CVE-2026-46158
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel related to the retransmission of ADD_ADDR in the MPTCP protocol, where the socket reference (sk) was not properly released. This issue has been resolved by ensuring that the reference is always decreased at the end of the operation.
Risk Assessment
Improper socket reference management may lead to memory leaks, which can affect system stability and the security of applications running on the kernel in the long term.
Recommendation
It is recommended to update the Linux kernel to the latest version to eliminate this vulnerability and to monitor the system for potential memory issues.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(). It should then be released in all cases at the end. Some (unlikely) checks were returning directly instead of calling sock_put() to decrease the refcount. Jump to a new 'exit' label to call __sock_put() (which will become sock_put() in the next commit) to fix this potential leak. While at it, drop the '!msk' check which cannot happen because it is never reset, and explicitly mark the remaining one as "unlikely".