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CVE-2026-80588

mptcp: reclaim forward-allocated memory on RX path errors

HIGH
7.5
CVSS Score
Published: August 26, 2026 at 02:37 PM UTC
Updated: October 16, 2026 at 08:18 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
6.18.356.199db5b3cec4ec1c0cd3239689f5c8653d691a1754a84164847b1e0a106ebc46821e5d2f9b775c9dc8
Vendor states this is fixed in 41b49a8b914ec7dcb03eae93fb27f3c464078644 (fixed)
Vendor states this is fixed in 473f1a5ab2abc98dd9e74b95b9c23c66c47535cc (fixed)
Vendor states this is fixed in 8277f48a06d3aa1441f6d0b6998ccc0360d30ed8 (fixed)
Vendor states this is fixed in 6.18.46 (unaffected)
Vendor states this is fixed in 6.19 (unaffected)
Vendor states this is fixed in 7.1.10 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHLinux
Vector?

Quick Info

StatusRECEIVED

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