux
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu