CVE-2026-92489Network attack vector

Kernel memory corruption via XFRM skb double-free

Published Sep 17, 2026 · Updated Sep 18, 2026

A double-free in the Linux kernel's XFRM output path allows remote attackers to corrupt kernel memory through forwarded IP packets. xfrm_dev_direct_output() frees an skb after local_out() has already consumed it or transferred ownership following a netfilter DROP, QUEUE, or STOLEN verdict. An IPsec packet-offload tunnel SA must already be configured; exploitation can expose or alter kernel memory or panic the host.

CVSS severity9.8
Critical
EPSS probability0.46%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A double-free in the Linux kernel's XFRM output path allows remote attackers to corrupt kernel memory through forwarded IP packets. xfrm_dev_direct_output() frees an skb after local_out() has already consumed it or transferred ownership following a netfilter DROP, QUEUE, or STOLEN verdict. An IPsec packet-offload tunnel SA must already be configured; exploitation can expose or alter kernel memory or panic the host.

The record

CVE
CVE-2026-92489
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5eddd76ec2fd1988f0a3450fde9730b10dd22992 <02deb637e965950148752a304dd1471212dd6470
  2. Affected versionversion=5eddd76ec2fd1988f0a3450fde9730b10dd22992 <2aed51fc58d9ce450e2c116efb956160fd06fa02
  3. Affected versionversion=5eddd76ec2fd1988f0a3450fde9730b10dd22992 <56a347950e661c1a7f8f31c43a2ea53c2323b6f4
  4. Affected versionversion=6.12.21 <6.12.110
  5. Affected versionversion=6.13.9 <6.14
  6. Affected versionversion=6.14
  7. Affected versionversion=6.6.85 <6.6.157
  8. Affected versionversion=a0395e96831adee8ffa016bf958e4dce9ece656e <bc9297796bfdcc8d9609236e54519a4f38737aac
  9. Affected versionversion=bfb9b9404a53a72524ce695551755117e9d3deb0 <621871b696b108026bf4b44ed4085ffa2102f417
  10. Affected versionversion=d1d673a5bede3767252cff19c0ab1e5387c6f43f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5eddd76ec2fd1988f0a3450fde9730b10dd22992 <02deb637e965950148752a304dd1471212dd6470; version=5eddd76ec2fd1988f0a3450fde9730b10dd22992 <2aed51fc58d9ce450e2c116efb956160fd06fa02; version=5eddd76ec2fd1988f0a3450fde9730b10dd22992 <56a347950e661c1a7f8f31c43a2ea53c2323b6f4; version=6.12.21 <6.12.110; version=6.13.9 <6.14; version=6.14; version=6.6.85 <6.6.157; version=a0395e96831adee8ffa016bf958e4dce9ece656e <bc9297796bfdcc8d9609236e54519a4f38737aac; version=bfb9b9404a53a72524ce695551755117e9d3deb0 <621871b696b108026bf4b44ed4085ffa2102f417; version=d1d673a5bede3767252cff19c0ab1e5387c6f43f

Published CVSS scores

9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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