CVE-2026-80846Network attack vectorHinoki check available

Kernel fault via stale ESP-in-TCP ingress device

Published Sep 4, 2026 · Updated Sep 4, 2026

NULL-pointer dereference in affected Linux kernel releases allows attackers to trigger a kernel fault via queued ESP-in-TCP data. The handle_esp() path restores skb->dev from a saved interface index without rejecting a failed dev_get_by_index_rcu() lookup before route construction. The trigger requires queued ESP-in-TCP data to outlive ingress-device removal, such as veth or network-namespace teardown.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL-pointer dereference in affected Linux kernel releases allows attackers to trigger a kernel fault via queued ESP-in-TCP data. The handle_esp() path restores skb->dev from a saved interface index without rejecting a failed dev_get_by_index_rcu() lookup before route construction. The trigger requires queued ESP-in-TCP data to outlive ingress-device removal, such as veth or network-namespace teardown.

The record

CVE
CVE-2026-80846
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=5.6
  2. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <239d0f71af09dc2029fd4d730cb24b8c83aaa43a
  3. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <2dd1609cadff46c4b20ce53b91ab9cce1380456a
  4. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <328e40aa774b446969c69b654c52a051a95af8a1
  5. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <6af5cdb03819a5ce6e945992635c6c5e91045367
  6. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <7911e0236616487b89db6bd3ba3f408abd10eb23
  7. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <943d95233b8b4a88994e244fcf466f8c403d63f1
  8. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <c296d25efbc840be24de83f56d43bc47e714ace9
  9. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <e1d7c5ac1c246ce5775f604515de0a59fbf2116e
  10. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <f00235f9d12301183d61f75fbe4105506f3e5140

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <239d0f71af09dc2029fd4d730cb24b8c83aaa43a; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <2dd1609cadff46c4b20ce53b91ab9cce1380456a; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <328e40aa774b446969c69b654c52a051a95af8a1; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <6af5cdb03819a5ce6e945992635c6c5e91045367; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <7911e0236616487b89db6bd3ba3f408abd10eb23; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <943d95233b8b4a88994e244fcf466f8c403d63f1; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <c296d25efbc840be24de83f56d43bc47e714ace9; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <e1d7c5ac1c246ce5775f604515de0a59fbf2116e; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <f00235f9d12301183d61f75fbe4105506f3e5140

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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