CVE-2024-44974: mptcp: pm: avoid possible UaF when selecting endp

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-04 · updated 2026-08-04
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: avoid possible UaF when selecting endp select_local_address() and select_signal_address() both select an endpoint entry from the list inside an RCU protected section, but return a reference to it, to be read later on. If the entry is dereferenced after the RCU unlock, reading info could cause a Use-after-Free. A simple solution is to copy the required info while inside the RCU protected section to avoid any risk of UaF later. The address ID might need to be modified later to handle the ID0 case later, so a copy seems OK to deal with.

Affected products

Debian Linux: 11.0
Linux kernel: from 5.7 before 5.10.226; from 5.11 before 5.15.167; from 5.16 before 6.1.109; from 6.2 before 6.6.48; from 6.7 before 6.10.7; 6.11-rc1, 6.11-rc2, 6.11-rc3, 6.11-rc4 — fixed in 5.10.226, 5.15.167, 6.1.109, 6.10.7, 6.6.48

How to fix

Upgrade to a fixed version: Linux kernel 5.10.226, 5.15.167, 6.1.109, 6.10.7. Check the vendor advisory for mitigations.

References

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