CVE-2024-45009

mptcp: pm: only decrement add_addr_accepted for MPJ req

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: only decrement add_addr_accepted for MPJ req Adding the following warning ... WARN_ON_ONCE(msk->pm.add_addr_accepted == 0) ... before decrementing the add_addr_accepted counter helped to find a bug when running the "remove single subflow" subtest from the mptcp_join.sh selftest. Removing a 'subflow' endpoint will first trigger a RM_ADDR, then the subflow closure. Before this patch, and upon the reception of the RM_ADDR, the other peer will then try to decrement this add_addr_accepted. That's not correct because the attached subflows have not been created upon the reception of an ADD_ADDR. A way to solve that is to decrement the counter only if the attached subflow was an MP_JOIN to a remote id that was not 0, and initiated by the host receiving the RM_ADDR.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.06%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/35b31f5549ede4070566b949781e83495906b43d	patch
https://git.kernel.org/stable/c/85b866e4c4e63a1d7afb58f1e24273caad03d0b7	patch
https://git.kernel.org/stable/c/d20bf2c96d7ffd171299b32f562f70e5bf5dc608	patch
https://git.kernel.org/stable/c/2060f1efab370b496c4903b840844ecaff324c3c	patch
https://git.kernel.org/stable/c/1c1f721375989579e46741f59523e39ec9b2a9bd	patch

Frequently Asked Questions

What is the severity of CVE-2024-45009?: CVE-2024-45009 has been scored as a medium severity vulnerability.
How to fix CVE-2024-45009?: To fix CVE-2024-45009, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-45009 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-45009 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-45009?: CVE-2024-45009 affects Linux Linux, Linux Linux.

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.