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

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.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 51 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-80588, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Received3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.34% · top 73% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

  • Linux · Linux

    • affected a84164847b1e0a106ebc46821e5d2f9b775c9dc8 – < 473f1a5ab2abc98dd9e74b95b9c23c66c47535cc
    • affected 9db5b3cec4ec1c0cd3239689f5c8653d691a1754 – < 8277f48a06d3aa1441f6d0b6998ccc0360d30ed8
    • affected 9db5b3cec4ec1c0cd3239689f5c8653d691a1754 – < 41b49a8b914ec7dcb03eae93fb27f3c464078644
    • affected 6.18.35 – < 6.18.46

  • Linux · Linux

    • affected 6.19
    • unaffected < 6.19
    • unaffected 6.18.46 – ≤ 6.18.*
    • unaffected 7.1.10 – ≤ 7.1.*
    • unaffected 7.2 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .