CVE-2026-80979

Kernel memory corruption via SMC-D teardown race

Published Sep 11, 2026 · Updated Sep 11, 2026

Use-after-free in Linux net/smc allows attackers to corrupt kernel memory during affected SMC-D connection teardown. smc_conn_free leaves the connection registered while draining its receive tasklet, allowing an interrupt to re-arm the tasklet after the DMB-nocopy send buffer is freed. Reachability requires link-group teardown on the SMC-D DMB-nocopy path; the only upstream provider is a default-disabled testing aid.

CVSS severityUnavailable
Unscored
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Use-after-free in Linux net/smc allows attackers to corrupt kernel memory during affected SMC-D connection teardown. smc_conn_free leaves the connection registered while draining its receive tasklet, allowing an interrupt to re-arm the tasklet after the DMB-nocopy send buffer is freed. Reachability requires link-group teardown on the SMC-D DMB-nocopy path; the only upstream provider is a default-disabled testing aid.

The record

CVE
CVE-2026-80979
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=21f6f41e82e59740e26e06e77bdf58dc7f6f08dd
  2. Affected versionversion=6.10
  3. Affected versionversion=6.6.66 <6.7
  4. Affected versionversion=ae2be35cbed2c8385e890147ea321a3fcc3ca5fa <36cdf5d48ca191dcd71c28cadbe0981b1d25318d
  5. Affected versionversion=ae2be35cbed2c8385e890147ea321a3fcc3ca5fa <5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3
  6. Affected versionversion=ae2be35cbed2c8385e890147ea321a3fcc3ca5fa <b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5
  7. Affected versionversion=ae2be35cbed2c8385e890147ea321a3fcc3ca5fa <b74d313567dfc1b7e56629ddbad04e728686f235

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=21f6f41e82e59740e26e06e77bdf58dc7f6f08dd; version=6.10; version=6.6.66 <6.7; version=ae2be35cbed2c8385e890147ea321a3fcc3ca5fa <36cdf5d48ca191dcd71c28cadbe0981b1d25318d; version=ae2be35cbed2c8385e890147ea321a3fcc3ca5fa <5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3; version=ae2be35cbed2c8385e890147ea321a3fcc3ca5fa <b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5; version=ae2be35cbed2c8385e890147ea321a3fcc3ca5fa <b74d313567dfc1b7e56629ddbad04e728686f235

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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