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CVE-2026-80588: mptcp: reclaim forward-allocated memory on RX path errors

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-10-16

Description

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.

Affected products

• Linux kernel: from 6.18.35 before 6.18.46; 6.19 — fixed in 6.18.46, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.18.46, 7.2. Check the vendor advisory for mitigations.

References

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

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