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".

A flaw was found in the Linux kernel's Multipath TCP (MPTCP) implementation. When an ADD_ADDR message is retransmitted, a socket reference count may not be properly decreased, leading to a potential resource leak. Over time, this resource exhaustion could allow a remote attacker to cause a Denial of Service (DoS) by consuming system resources.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Affected kernel Red Hat Enterprise Linux 8 Affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-46158 https://nvd.nist.gov/vuln/detail/CVE-2026-46158 https://lore.kernel.org/linux-cve-announce/2026052824-CVE-2026-46158-af10@gregkh/T