CVE-2024-45009

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd0876b2284cf8b34dd214b2d0aa21071c345da59 < 35b31f5549ede4070566b949781e83495906b43daffected
LinuxLinuxd0876b2284cf8b34dd214b2d0aa21071c345da59 < 85b866e4c4e63a1d7afb58f1e24273caad03d0b7affected
LinuxLinuxd0876b2284cf8b34dd214b2d0aa21071c345da59 < d20bf2c96d7ffd171299b32f562f70e5bf5dc608affected
LinuxLinuxd0876b2284cf8b34dd214b2d0aa21071c345da59 < 2060f1efab370b496c4903b840844ecaff324c3caffected
LinuxLinuxd0876b2284cf8b34dd214b2d0aa21071c345da59 < 1c1f721375989579e46741f59523e39ec9b2a9bdaffected
LinuxLinux5.10affected
LinuxLinux0 < 5.10unaffected
LinuxLinux5.15.167 <= 5.15.*unaffected
LinuxLinux6.1.107 <= 6.1.*unaffected
LinuxLinux6.6.48 <= 6.6.*unaffected
LinuxLinux6.10.7 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References