mptcp: reclaim forward-allocated memory on RX path errors (CVE-2026-80588) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80588

mptcp: reclaim forward-allocated memory on RX path errors

Answer in brief

CVE-2026-80588 records a Unknown severity vulnerability in mptcp: reclaim forward-allocated memory on RX path errors. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=a84164847b1e0a106ebc46821e5d2f9b775c9dc8 <473f1a5ab2abc98dd9e74b95b9c23c66c47535cc \|\| >=9db5b3cec4ec1c0cd3239689f5c8653d691a1754 <8277f48a06d3aa1441f6d0b6998ccc0360d30ed8 \|\| >=9db5b3cec4ec1c0cd3239689f5c8653d691a1754 <41b49a8b914ec7dcb03eae93fb27f3c464078644 \|\| >=6.18.35 <6.18.46	473f1a5ab2abc98dd9e74b95b9c23c66c47535cc, 8277f48a06d3aa1441f6d0b6998ccc0360d30ed8, 41b49a8b914ec7dcb03eae93fb27f3c464078644, 6.18.46
Linux/Linuxgeneric	6.19	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 473f1a5ab2abc98dd9e74b95b9c23c66c47535cc if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.