CVE-2026-80983

Service disruption via leaked SMC socket reference

Published Sep 11, 2026 · Updated Sep 11, 2026

Resource leak in net/smc in affected Linux kernel versions allows attackers to block network namespace teardown during SMC link failover. The smc_switch_conns() early error path returns after smc_cdc_get_free_slot() fails without matching sock_hold() with sock_put(). The path requires target-link loss or concurrent connection termination during failover; retained sockets and buffers persist indefinitely.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in net/smc in affected Linux kernel versions allows attackers to block network namespace teardown during SMC link failover. The smc_switch_conns() early error path returns after smc_cdc_get_free_slot() fails without matching sock_hold() with sock_put(). The path requires target-link loss or concurrent connection termination during failover; retained sockets and buffers persist indefinitely.

The record

CVE
CVE-2026-80983
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=0d9ddf515cde793841f738490037560fd6559c63
  2. Affected versionversion=5.10.90 <5.11
  3. Affected versionversion=5.14.14 <5.15
  4. Affected versionversion=5.15
  5. Affected versionversion=95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a <719296c4aa8213d4ac8002e77d5956d436bc98d0
  6. Affected versionversion=95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a <84dea0585f6b538ae895a8b1d025f4897737f3b1
  7. Affected versionversion=95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a <d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d
  8. Affected versionversion=95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a <d9a879ac25958bdaecb669ce70e58f8e2ff170de
  9. Affected versionversion=99f19566b1c4d3dc4d934ee2ef43faadebb56d70

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=0d9ddf515cde793841f738490037560fd6559c63; version=5.10.90 <5.11; version=5.14.14 <5.15; version=5.15; version=95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a <719296c4aa8213d4ac8002e77d5956d436bc98d0; version=95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a <84dea0585f6b538ae895a8b1d025f4897737f3b1; version=95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a <d89dc1bd8845c669a700eee58c64ebd3cc1b6d2d; version=95f7f3e7dc6bd2e735cb5de11734ea2222b1e05a <d9a879ac25958bdaecb669ce70e58f8e2ff170de; version=99f19566b1c4d3dc4d934ee2ef43faadebb56d70

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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Your stack

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