CVE-2026-80588 PUBLISHED

In the Linux kernel, the following vulnerability has been resolved:

mptcp: reclaim forward-allocated memory on RX path errors

After commit 9db5b3cec4ec ("mptcp: borrow forward memory from subflow"), errors in the receive path prior to queueing skbs into the receive queue do not trigger forward-allocated memory reclaiming.

Prevent forward memory from growing unboundedly in pathological drop scenarios by explicitly reclaiming memory when skbs are dropped.

• https://git.kernel.org/stable/c/473f1a5ab2abc98dd9e74b95b9c23c66c47535cc
• https://git.kernel.org/stable/c/8277f48a06d3aa1441f6d0b6998ccc0360d30ed8
• https://git.kernel.org/stable/c/41b49a8b914ec7dcb03eae93fb27f3c464078644