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  4. CVE 2026 80588 mptcp reclaim forward allocated memory on rx path
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Back to active CVEs
High · CVSS 7.5CVE-2026-80588

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

Answer in brief

CVE-2026-80588 records a High severity (CVSS 7.5) 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 27, 2026Source checked Oct 10, 2026First seen by HOL Aug 26, 2026Material review Aug 27, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. 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
PackageAffected rangeFixed version
Linux/Linuxgeneric>=a84164847b1e0a106ebc46821e5d2f9b775c9dc8 <473f1a5ab2abc98dd9e74b95b9c23c66c47535cc || >=9db5b3cec4ec1c0cd3239689f5c8653d691a1754 <8277f48a06d3aa1441f6d0b6998ccc0360d30ed8 || >=9db5b3cec4ec1c0cd3239689f5c8653d691a1754 <41b49a8b914ec7dcb03eae93fb27f3c464078644 || >=6.18.35 <6.18.46473f1a5ab2abc98dd9e74b95b9c23c66c47535cc, 8277f48a06d3aa1441f6d0b6998ccc0360d30ed8, 41b49a8b914ec7dcb03eae93fb27f3c464078644, 6.18.46
Linux/Linuxgeneric6.19Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review 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

  1. Published upstream

    Aug 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 26, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
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.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 10, 2026
References
3 linked sources
Open source record