CVE-2026-97524

Kernel hang via recursive MPTCP data locking

Published Sep 25, 2026 · Updated Sep 25, 2026

Improper locking in Linux MPTCP allows attackers to hang kernel networking when exceptional receive errors reset a subflow. The receive path can reenter mptcp_data_ready through subflow_state_change and reacquire the MPTCP data lock that it already holds, creating a deadlock; reset processing can also revisit an skb after freeing it. Triggering the condition requires an MPTCP subflow reset during the rare error path, and the documented consequence is stalled receive processing rather than data disclosure or modification.

CVSS severityUnavailable
Unscored
EPSS probability0.69%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux MPTCP allows attackers to hang kernel networking when exceptional receive errors reset a subflow. The receive path can reenter mptcp_data_ready through subflow_state_change and reacquire the MPTCP data lock that it already holds, creating a deadlock; reset processing can also revisit an skb after freeing it. Triggering the condition requires an MPTCP subflow reset during the rare error path, and the documented consequence is stalled receive processing rather than data disclosure or modification.

The record

CVE
CVE-2026-97524
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12c1676d598e3b8dd92a033b623b792cc2ea1ec5
  2. Affected versionversion=35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25
  3. Affected versionversion=5.10.228 <5.11
  4. Affected versionversion=5.15.169 <5.16
  5. Affected versionversion=6.1.113 <6.2
  6. Affected versionversion=6.11.4 <6.12
  7. Affected versionversion=6.12
  8. Affected versionversion=6.6.57 <6.7
  9. Affected versionversion=8bfd391bde685df7289b928ce8876a3583be4bfb
  10. Affected versionversion=b8be15d1ae7ea4eedd547c3b3141f592fbddcd30
  11. Affected versionversion=e32d262c89e2b22cb0640223f953b548617ed8a6 <2b0f561f21b27c40c91ea4975268a06092bd7e9c
  12. Affected versionversion=e32d262c89e2b22cb0640223f953b548617ed8a6 <4b7abdcb5ba832fafab679f0d998af39cbc99307
  13. Affected versionversion=e32d262c89e2b22cb0640223f953b548617ed8a6 <b2dbcc1ed48b5ac070a41db4a52aade6823c4df0
  14. Affected versionversion=e32d262c89e2b22cb0640223f953b548617ed8a6 <ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f
  15. Affected versionversion=fde99e972b8f88cebe619241d7aa43d288ef666a

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=12c1676d598e3b8dd92a033b623b792cc2ea1ec5; version=35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25; version=5.10.228 <5.11; version=5.15.169 <5.16; version=6.1.113 <6.2; version=6.11.4 <6.12; version=6.12; version=6.6.57 <6.7; version=8bfd391bde685df7289b928ce8876a3583be4bfb; version=b8be15d1ae7ea4eedd547c3b3141f592fbddcd30; version=e32d262c89e2b22cb0640223f953b548617ed8a6 <2b0f561f21b27c40c91ea4975268a06092bd7e9c; version=e32d262c89e2b22cb0640223f953b548617ed8a6 <4b7abdcb5ba832fafab679f0d998af39cbc99307; version=e32d262c89e2b22cb0640223f953b548617ed8a6 <b2dbcc1ed48b5ac070a41db4a52aade6823c4df0; version=e32d262c89e2b22cb0640223f953b548617ed8a6 <ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f; version=fde99e972b8f88cebe619241d7aa43d288ef666a

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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