CVE-2026-90108

Memory leakage via overwritten link-control queue entry

Published Sep 17, 2026 · Updated Sep 17, 2026

Memory leakage in net/smc in Linux kernel 5.16 allows attackers to consume kernel memory via SMC link-control messages. The smc_llc_event_handler() function overwrites a stashed flow->qentry without freeing it when REQ_ADD_LINK transitions to ADD_LINK. Triggering requires CONFIRM_LINK or ADD_LINK_CONT followed by ADD_LINK during that flow state; each transition loses one allocation, and the upstream notice does not establish a specific crash or hang.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in net/smc in Linux kernel 5.16 allows attackers to consume kernel memory via SMC link-control messages. The smc_llc_event_handler() function overwrites a stashed flow->qentry without freeing it when REQ_ADD_LINK transitions to ADD_LINK. Triggering requires CONFIRM_LINK or ADD_LINK_CONT followed by ADD_LINK during that flow state; each transition loses one allocation, and the upstream notice does not establish a specific crash or hang.

The record

CVE
CVE-2026-90108
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-772, T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

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

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.7Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
5.6TenableAV:L/AC:L/Au:N/C:N/I:P/A:C
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5TenableCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H/E:U/RL:U/RC:C
7.1TenableCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

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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